Machine Design MCQ Objective Question and Answers Part 4
机器设计多项选择客观问题对于技术能力测试有用。
101. The piston rod of a steam engine is usually connected to the crosshead by means of
(a) bolted joint
(b) kunckle joint
(c) cotter joint
(d)通用联合
(e) universal coupling.
ANS:C
102.以下哪种管接头适用于携带蒸汽的管道
(a) flanged
(b)螺纹
(c)贝尔和龙头
(d) expansion
(e)压缩。
答:D.
103. Spring index is
(a)线圈直径与线径的比率
(b) load required to produce unit deflection
(c)其储存能量的能力
(d)春季质量的迹象
(e)没有。
ANS:A
与重紧密的卷绕弹簧中的线的外表面相比,内表面中的剪切应力
(a)更大
(b) smaller
(c) equal
(d)根据弹簧线圈的直径更大/更小
(e)不可预测。
ANS:A
105.春天的形式系数是
(a)线圈直径与线径的比率
(b) load required to produce unit deflection
(c)其储存能量的能力
(d)关注春季电线的强度
(e) nothing
ANS:C
106. Spring stiffness is
(a)线圈直径与线径的比率
(b) load required to produce unit deflection
(c)其储存能量的能力
(d)吸收冲击的能力
(e)以上都不是。
ANS:B
107. When two springs are in series (having stiffness K), the equivalent stiffness will be
(a) K
(b) K/2
(c) 2K
(d) KIA
(e) UK.
ANS:B
108. When a close coiled helical spring is compressed, its wire is subjected to
(a)紧张
(b)剪切
(c)压缩
(d)以上所有
(e)以上都不是。
ANS:A
109. If a spring is cut down into two springs, the stiffness of cut springs will be
(a) half
(b) same
(c)双重
(d) unpredictable
(e)以上都不是。
ANS:C
110. Belt slip may occur due to
(a) heavy load
(b) loose belt
(c) driving pulley too small
(d)以上所有
(e)以上都不是。
答:D.
111.通常由飞机体制成
(a)焊接
(b) precasting
(c) rivetting
(d)铸造
(e) unconventional methods.
ANS:C
112. If two springs are in parallel then their overall stiffness will be
(a) half
(b) same
(c)双重
(d) unpredictable
(e)以上都不是。
ANS:C
113.在流体动力学轴承中
(a)仅通过轴的旋转产生油膜压力
(b)油膜是由联合国提供石油der pressure
(c) do not require external supply of lubricant
(d)润滑脂用于润滑
(e)以上都不是。
ANS:A
114.抗膛轴承是
(a)套筒轴承
(b)流体动力学轴承
(c)薄润滑轴承
(d)球和滚子轴承
(e)以上都不是。
ANS:E.
115. If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by
(a) ZN/p
(b)p / zn
(c) Z/pN
(d) N/Zp
(e)zp / n。
ANS:A
116. The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is
(a) 0.01 micron
(b) 0.1 micron
(c)1微米
(d)10微米
(e) 25 microns.
ANS:C
117.在静水轴承中
(a)仅通过轴的旋转产生油膜压力
(b)油膜是由联合国提供石油der pressure
(c) do not require external supply of lubricant
(d)润滑脂用于润滑
(e)以上都不是。
ANS:B
118.轴胎轴承的油应在负荷是
(a) nil or lightest
(b) maximum
(c)平均
(d) any one of the above
(e)不可预测。
ANS:A
119. The rated life of a bearing varies
(a)直接作为负载
(b) inversely as square of load
(c) inversely as cube of load
(d)与负载的第四个力量相反
(e)以上都不是。
ANS:C
120. In oilness bearings
(a)仅通过轴的旋转产生油膜压力
(b)油膜是由联合国提供石油der pressure
(c) do not require external supply of lubricant
(d) grease required to be applied after some intervals
(e)以上都不是。
ANS:C
121.在V形皮带驱动器中,皮带接触
(a) at bottom
(b) at sides only
(c)底部和侧面
(d)可以接触任何地方
(e)以上都不是。
ANS:B
122.三种不同的重量从真空下的一定高度落下。他们会采取
(a) same time to reach earth
(b)与重量成比例到达地球的时间
(c)与重量成反比的时间以到达地球
(d) unpredictable
(e)以上都不是。
ANS:A
123. In cross or regular lay ropes
(a) direction of twist of wires in strands is opposite to the direction of twist of strands
(b) direction of twist of wires and strands are same
(c)两个相邻股线中的电线沿相反方向扭曲
(d) wires are not twisted
(e)以上都不是。
ANS:A
124. In standard taper roller bearings, the angle of taper of outer raceway is
(a) 5°
(b) 8°
(c) 15°
(d) 25°
(e)40°。
答:D.
