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Part 3</a></p></header><div class="excerpt"><p>Engineering Mechanics MCQ Objective Question and Answers Part 3
Engineering Mechanics Multiple Choice Questions / Objectives Mechanical Questions and Answers   Engineering Mechanics MCQ  :...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/engineering-mechanics-mcq-objective-question-and-answers-part-3/" aria-label="View Post: Engineering Mechanics MCQ Objective Question and Answers Part 3">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Engineering Mechanics MCQ Objective Question and Answers Part 3","url":"\/\/www.gunkrazy.com\/engineering-mechanics-mcq-objective-question-and-answers-part-3\/","articleBody":"Engineering Mechanics MCQ Objective Question and Answers Part 3\r\nEngineering Mechanics Multiple Choice Questions \/ Objectives Mechanical Questions and Answers\u00a0\r\n\r\n\r\n\r\n\r\nEngineering Mechanics MCQ\u00a0 : Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n63. If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be\r\n(a) maximum \u00a0 \u00a0 \u00a0\r\n(b) minimum\r\n(c) zero \r\n(d) infinity\r\n(e) same as the force applied.\r\nAns: c\r\n\r\n65. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, - ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be\r\n(a) \u00a0 \u00a0 20 kg, - ve sense\r\n(b) \u00a0 \u00a0 20 kg, + ve sense\r\n(c) 10 kg, + ve sense\r\n(d) 10 kg, - ve sense\r\n(e) 45 kg, + ve sense.\r\nAns: a\r\n\r\n68. Angle of friction is the\r\n(a) angle between normal reaction and the resultant of normal reaction and the limiting friction\r\n(b) ratio of limiting friction and normal reaction\r\n(c) the ratio of minimum friction force to the friction force acting when the body is just about to move\r\n(d) the ratio of minimum friction force to friction force acting when the body is in motion\r\n(e) ratio of static and dynamic friction.\r\nAns: a\r\n\r\n69. The coefficient of friction depends on\r\n(a) area of contact\r\n(b) shape of surfaces\r\n(c) strength of surfaces\r\n(d) nature of surface\r\n(e) all of the above.\r\nAns: d\r\n\r\ncoefficient of Friction\r\n\r\n70. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction\r\n(a) along the plane\r\n(b) horizontally\r\n(c) vertically\r\n(d) at an angle equal to the angle of friction to the inclined plane\r\n(e) unpredictable.\r\nAns: d\r\n\r\n71. The ratio of limiting friction and normal reaction is known as\r\n(a) coefficient of friction\r\n(b) angle of friction\r\n(c) angle of repose\r\n(d) sliding friction\r\n(e) friction resistance.\r\nAns: a\r\n\r\n72. Which one of the following statements is not correct\r\n(a) the tangent of the angle of friction is equal to coefficient of friction\r\n(b) the angle of repose is equal to angle of friction\r\n(c) the tangent of the angle of repose is equal to coefficient of friction\r\n(d) the sine of the angle of repose is equal to coefficient to friction\r\n(e) none of the above.\r\nAns: d\r\n\r\n73. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be\r\n(a) towards the wall at its upper end\r\n(b) away from the wall at its upper end\r\n(c) upwards at its upper end\r\n(d) downwards at its upper end\r\n(e) none of the above.\r\nAns: c\r\n\r\n74. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be\r\n(a) downwards at its upper end\r\n(b) upwards at its upper end\r\n(c) perpendicular to the wall at its upper end\r\n(d) zero at its upper end\r\n(e) none of the above.\r\nAns: d\r\n\r\n76. Frictional force encountered after commencement of motion is called\r\n(a) post friction\r\n(b) limiting friction\r\n(c) kinematic friction\r\n(d) frictional resistance\r\n(e) dynamic friction.\r\nAns: e\r\n\r\n77. Coefficient of friction is the\r\n(a) angle between normal reaction and the resultant of normal reaction and the limiting friction\r\n(b) ratio of limiting friction and normal reaction\r\n(c) the friction force acting when the body is just about to move\r\n(d) the friction force acting when the body is in motion\r\n(e) tangent of angle of repose.\r\nAns: b\r\n\r\n78. Pick up wrong statement about friction force for dry surfaces. Friction force is\r\n(a) proportional to normal load between the surfaces\r\n(b) dependent on the materials of contact surface\r\n(c) proportional to velocity of sliding\r\n(d) independent of the area of contact surfaces\r\n(e) none of the above is wrong statement.\r\nAns: c\r\n\r\n79. A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to\r\n(a) W \r\n(b) W sin (a + $)\r\n(c) Wtan(a + &lt;|)) \r\n(d) W\\an(a-&lt;t&gt;)\r\n(e) Wtana.\r\nAns: c\r\n\r\n80. A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t - 4), the acceleration of the particle will be given by the equation\r\n(a) 3t2-lt \r\n(b) 3t2+2t\r\n(c) 6f-8 \r\n(d) 6f-4\r\n(e) 6t2-8t.\r\nAns: c\r\n\r\n81. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella\r\n(a) more inclined when moving\r\n(b) less inclined when moving\r\n(c) more inclined when standing\r\n(d) less inclined when standing\r\n(e) none of the above.\r\nAns: d\r\n\r\n86. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is\r\n(a) 0\u00b0 \r\n(b) 30\u00b0\r\n(c) 45\u00b0 \r\n(d) 60\u00b0\r\n(e) 90\u00b0.\r\nAns: c\r\n\r\n88. Limiting force of friction is the\r\n(a) tangent of angle between normal-reaction and the resultant of normal reaction and limiting friction\r\n(b) ratio of limiting friction and normal reaction\r\n(c) the friction force acting when the body is just about to move\r\n(d) the friction force acting when the body is in motion\r\n(e) minimum force of friction.\r\nAns: c\r\n\r\n89. Coulomb friction is the friction between\r\n(a) bodies having relative motion\r\n(b) two dry surfaces\r\n(c) two lubricated surfaces\r\n(d) solids and liquids\r\n(e) electrically charged particles.\r\nAns: a\r\n\r\n90. Dynamic friction as compared to static friction is\r\n(a) same\r\n(b) more\r\n(c) less\r\n(d) may be less of more depending on nature of surfaces and velocity\r\n(e) has no correlation.\r\nAns: c\r\n\r\n\r\n\r\nEngineering Mechanics MCQ\u00a0 : Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical MCQ Objectives Question and Answers\r\nStrength of material- Notes , articles , Interview Que. &amp; Ans\r\nTechnical Mechanical Interview Question and Answers\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\n\r\n\r\n\r\n&nbsp;","headline":"Engineering Mechanics MCQ Objective Question and Answers Part 3","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-08","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/06\/coefficient-of-Friction-300x155.jpg","height":155,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/engineering-mechanics-mcq-objective-question-and-answers-part-2/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/06/DAlemberts-Principle-300x151.jpg')"></div><span class="sr-only">link to Engineering Mechanics MCQ Objective Question and Answers Part 2</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/engineering-mechanics-mcq-objective-question-and-answers-part-2/">Engineering Mechanics MCQ Objective Question and Answers Part 2</a></p></header><div class="excerpt"><p>Engineering Mechanics MCQ Objective Question and Answers Part 2