125.在复合材料或逆转绳索中
(a) direction of twist of wires in strands is opposite to the direction of twist of strands
(b) direction of twist of wires and strands are same
(c)两个相邻股线中的电线沿相反方向扭曲
(d) wires are not twisted
(e)以上都不是。
ANS:C
126.电线绳中是否需要任何核心
(a)是的
(b) no
(c)有时
(d) rarely
(e) very often.
ANS:A
127.如果螺母中的剪切应力是螺栓中的拉伸应力的一半,那么螺母长度应等于
(a) diameter of bolt
(b)螺栓0.75 x直径
(c)1.25 x直径的螺栓
(d)螺栓直径1.5 x
(e) 0.5 x diameter of bolt.
ANS:A
128. Basic shaft is one
(a)其上偏差为零
(b)较低偏差为零
(c) whose lower as well as upper deviations are zero
(d) does not exist
(e)以上都不是。
ANS:A
基本洞是一个
(a)其上偏差为零
(b)较低偏差为零
(c) whose lower as well as upper deviations are zero
(d) does not exist
(e)以上都不是。
ANS:B
130. I.S.指定以下差分等级总数
(a)18
(b) 16
(c) 20
(d) 22
(e) 14.
ANS:A
131.对于螺母的标准粗螺纹,如果螺母(h)的高度约为螺栓
(a)0.4次
(b)0.6倍
(c) 0.7 times
(d)0.8倍
(e)螺栓正常直径的0.9倍。
ANS:A
132. Allen bolts are
(a) self locking bolts
(b)设计用于冲击载荷
(c) used in aircraft application
(d)在头部提供六边形凹陷
(e)均匀强度螺栓。
答:D.
133. The resultant axial load on a bolt depends on
(a) initial tension
(b)施加外部负荷
(c)螺栓和连接构件的相对弹性屈服(弹簧)
(d) (a) and (b) above
(e) (a), (b) and (c) above.
ANS:E.
134. The connecting rod bolts are tightened up so that tightening stress
(a) is just sufficient to hold parts together
(b)接近屈服点
(c)屈服点的50%
(d) is about yield point divided by safety factor
(e)以上都不是。
ANS:B
135. The connecting rod bolts are tightened up with initial tension greater than the external load so that
(a)关节可能无法开放
(b) bolts are weakest elements
(c) the resultant load on the bolt would not be affected by the external cyclic load
(d)螺栓不会在服务期间松开
(e)以上都不是。
ANS:C
136.如果应用程序要求在一个方向上螺纹上的螺纹螺纹,则以下类型的线程最适合
(a) square
(b)acme
(c)支撑
(d)BSW
(e) metric.
ANS:C
137. When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at
(a) shank
(b) head
(c)中间
(d)在螺纹
(e)螺栓中的任何地方。
答:D.
138. The shock absorbing capacity of a bolt can be increased by
(a)正确收紧它
(b) increasing shank diameter
(c) grinding the shank
(d)使用垫圈
(e)使柄直径等于螺纹的核心直径。
ANS:E.