Engineering Mechanics Multiple Choice Questions / Objectives Mechanical Questions and Answers  Engineering Mechanics MCQ  :...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/engineering-mechanics-mcq-objective-question-and-answers-part-2/" aria-label="View Post: Engineering Mechanics MCQ Objective Question and Answers Part 2">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Engineering Mechanics MCQ Objective Question and Answers Part 2","url":"\/\/www.gunkrazy.com\/engineering-mechanics-mcq-objective-question-and-answers-part-2\/","articleBody":"Engineering Mechanics MCQ Objective Question and Answers Part 2\r\nEngineering Mechanics Multiple Choice Questions \/ Objectives Mechanical Questions and Answers\r\n\r\n\r\n\r\nEngineering Mechanics MCQ\u00a0 : Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n\r\n31. According to law of triangle of forces\r\n(a) three forces acting at a point will be in equilibrium\r\n(b) three forces acting at a point can be represented by a triangle, each side being proportional to force\r\n(c) if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium\r\n(d) if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two\r\n(e) none of the above.\r\nAns: c\r\n\r\n33. If a rigid body is in equilibrium under the action of three forces, then\r\n(a) these forces are equal\r\n(b) the lines of action of these forces meet in a point\r\n(c) the lines of action of these forces are parallel\r\n(d) (b) and (c) above\r\n(e) none of the above.\r\nAns: d\r\n\r\n34. D' Alembert's principle is used for\r\n(a) reducing the problem of kinetics to equivalent statics problem\r\n(b) determining stresses in the truss\r\n(c) stability of floating bodies\r\n(d) designing safe structures\r\n(e) solving kinematic problems.\r\nAns: a\r\n\r\nWhen an object is accelerating the applied force making it accelerate has to overcome the inertia. This is the force which resists the acceleration (or deceleration) and is equal and opposite to the applied force. This means that the total force acting on the body is zero. Acceleration (a) Applied Force (F) Inertia Force (Fi) F + Fi = 0 so F = -Fi. F = ma. so ma = - Fi. or Fi = - ma. mass.\r\n\r\n35. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if\r\n(a) the floor is smooth, the wall is rough\r\n(b) the floor is rough, the wall is smooth\r\n(c) the floor and wall both are smooth surfaces\r\n(d) the floor and wall both are rough surfaces\r\n(e) will be in equilibrium under all conditions.\r\nAns: c\r\n\r\n38. According to Lami's theorem\r\n(a) three forces acting at a point will be in equilibrium\r\n(b) three forces acting at a point can be represented by a triangle, each side being proportional to force\r\n(c) if three forces acting upon a particle are represented in magnitude and\r\ndirection by the sides of a triangle, taken in order, they will be in equilibrium\r\n(d) if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two\r\n(e) none of the above.\r\nAns: d\r\n\r\n39. Two coplanar couples having equal and opposite moments\r\n(a) balance each other\r\n(b) produce a couple and an unbalanced force\r\n(c) are equivalent\r\n(d) produce a moment of couple\r\n(e) can not balance each other.\r\nAns: e\r\n\r\n40. A framed structure is perfect if it contains members equal to\r\n(a) 2n-3\r\n(b) n-l\r\n(c) '2n-l \r\n(d) n - 2\r\n(e) 3n-2.\r\nwhere n = number of joints in a frame\r\nAns: a\r\n\r\n42. The product of either force of couple with the arm of the couple is called\r\n(a) resultant couple\r\n(b) moment of the forces\r\n(c) resulting couple\r\n(d) moment of the couple\r\n(e) none of the above.\r\nAns: d\r\n\r\n43. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than\r\n(a) two members with unknown forces of the frame\r\n(b) three members with unknown forces of the frame\r\n(c) four members with unknown forces of the frame\r\n(d) three members with known forces of the frame\r\n(e) four members with two known forces.\r\nAns: b\r\n\r\n44. The center of gravity of a uniform lamina lies at\r\n(a) the center of heavy portion\r\n(b) the bottom surface\r\n(c) the mid point of its axis\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: c\r\n\r\n45. Center of gravity of a solid cone lies on the axis at the height\r\n(a) one-fourth of the total height above base\r\n(b) one-third of the total height above base\r\n(c) one-half of the total height above base\r\n(d) three-eighth of the total height above the base\r\n(e) none of the above.\r\nAns: a\r\n\r\n46. Center of percussion is\r\n(a) the point of C.G.\r\n(b) the point of metacentre\r\n(c) the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis\r\n(d) point of suspension\r\n(e) the point in a body about which it can rotate horizontally and oscillate under the influence of gravity.\r\nAns: c\r\n\r\n47. Center of gravity of a thin hollow cone lies on the axis at a height of\r\n(a) one-fourth of the total height above base\r\n(b) one-third of the total height above base\r\n(c) one-half of the total height above base\r\n(d) three-eighth of the total height above the base\r\n(e) none of the above.\r\nAns: b\r\n\r\n48. The units of moment of inertia of an area are\r\n(a) kg\/ m2 \r\n(b) m4\r\n(c) kg\/m2 \r\n(d) m3\r\n(e) kg\/m4.\r\nAns: b\r\n\r\n49. The center of percussion of the homogeneous rod of length L suspended at the top will be\r\n(a) L\/2 \r\n(b) L\/3\r\n(c) 3L\/4 \r\n(d) 2L\/3\r\n(e) 3L\/8.\r\nAns: d\r\n\r\n50. The center of gravity of a triangle lies at the point of\r\n(a) concurrence of the medians\r\n(b) intersection of its altitudes\r\n(c) intersection of bisector of angles\r\n(d) intersection of diagonals\r\n(e) all of the above.\r\nAns: a\r\n\r\n51. The units of moment of inertia of mass are\r\n(a) kg m2 \r\n(b) m4\r\n(c) kg\/m2 \r\n(d) kg\/m\r\n(e) m2\/kg.\r\nAns: a\r\n\r\n52. The possible loading in various members of framed structures are\r\n(a) compression or tension\r\n(b) buckling or shear\r\n(c) shear or tension\r\n(d) all of the above\r\n(e) bending.\r\nAns: a\r\n\r\n53. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve\r\n(a) catenary \r\n(b) parabola\r\n(c) hyperbola \u00a0 \u00a0 \u00a0\r\n(d) elliptical\r\n(e) circular arc.\r\nAns: b\r\n\r\n54. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span\r\n(a) 2.5 cm \r\n(b) 3.0 cm\r\n(c) 4.0 cm\r\n(d) 5.0 cm\r\n(e) 2.0 cm.\r\nAns: c\r\n\r\n55. From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the center of circular plate\r\n(a) 0.5 cm \r\n(b) 1.0 cm\r\n(c) 1.5 cm \r\n(d) 2.5 cm\r\n(e) 0.25 cm.\r\nAns: a\r\n\r\n58. Pick up the incorrect statement from the following :\r\n(a) The C.G. of a circle is at its center\r\n(b) The C.G. of a triangle is at the intersection of its medians\r\n(c) The C.G. of a rectangle is at the inter-section of its diagonals\r\n(d) The C.G. of a semicircle is at a distance of r\/2 from the center\r\n(e) The C-G. of an ellipse is at its center.\r\nAns: d\r\n\r\n59. The center of percussion of a solid cylinder of radius r resting on a horizontal plane will be\r\n(a) r\/2 \r\n(b) 2r\/3\r\n(c) r\/A \r\n(d) 3r\/2\r\n(e) 3r\/A.\r\nAns: d\r\n\r\n62. In the equation of virtual work, following force is neglected\r\n(a) reaction of any smooth surface with which the body is in contact\r\n(b) reaction of a rough surface of a body which rolls on it without slipping\r\n(c) reaction at a point or an axis, fixed in space, around which a body is con-strained to turn\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: d\r\n\r\n\r\n\r\n\r\nEngineering Mechanics MCQ\u00a0 : Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical MCQ Objectives Question and Answers\r\nStrength of material- Notes , articles , Interview Que. &amp; Ans\r\nTechnical Mechanical Interview Question and Answers\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\n\r\n\r\n\r\n&nbsp;","headline":"Engineering Mechanics MCQ Objective Question and Answers Part 2","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-08","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/06\/DAlemberts-Principle-300x151.jpg","height":151,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/engineering-mechanics-mcq-objective-question-and-answers-1/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/06/Force-Definition-300x192.jpg')"></div><span class="sr-only">link to Engineering Mechanics MCQ Objective Question and Answers Part 1</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/engineering-mechanics-mcq-objective-question-and-answers-1/">Engineering Mechanics MCQ Objective Question and Answers Part 1</a></p></header><div class="excerpt"><p>Engineering Mechanics MCQ Objective Question and Answers Part 1 
Engineering Mechanics Multiple Choice Questions / Objectives Mechanical Questions and Answers   Engineering Mechanics MCQ  :...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/engineering-mechanics-mcq-objective-question-and-answers-1/" aria-label="View Post: Engineering Mechanics MCQ Objective Question and Answers Part 1">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Engineering Mechanics MCQ Objective Question and Answers Part 1","url":"\/\/www.gunkrazy.com\/engineering-mechanics-mcq-objective-question-and-answers-1\/","articleBody":"Engineering Mechanics MCQ Objective Question and Answers Part 1\u00a0\r\nEngineering Mechanics Multiple Choice Questions \/ Objectives Mechanical Questions and Answers\u00a0\r\n\r\n\r\nEngineering Mechanics MCQ\u00a0 : Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n\r\n1. The unit of force in S.I. units is\r\n(a) kilogram \r\n(b) newton\r\n(c) watt \r\n(d) dyne\r\n(e) joule.\r\nAns: b2. The unit of work or energy in S.I. units is\r\n(a) newton \r\n(b) pascal\r\n(c) kilogram meter\r\n(d) watt \r\n(e)\u00a0 joule.\r\nAns: e3. The unit of power in S.I. units is\r\n(a) newton meter\r\n(b) watt\r\n(c)\u00a0 joule \r\n(d) kilogram meter\/sec.\r\n(e) pascal per sec.\r\nAns: b\r\n\r\n4. Forces are called concurrent when their lines of action meet in\r\n(a) one point \u00a0 \u00a0 \u00a0 \r\n(b) two points\r\n(c) plane \r\n(d) perpendicular planes\r\n(e) different planes.\r\nAns: a\r\n\r\n5. Forces are called coplanar when all of them acting on body lie in\r\n(a) one point \u00a0 \u00a0 \u00a0 \r\n(b) one plane\r\n(c) different planes\r\n(d) perpendicular planes\r\n(e) different points.\r\nAns: b\r\n\r\n6. A force acting on a body may\r\n(a) introduce internal stresses\r\n(b) balance the other forces acting on it\r\n(c) retard its motion\r\n(d) change its motion\r\n(e) all of the above.\r\nAns: e\r\n\r\n7. Which is the correct statement about law of polygon of forces ?\r\n(a) if any number of forces acting at a point can be represented by the sides\r\nof a polygon taken in order, then the forces are in equilibrium\r\n(b) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium\r\n(c) if a polygon representing forces acting at a point is closed then forces are in equilibrium\r\n(d) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium\r\n(e) none of the above.\r\nAns: d\r\n\r\n8. Effect of a force on a body depends upon\r\n(a) magnitude\r\n(b) direction\r\n(c) position or line of action\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: d\r\n\r\nForce Definition\r\n\r\n9. If a number of forces act simultaneously on a particle, it is possible\r\n(a) not a replace them by a single force\r\n(b) to replace them by a single force\r\n(c) to replace them by a single force through C.G.\r\n(d) to replace them by a couple\r\n(e) to replace them by a couple and a force.\r\nAns: b\r\n\r\n11. A force is completely defined when we specify\r\n(a) magnitude\r\n(b) direction\r\n(c) point of application\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: d\r\n\r\n12. If two equal forces of magnitude P act at an angle 9\u00b0, their resultant will be\r\n(a) P\/2 cos 9\/2\r\n(b) IP sin 9\/2\r\n(c) 2P tan 9\/2\r\n(d) IP cos 9\/2\r\n(e) Psin 9\/2.\r\nAns: d\r\n\r\n13. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of\r\n(a) forces\r\n(b) independence of forces\r\n(c) dependence of forces\r\n(d) balance of force\r\n(e) resolution of forces.\r\nAns: e\r\n\r\n14. The resolved part of the resultant of two forces inclined at an angle 9 in a given direction is equal to\r\n(a) the algebraic sum of the resolved parts of the forces in the given direction\r\n(b) the sum of the resolved parts of the forces in the given direction\r\n(c) the difference of the forces multiplied by the cosine of 9\r\n(d) the sum of the forces multiplied by the sine of 9\r\n(e) the sum of the forces multiplied by the tangent of 9.\r\nAns: a\r\n\r\n15. Which of the following do not have identical dimensions ?\r\n(a) Momentum and impulse\r\n(b) Torque and energy\r\n(c) Torque and work\r\n(d) Kinetic energy and potential energy\r\n(e) Moment of a force and angular momentum.\r\nAns: e\r\n\r\n16. Which of the following is not the unit of distance ?\r\n(a) angstrom \r\n(b) light year\r\n(c) micron \r\n(d) millimetre\r\n(e) milestone.\r\nAns: e\r\n\r\n17. Which of the following is not the unit of power ?\r\n(a) kW (kilowatt)\r\n(b) hp (horse power)\r\n(c) kcal\/sec \r\n(d) kg m\/sec\r\n(e) kcal\/kg sec.\r\nAns: e\r\n\r\n18. Which of the following is not the unit of work, energy and heat ?\r\n(a) kcal \r\n(b) kg m\r\n(c) kWhr \r\n(d) hp\r\n(e) hp hr.\r\nAns: d\r\n\r\n19. Which of the following is not the unit of pressure ?\r\n(a) kg\/cm \r\n(b) ata\r\n(c) atmosphere \u00a0 \u00a0\r\n(d) mm of wcl\r\n(e) newton.\r\nAns: e\r\n\r\n20. The weight of a body is due to\r\n(a) centripetal force of earth\r\n(b) gravitational pull exerted by the earth\r\n(c) forces experienced by body in atmosphere\r\n(d) force of attraction experienced by particles\r\n(e) gravitational force of attraction towards the center of the earth.\r\nAns: e\r\n\r\n21. The forces, which meet at one point, but their lines of action do not lie in a plane, are called\r\n(a) coplanar non-concurrent forces\r\n(b) non-coplanar concurrent forces\r\n(c) non-coplanar non-concurrent forces\r\n(d) intersecting forces\r\n(e) none of the above.\r\nAns: b\r\n\r\n22. When trying to turn a key into a lock, following is applied\r\n(a) coplanar force\r\n(b) non-coplanar forces\r\n(c) lever\r\n(d) moment\r\n(e) couple.\r\nAns: e\r\n\r\n23. Which of the following is not a scalar quantity\r\n(a) time \r\n(b) mass\r\n(c) volume \r\n(d) density\r\n(e) acceleration.\r\nAns: e\r\n\r\n24. According to principle of transmissibility of forces, the effect of a force upon a body is\r\n(a) maximum when it acts at the center of gravity of a body\r\n(b) different at different points in its line of action\r\n(c) the same at every point in its line of action\r\n(d) minimum when it acts at the C.G. of the body\r\n(e) none of the above.\r\nAns: c\r\n\r\n25. Which of the following is a vector quantity\r\n(a) energy \r\n(b) mass\r\n(c) momentum \u00a0 \u00a0\r\n(d) angle\r\n(e) speed.\r\nAns: c\r\n\r\n26. The magnitude of two forces, which when acting at right angle produce resultant force \u00a0of VlOkg and when acting at 60\u00b0 produce resultant of Vl3 kg. These forces are\r\n(a) 2 and V6\r\n(b) 3 and 1 kg\r\n(c) V5 and V5\r\n(d) 2 and 5\r\n(e) none of the above.\r\nAns: c\r\n\r\n27. A number of forces acting at a point will be in equilibrium if\r\n(a) their total sum is zero\r\n(b) two resolved parts in two directions at right angles are equal\r\n(c) sum of resolved parts in any two per-pendicular directions are both zero\r\n(d) all of them are inclined equally\r\n(e) none of the above.\r\nAns: c\r\n\r\n28. Two non-collinear parallel equal forces acting in opposite direction\r\n(a) balance each other\r\n(b) constitute a moment\r\n(c) constitute a couple\r\n(d) constitute a moment of couple\r\n(e) constitute a resultant couple.\r\nAns: c\r\n\r\n29. According to principle of moments\r\n(a) if a system of coplanar forces is in equilibrium, then their algebraic sum is zero\r\n(b) if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero\r\n(c) the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point\r\n(d) positive and negative couples can be balanced\r\n(e) none of the above.\r\nAns: b\r\n\r\n30. Which of the following is not a vector quantity\r\n(a) weight \r\n(b) velocity\r\n(c) acceleration \u00a0 \r\n(d) force\r\n(e) moment.\r\nAns: a\r\n\r\n\r\n\r\n\r\n\r\n\r\nEngineering Mechanics MCQ\u00a0 : Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical MCQ Objectives Question and Answers\r\nStrength of material- Notes , articles , Interview Que. &amp; Ans\r\nTechnical Mechanical Interview Question and Answers\r\nMechanical Subjectwise Basic Concept Notes ,Articles","headline":"Engineering Mechanics MCQ Objective Question and Answers Part 1","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-08","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/06\/Force-Definition-300x192.jpg","height":192,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/heat-and-mass-transfer-mcq-objective-question-and-answers-part-3/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/06/hrad2-300x78.png')"></div><span class="sr-only">link to Heat and Mass Transfer MCQ Objective Question and Answers Part 3  </span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/heat-and-mass-transfer-mcq-objective-question-and-answers-part-3/">Heat and Mass Transfer MCQ Objective Question and Answers Part 3  </a></p></header><div class="excerpt"><p>Heat and Mass Transfer MCQ Objective Question and Answers Part 3  Heat and Mass Transfer Multiple Choice Objective Questions For Aptitude Interview test useful to Mechanical Students .  HMT...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/heat-and-mass-transfer-mcq-objective-question-and-answers-part-3/" aria-label="View Post: Heat and Mass Transfer MCQ Objective Question and Answers Part 3  ">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Heat and Mass Transfer MCQ Objective Question and Answers Part 3 \u00a0","url":"\/\/www.gunkrazy.com\/heat-and-mass-transfer-mcq-objective-question-and-answers-part-3\/","articleBody":"Heat and Mass Transfer MCQ Objective Question and Answers Part 3\r\n\r\n\r\nHeat and Mass Transfer Multiple Choice Objective Questions For Aptitude Interview test useful to Mechanical Students .\r\n\r\n\r\n\r\nHMT MCQ Objective : Part 1 |\u00a0 Part 2 |\u00a0 Part 3\u00a0\r\n\r\n\r\n\r\n\r\n\r\n62. According of Kirchhoff's law,\r\n\r\n\r\n(a) radiant heat is proportional to fourth power of absolute temperature\r\n(b) emissive power depends on temperature\r\n(c) emissive power and absorptivity are constant for all bodies\r\n(d) ratio of emissive power to absorptive power is maximum for perfectly black body\r\n(e) ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body.\r\nAns: e\r\n\r\n63. All radiations in a black body are\r\n(a) reflected \r\n(b) refracted\r\n(c) transmitted \u00a0 \u00a0 \u00a0\r\n(d) absorbed\r\n(e) partly reflected and partly absorbed.\r\nAns: d\r\n\r\n64. According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a\r\n(a) grey body\r\n(b) brilliant white polished body\r\n(c) red hot body \u00a0 \r\n(d) black body\r\n(e) none of the above.\r\nAns: d\r\n\r\n65. The concept of overall coefficient of heat transfer is used in case of heat transfer by\r\n(a) conduction \u00a0 \u00a0 \r\n(b) convection\r\n(c) radiation\r\n(d) conduction and convection\r\n(e) convection and radiation.\r\nAns: d\r\n\r\n66. The unit of overall coefficient of heat transfer is\r\n(a) kcal\/m2 \r\n(b) kcal\/hr \u00b0C\r\n(c) kcal\/m2 hr \u00b0C\r\n(4) kacl\/m hr \u00b0C \u00a0 \r\n(e) kcal\/m3 hr \u00b0C.\r\nAns: c\r\n\r\n68. Joule sec is the unit of\r\n(a) universal gas constant\r\n(b) kinematic viscosity\r\n(c) thermal conductivity\r\n(d) Planck's constant\r\n(e) none of the above.\r\nAns: d\r\n\r\n69. The value of Prandtl number for air is about\r\n(a) 0.1 \r\n(b) 0.3\r\n(c) 0.7 \r\n(d) 1.7\r\n(e) 10.5.\r\nAns: c\r\n\r\n70. The value of the wavelength for maximum emissive power is given by \u2014\r\n(a) Wien's law\r\n(b) Planck's law\r\n(c) Stefan's law\r\n(d) Fourier's law\r\n(e) Kirchhoff's law.\r\nAns: a\r\n\r\n72. Log mean temperature difference in case of counter flow compared to parallel flow will be\r\n(a) same \r\n(b) more\r\n(c) less\r\n(d) depends on other factors\r\n(e) none of the above.\r\nAns: b\r\n\r\n73. The energy distribution of an ideal reflector at higher temperatures is largely in the range of\r\n(a) shorter wavelength\r\n(b) longer wavelength\r\n(c) remains same at all wavelengths\r\n(d) wavelength has nothing to do with it\r\n(e) none of the above.\r\nAns: a\r\n\r\n74. Total emissivity of polished silver compared to black body is\r\n(a) same \r\n(b) higher\r\n(c) more or less same\r\n(d) very much lower\r\n(e) very much higher.\r\nAns: d\r\n\r\n75. According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to\r\n(a) absolute temperature\r\n(b) square of temperature\r\n(c) fourth power of absolute temperature\r\n(d) fourth power of temperature\r\n(e) cube of absolute temperature.\r\nAns: c\r\n\r\n76. Which of the following property of air does not increase with rise in temperature\r\n(a) thermal conductivity\r\n(b) thermal diffusivity\r\n(c) density\r\n(d) dynamic viscosity\r\n(e) kinematic viscosity.\r\nAns: c\r\n\r\n77. The unit of Stefan Boltzmann constant is\r\n(a) watt\/cm2 \u00b0K \u00a0 \u00a0\r\n(b) watt\/cm2\u00b0K\r\n\r\n\r\n(c) watt2\/cm \u00b0K4 \u00a0\r\n(d) watt\/cm2 \u00b0K4\r\n(e) watt\/cm2 \u00b0K2.\r\nAns: d\r\n\r\n78. In free con-vection heat transfer, Nusselt number is function of\r\n(a) Grashoff no. and Reynold no.\r\n(b) Grashoff no. and Prandtl no.\r\n(c) Prandtl no. and Reynold no.\r\n(d) Grashoff no., Prandtl no. and Reynold no.\r\n(e) none of the above.\r\nAns: b\r\n\r\n79. \u00a0 Stefan Boltzmann law is applicable for heat transfer by\r\n(a) conduction \u00a0 \u00a0 \u00a0\r\n(b) convection\r\n(c) radiation\r\n(d) conduction and radiation combined\r\n(e) convection and radiation combined.\r\nAns: c\r\n\r\n\r\n\r\nStefan Boltzmann constant\r\n\r\n\r\n\r\n80. The thermal diffusivities for gases are generally\r\n(a) more than those for liquids\r\n(b) less than those for liquids\r\n(c) more than those for solids\r\n(d) dependent on the viscosity\r\n(e) same as for the liquids.\r\nAns: a81. The thermal diffusivities for solids are generally\r\n(a) less than those for gases\r\n(b) jess than those for liquids\r\n(c) more than those for liquids and gases\r\n(d) more or less same as for liquids and gases\r\n\r\n\u00a0Ans: c\r\n\r\n83. Thermal diffusivity of a substance is\r\n(a) directly proportional to thermal conductivity\r\n(b) inversely \u00a0proportional \u00a0to density \u00a0of substance\r\n(c) inversely proportional to specific heat\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: d\r\n\r\n85. The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as\r\n(a) Krichoff's law\r\n(b) Stefan's law\r\n(c) Wien' law \u00a0 \u00a0 \u00a0 \r\n(d) Planck's law\r\n(e) Black body law.\r\nAns: a\r\n\r\n86. According to Stefan's law, the total radiation from a black body per second per unit area is proportional to\r\n(a) absolute temperature\r\n(b) T2 \r\n(c) T5\r\n(d) t \r\n(e) l\/T.\r\nAns: d\r\n\r\n87. According to Wien's law, the wavelength corresponding to maximum energy is proportion to\r\n(a) absolute temperature (T)\r\n(b) I2 \r\n(c)\u00a0 f\r\n(d)\u00a0 t \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\r\n(e)\u00a0 1\/r.\r\nAns: a\r\n\r\n88. Depending on the radiating properties, a body will be white when\r\n(a) p = 0, x = 0 and a = 1\r\n(b) p=l,T = 0anda = 0\r\n(c) p = 0, x = 1 and a = 0\r\n(d) x = 0, a + p = 1\r\n(e) a = 0, x + p = 1.\r\nwhere a = absorptivity, p = reflectivity, x = transmissivity\r\nAns: b\r\n\r\n89. Depending on the radiating properties, a body will be black when\r\n(a) p = 0, x = 0 and a = 1\r\n(b) p= l,T = 0anda = 0\r\n(c) p = 0, x = 1 and a = 0\r\n(d) x = 0, a + p = 0\r\n(e) a = 0,x + p= 1.\r\nwhere a = absorptivity, p == reflectivity, X = transmissivity.\r\nAns: a\r\n\r\n90. Depending on the radiating properties, a body will be opaque when\r\n(a) p = 0, x = 0 and a = 1\r\n(b) p=l,x = 0anda = 0\r\n(c) p = 0, x = 1 and a = 0\r\n(d) x - 0, a + p = 1\r\n(e) a=0,x + p= 1.\r\nwhere a = absorptivity, p = reflectivity, X = transmissivity.\r\nAns: d\r\n\r\n91. The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit\r\n(a) temperature \u00a0 \u00a0\r\n(b) thickness\r\n(c) area \r\n(d) time\r\n(e) area and time.\r\nAns: d\r\n\r\n92. The ratio of the energy absorbed by the body to total energy falling on it is called\r\n(a) absorptive power\r\n(b) emissive power\r\n(c) absorptivity \u00a0 \u00a0 \r\n(d) emissivity\r\n(e) \u00a0 \u00a0 none of the above.\r\nAns: a\r\n\r\n93. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is\r\n(a) 0.45 \r\n(b) 0.55\r\n(c) 0.40 \r\n(d) 0.75\r\n(e) 0.60.\r\nAns: a\r\n\r\n94. The amount of radiation mainly depends on\r\n(a) nature of body\r\n(b) temperature of body\r\n(c) type of surface of body\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: d\r\n\r\n95. The emissive power of a body depends upon its\r\n(a) temperature\r\n(b) wave length\r\n(c) physical nature\r\n(d) all of the above\r\n(e) none of the above.\r\n\u00a0Ans: d\r\n\r\n96. Two plates spaced 150 mm apart are maintained at 1000\u00b0C and 70\u00b0C. The heat transfer will take place mainly by\r\n(a) convection \u00a0 \u00a0 \u00a0\r\n(b) free convection\r\n(c) forced convection\r\n(d) radiation\r\n(e) radiation and convection.\r\nAns: d\r\n\r\n97. Absorptivity of a body will be equal to its emissivity\r\n(a) at all temperatures\r\n(b) at one particular temperature\r\n(c) when system is under thermal equi-librium\r\n(d) at critical temperature\r\n(e) for a polished body.\r\nAns: c\r\n\r\n98. In regenerator type heat exchanger, heat transfer takes place by\r\n(a) direct mixing of hot and cold fluids\r\n(b) a complete separation between hot and cold fluids\r\n(c) flow of hot and cold fluids alternately over a surface\r\n(d) generation of heat again and again\r\n(e) indirect transfer.\r\nAns: c\r\n\r\n99. A perfect black body is one which\r\n(a) is black in colour\r\n(b) reflects all heat\r\n(c) transmits all heat radiations\r\n(d) absorbs heat radiations of all wave lengths falling on it\r\n(e) fully opaque.\r\nAns: d\r\n\r\n100. Planck's law holds good for\r\n(a) black bodies\r\n(b) polished bodies\r\n(c) all coloured bodies\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: a\r\n\r\n101. If the temperature of a solid surface changes form 27\u00b0C to 627\u00b0C, then its emissive power changes in the ratio of\r\n(a) 3 \r\n(b) 6\r\n(c) 9 \r\n(d) 27\r\n(e) 81.\r\nAns: e\r\n\r\n102. Depending on the radiating properties, body will be transparent when\r\n(a) p = 0, x = 0 and a = 1\r\n(b) p=l,x = 0,anda = 0\r\n(c) p = 0, T= l,anda = 0\r\n(d) X = 0, a + p = 1\r\n(e) \u00a0 \u00a0 a = 0,x + p= 1.\r\nAns: c\r\n\r\n103. \u00a0 A grey body is one whose absorptivity\r\n(a) varies with temperature\r\n(b) varies with the wave length of incident ray\r\n(c) varies with both\r\n(d) does not vary with temperature and wave length of the incident ray\r\n(e)\u00a0 there is no such criterion.\r\nAns: d\r\n\r\n\r\n\r\n\r\n\r\nHMT MCQ Objective : Part 1 |\u00a0 Part 2 |\u00a0 Part 3\u00a0\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical MCQ Objectives Question and Answers\r\nTechnical Mechanical Interview Question and Answers\r\nHeat Transfer Notes , Article , Interview Que. and Ans.\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\nThermal Engineering Projects List - Abstract , Report\r\n\r\n\r\n\r\n&nbsp;","headline":"Heat and Mass Transfer MCQ Objective Question and Answers Part 3 \u00a0","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-07","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/06\/hrad2-300x78.png","height":78,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/heat-and-mass-transfer-mcq-objective-question-and-answers-part-2/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/06/thermal-diffusivity-6-638-300x225.jpg')"></div><span class="sr-only">link to Heat and Mass Transfer MCQ Objective Question and Answers Part 2</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/heat-and-mass-transfer-mcq-objective-question-and-answers-part-2/">Heat and Mass Transfer MCQ Objective Question and Answers Part 2</a></p></header><div class="excerpt"><p>Heat and Mass Transfer MCQ Objective Question and Answers Part 2  Heat and Mass Transfer Multiple Choice Objective Questions For Aptitude Interview test useful to Mechanical Students .  HMT...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/heat-and-mass-transfer-mcq-objective-question-and-answers-part-2/" aria-label="View Post: Heat and Mass Transfer MCQ Objective Question and Answers Part 2">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Heat and Mass Transfer MCQ Objective Question and Answers Part 2","url":"\/\/www.gunkrazy.com\/heat-and-mass-transfer-mcq-objective-question-and-answers-part-2\/","articleBody":"Heat and Mass Transfer MCQ Objective Question and Answers Part 2\r\n\r\n\r\nHeat and Mass Transfer Multiple Choice Objective Questions For Aptitude Interview test useful to Mechanical Students .\r\n\r\n\r\n\r\nHMT MCQ Objective : Part 1 |\u00a0 Part 2 |\u00a0 Part 3\u00a0\r\n\r\n\r\n\r\n\r\n\r\n31. Thermal conductivity of glass-wool varies from sample to sample because of variation in\r\n\r\n\r\n(a) composition \u00a0 \u00a0\r\n(b) density\r\n(c) porosity \r\n(d) structure\r\n(e) all of the above.\r\nAns: e\r\n\r\n32. Thermal conductivity of a material may be defined as the\r\n(a) quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1\u00b0C\r\n(b) quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1\u00b0C\r\n(c) heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces\r\n(d) all of the above\r\n(e) none of the above.\r\n\u00a0Ans: d\r\n\r\n33. Which of the following has maximum value of thermal conductivity\r\n(a) aluminium \u00a0 \u00a0 \u00a0\r\n(b) steel\r\n(c) brass \r\n(d) copper\r\n(e) lead.\r\nAns: a\r\n\r\n34. Moisture would find its way into insulation by vapour pressure unless it is prevented by\r\n(a) high thickness of insulation\r\n(b) high vapour pressure\r\n(c) less thermal conductivity insulator\r\n(d) a vapour seal \u00a0\r\n(e) all of the above.\r\nAns: d\r\n\r\n35. Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in\r\n(a) electric heater\r\n(b) steam condenser\r\n(c) melting of ice\r\n(d) refrigerator condenser coils\r\n(e) boiler.\r\nAns: e\r\n\r\n36. According to Prevost theory of heat exchange\r\n(a) it is impossible to transfer heat from low temperature source to t high temperature source\r\n(b) heat transfer by radiation requires no medium\r\n(c) all bodies above absolute zero emit radiation\r\n(d) heat transfer in most of the cases takes place by combination of conduction, convection and radiation\r\n(e) rate of heat transfer depends on thermal conductivity and temperature difference.\r\nAns: c\r\n\r\n37. The ratio of heat flow Q1\/Q2 from two walls of same thickness having their thermal conductivities as ATj - 2K2 will be\r\n(a) 1\r\n(b) 0.5\r\n(c) 2 \r\n(d) 0.25\r\n(e) 4.0\r\nAns: c\r\n\r\n38. Heat transfer by radiation mainly depends upon\r\n(a) its temperature\r\n(b) nature of the body\r\n(c) kind and extent of its surface\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: d\r\n\r\n39. Thermal diffusivity is\r\n(a) a dimensionless parameter\r\n(b) function of temperature\r\n(c) used as mathematical model\r\n(d) a physical property of the material\r\n(e) useful in case of heat transfer by radiation.\r\nAns: d\r\n\r\nthermal-diffusivity\r\n\r\n40. Thermal diffusivity of a substance is .\r\n(a) proportional \u00a0of thermal \u00a0conductivity\r\n(b) inversely proportional to k\r\n(c) proportional to (k)\r\n(d) inversely proportional to k2\r\n(e) none of the above.\r\nAns: a\r\n\r\n41. Unit of thermal diffusivity is\r\n(a) m2\/hr \r\n(b) m2\/hr\u00b0C\r\n(c) kcal\/m2 hr \u00a0 \u00a0 \u00a0\r\n(d) kcal\/m.hr\u00b0C\r\n(e) kcal\/m2 hr\u00b0C.\r\nAns: a\r\n\r\n43. Thermal conductivity of wood depends on\r\n(a) moisture \r\n(b) density\r\n(c) temperature \u00a0 \u00a0 \r\n(d) all of the above\r\n(e) none of the above.\r\nAns: d\r\n\r\n44. In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by\r\n(a) convection \u00a0 \u00a0 \u00a0\r\n(b) radiation\r\n(c) conduction\r\n(d) both convection and conduction\r\n(e) none of the above.\r\nAns: c\r\n\r\n45. Film coefficient is defined as Inside diameter of tube\r\n(a) Equivalent thickness of film\r\n(b) Thermal conductivity Equivalent thickness of film Specific heat x Viscocity\r\n(c) Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity\r\n(d) Film coefficient x Inside diameter Thermal conductivity\r\n(e) none of the above.\r\nAns: b\r\n\r\n46. Heat conducted through unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called\r\n(a) thermal resistance\r\n(b) thermal coefficient\r\n(c) temperature gradient\r\n(d) thermal conductivity\r\n(e) heat-transfer.\r\nAns: d\r\n\r\n49. The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as\r\n(a) emissivity \r\n(b) transmissivity\r\n(c) reflectivity\r\n(d) intensity of radiation\r\n(e) absorptivity.\r\nAns: d\r\n\r\n50. Emissivity of a white polished body in comparison to a black body is\r\n(a) higher \r\n(b) lower\r\n(c) same\r\n(d) depends upon the shape of body\r\n(e) none of the above.\r\nAns: b\r\n\r\n51. A grey body is one whose absorptivity\r\n(a) varies with temperature\r\n(b) varies with wavelength of the incident ray\r\n(c) is equal to its emissivity\r\n(d) does not vary \u00a0with temperature and. wavelength of the incident ray\r\n(e) none of the above.\r\nAns: c\r\n\r\n53. Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of\r\n(a) \u00a01 :1 \r\n(b) \u00a02: 1\r\n(c) \u00a01 : 2 \r\n(d) \u00a04 : 1\r\n(e) \u00a01 : 4.\r\nAns: c\r\n\r\n55. A non-dimensional number generally associated with natural convection heat transfer is\r\n(a) Grashoff number\r\n(b) Nusselt number\r\n(c) Weber number\r\n(d) Prandtl number\r\n(e) Reynold number.\r\nAns: a\r\n\r\n56. LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is\r\n(a) higher \r\n(b) lower\r\n(c) same\r\n(d) depends on the area of heat exchanger\r\n(e) depends on temperature conditions.\r\nAns: a\r\n\r\n57. In heat exchangers, degree of approach is defined as the difference between temperatures of\r\n(a) cold water inlet and outlet\r\n(b) hot medium inlet and outlet\r\n(c) hot medium outlet and cold water inlet\r\n(d) hot medium outlet and cold water outlet\r\n(e) none of the above.\r\nAns: d\r\n\r\n58. \u00a0 In counter flow heat exchanges\r\n(a) both the fluids at inlet (of heat ex\u00acchanger where hot fluid enters) are in their coldest state\r\n(b) both the fluids at inlet are in their hot\u00actest state\r\n(c) both the fluids .at exit are in their hottest state\r\n(d) one fluid is in hottest state and other in coldest state at inlet\r\n(e) any combination is possible depending on design of heat exchanger.\r\nAns: b\r\n\r\n59. A steam pipe is to be insulated by two insulating materials put over each other. For best results\r\n(a) better insulation should be put over pipe and better one over it\r\n(b) inferior insulation should be put over pipe and better one over it\r\n(c) both may be put in any order\r\n(d) whether to put inferior OIL over pipe or the better one would depend on steam temperature\r\n(e) unpredictable.\r\nAns: a\r\n\r\n61. Fourier's law of heat conduction is valid for\r\n(a) one dimensional cases only\r\n(b) two dimensional cases only\r\n(c) three dimensional cases only\r\n(d) regular surfaces having non-uniform temperature gradients\r\n(e) irregular surfaces.\r\nAns: a\r\n\r\n\r\n\r\n\r\n\r\n\r\nHMT MCQ Objective : Part 1 |\u00a0 Part 2 |\u00a0 Part 3\u00a0\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical MCQ Objectives Question and Answers\r\nTechnical Mechanical Interview Question and Answers\r\nHeat Transfer Notes , Article , Interview Que. and Ans.\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\nThermal Engineering Projects List - Abstract , Report\r\n\r\n\r\n\r\n&nbsp;","headline":"Heat and Mass Transfer MCQ Objective Question and Answers Part 2","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-07","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/06\/thermal-diffusivity-6-638-300x225.jpg","height":225,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal no-thumb"><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/heat-mass-transfer-mcq-objective-question-answers/">Heat and Mass Transfer MCQ Objective Question and Answers Part 1</a></p></header><div class="excerpt"><p>Heat and Mass Transfer MCQ Objective Question and Answers Part 1 
Heat and Mass Transfer Multiple Choice Objective Questions For Aptitude Interview test useful to Mechanical Students .  HMT MCQ...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/heat-mass-transfer-mcq-objective-question-answers/" aria-label="View Post: Heat and Mass Transfer MCQ Objective Question and Answers Part 1">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Heat and Mass Transfer MCQ Objective Question and Answers Part 1","url":"\/\/www.gunkrazy.com\/heat-mass-transfer-mcq-objective-question-answers\/","articleBody":"Heat and Mass Transfer MCQ Objective Question and Answers Part 1\u00a0\r\nHeat and Mass Transfer Multiple Choice Objective Questions For Aptitude Interview test useful to Mechanical Students .\r\n\r\n\r\nHMT MCQ Objective : Part 1 |\u00a0 Part 2 |\u00a0 Part 3\u00a0\r\n\r\n\r\n\r\n\r\n\r\n1. Unit of thermal conductivity in M.K.S. units is\r\n(a) kcal\/kg m2 \u00b0C\r\n(b) kcal-m\/hr m2 \u00b0C\r\n(c) kcal\/hr m2 \u00b0C \u00a0\r\n(d) kcal-m\/hr \u00b0C\r\n(e) kcal-m\/m2 \u00b0C.\r\nAns: b\r\n\r\n2. Unit of thermal conductivity in S.I. units is\r\n(a) J\/m2 sec \r\n(b) J\/m \u00b0K sec\r\n(c) W\/m \u00b0K \r\n(d) (a) and (c) above\r\n(e) (b) and (c) above.\r\nAns: e\r\n\r\n3. Thermal conductivity of solid metals with rise in temperature normally\r\n(a) increases \r\n(b) decreases\r\n(c) remains constant\r\n(d) may increase or decrease depending on temperature\r\n(e) unpredictable.\r\nAns: b\r\n\r\n4. Thermal conductivity of non-metallic amorphous solids with decrease in temperature\r\n(a) increases \r\n(b) decreases\r\n(c) remains constant\r\n(d) may increase or decrease depending on temperature\r\n(e) unpredictable.\r\nAns: b\r\n\r\n5. Heat transfer takes place as per -\r\n(a) zeroth law of thermodynamics\r\n(b) first law of thermodynamic\r\n(c) second law of the thermodynamics\r\n(d) Kirchoff's law (e) Stefan's law.\r\nAns: c\r\n\r\n6. \u00a0When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by\r\n(a) conduction \u00a0 \u00a0 \u00a0\r\n(b) convection\r\n(c) radiation\r\n(d) conduction and convection\r\n(e) convection and radiation.\r\nAns: a7. When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by\r\n(a) conduction \u00a0 \u00a0 \u00a0\r\n(b) convection\r\n(c) radiation\r\n(d) conduction and convection\r\n(e) convection and radiation.\r\nAns: c\r\n\r\n8. Sensible heat is the heat required to\r\n(a) change vapour into liquid\r\n(b) change liquid into vapour\r\n(c) increase the temperature of a liquid of vapour\r\n(d) convert water into steam and superheat it\r\n(e) convert saturated steam into dry steam.\r\nAns: c\r\n\r\n9. The insulation ability of an insulator with the presence of moisture would\r\n(a) increase \r\n(b) decrease\r\n(c) remain unaffected\r\n(d) may increase\/decrease \u00a0depending \u00a0on temperature and thickness of insulation\r\n(e) none of the above.\r\nAns: b\r\n\r\n10. When heat is Transferred by molecular collision, it is referred to as heat transfer by\r\n(a) conduction \u00a0 \u00a0 \u00a0\r\n(b) convection\r\n(c) radiation \r\n(d) scattering\r\n(e) convection and radiation. \r\nAns: b\r\n\r\n11. Heat transfer in liquid and gases takes place by\r\n(a) conduction \u00a0 \u00a0 \u00a0\r\n(b) convection \r\n(c) radiation\r\n(d) conduction and convection\r\n(e) convection and radiation.\r\nAns: b\r\n\r\n12. Which of the following is the case of heat transfer by radiation\r\n(a) blast furnace\r\n(b) heating of building\r\n(c) cooling of parts in furnace\r\n(d) heat received by a person from fireplace\r\n(e) all of the above.\r\nAns: d\r\n\r\n13. Heat is closely related with\r\n(a) liquids \r\n(b) energy\r\n(c) temperature \u00a0 \u00a0 \r\n(d) entropy\r\n(e) enthalpy.\r\nAns: c\r\n\r\n14. Pick up the wrong case. Heat flowing from one side to other depends directly on\r\n(a) face area \r\n(b) time\r\n(c) thickness\r\n(d) temperature difference\r\n(e) thermal conductivity.\r\nAns: c\r\n\r\n15. Metals are good conductors of heat because\r\n(a) their atoms collide frequently\r\n(b) their atoms-are relatively far apart\r\n(c) they contain free electrons\r\n(d) they have high density\r\n(e) all of the above.\r\nAns: a\r\n\r\n16. Which of the following is a case of steady state heat transfer\r\n(a) I.C. engine \u00a0 \u00a0 \u00a0\r\n(b) air preheaters\r\n(c) heating of building in winter\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: e\r\n\r\n17. Total heat is the heat required to\r\n(a) change vapour into liquid\r\n(b) change liquid into vapour\r\n(c) increase the temperature of a liquid or vapour\r\n(d) convert water into steam and superheat it\r\n(e) convert saturated steam into dry steam.\r\nAns: d\r\n\r\n18. Cork is a good insulator because it has\r\n(a) free electrons\r\n(b) atoms colliding frequency\r\n(c) low density \u00a0 \u00a0 \r\n(d) porous body\r\n(e) all of the above.\r\nAns: d\r\n\r\n19. Thermal conductivity of water in general with rise in temperature\r\n(a) increases \r\n(b) decreases\r\n(c) remains constant\r\n(d) may increase or decrease depending on temperature\r\n(e) none of the above.\r\nAns: d\r\n\r\n20. Thermal conductivity of water at 20\u00b0C is of the order of\r\n(a) 0.1 \r\n(b) 0.23\r\n(c) 0.42 \r\n(d) 0.51\r\n(e) 0.64.\r\nAns: d\r\n\r\n21. Temperature of steam at around 540\u00b0C can be measured by\r\n(a) thermometer \u00a0\r\n(b) radiation pyrometer\r\n(c) thermistor \u00a0 \u00a0 \u00a0 \r\n(d) thermocouple\r\n(e) thermopile.\r\nAns: d\r\n\r\n22. Thermal conductivity of air at room temperature in kcal\/m hr \u00b0C is of the order of\r\n(a) 0.002 \r\n(b) 0.02\r\n(c) 0.01 \r\n(d) 0.1\r\n(e) 0.5.\r\nAns: b\r\n\r\n23. The time constant of a thermocouple is\r\n(a) the \u00a0 time \u00a0 taken \u00a0 to \u00a0 attain \u00a0 the \u00a0 final temperature to be measured\r\n(b) the time taken to attain 50% of the value of initial temperature difference\r\n(c) the time taken to attain 63.2% of the value of initial temperature difference\r\n(d) determined by the time taken to reach 100\u00b0C from 0\u00b0C\r\n(e) none of the above.\r\nAns: c\r\n\r\nsimple thermocouple circuit\r\n\r\n24. Thermal conductivity of air with rise in temperature\r\n(a) increases \r\n(b) decreases\r\n(c) remains constant\r\n(d) may increase or decrease depending on temperature\r\n(e) none of the above.\r\nAns: a\r\n\r\n25. Heat flows from one body to other when they have\r\n(a) different heat contents\r\n(b) different specific heat\r\n(c) different atomic structure\r\n(d) different temperatures\r\n(e) none of the above.\r\nAns: d\r\n\r\n26. The concept of overall coefficient of heat transfer is used in heat transfer problems of\r\n(a) conduction \u00a0 \u00a0 \u00a0\r\n(b) convection\r\n(c) radiation\r\n(d) all the three combined\r\n(e) conduction and convection.\r\nAns: e\r\n\r\n27. In heat transfer, conductance equals conductivity (kcal\/hr\/sqm\/\u00b0C\/cm) divided by\r\n(a)\u00a0 hr (time) \r\n(b)\u00a0 sqm (area)\r\n(c) \u00b0C (temperature)\r\n(d) cm (thickness)\r\n(e)\u00a0 kcal (heat).\r\nAns: d\r\n\r\n28. The amount of heat flow through a body by conduction is\r\n(a) directly proportional to the surface area of the body\r\n(b) directly proportional to the temperature difference on the two faces of the body\r\n(c) dependent upon the material of the body\r\n(d) inversely proportional to the thickness of the body\r\n(e) all of the above.\r\nAns: e\r\n\r\n29. Which of the following has least value of conductivity\r\n(a) glass \r\n(b) water\r\n(c) plastic \r\n(d) rubber\r\n(e) air.\r\nAns: e\r\n\r\n\r\n\r\n\r\n30. \u00a0Which of the following is expected to have highest thermal conductivity\r\n(a) steam \r\n(b) solid ice\r\n(c) melting ice \u00a0 \u00a0 \u00a0\r\n(d) water\r\n(e) boiling water.\r\nAns: b\r\n\r\n\r\n\r\nHMT MCQ Objective : Part 1 |\u00a0 Part 2 |\u00a0 Part 3\u00a0\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical MCQ Objectives Question and Answers\r\nTechnical Mechanical Interview Question and Answers\r\nHeat Transfer Notes , Article , Interview Que. and Ans.\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\nThermal Engineering Projects List - Abstract , Report\r\n\r\n\r\n\r\n&nbsp;","headline":"Heat and Mass Transfer MCQ Objective Question and Answers Part 1","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-07","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"","height":0,"width":0},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <nav class="pagination-wrapper" aria-label="article pagination"> <a class="prev page-numbers" href="?page_num=36">&laquo; PREV</a> <a class="page-numbers" href="?page_num=1"><span class="screen-reader-text">Page </span>1</a> <span class="page-numbers dots">&hellip;</span> <a class="page-numbers" href="?page_num=35"><span class="screen-reader-text">Page </span>35</a> <a class="page-numbers" href="?page_num=36"><span class="screen-reader-text">Page </span>36</a> <span aria-current="page" class="page-numbers current"><span class="screen-reader-text">Page </span>37</span> <a class="page-numbers" href="?page_num=38"><span class="screen-reader-text">Page </span>38</a> <a class="page-numbers" href="?page_num=39"><span class="screen-reader-text">Page </span>39</a> <span class="page-numbers dots">&hellip;</span> <a class="page-numbers" href="?page_num=338"><span class="screen-reader-text">Page </span>338</a> <a class="next page-numbers" href="?page_num=38">NEXT &raquo;</a></nav></section></main><aside id="secondary" class="widget-area"><div class="about-wrapper"><h2 class="widget-title" style="background: #d693c6; color: #ff392e">About Us</h2><div class="about-image" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2020/03/Sachin-Thorat-300x300-min.png')"></div><p class="about-copy">LearnMech.Com is a Mechanical Project-oriented platform run by Sachin Thorat who is a B-Tech Graduate in Mechanical Engineering. 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