Theory of Machines

111. The main disadvantage of the sliding pair is that it is

1. bulky
2. wears rapidly
3. difficult to manufacture
4. (a) and (b) above
5. (a) and (c) above.

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112. The maximum value of the pressure angle in case of cam is kept as

1. 10°
2. 14°
3. 20°
4. 30°
5. 25°.

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113. The moment on the pulley which produces rotation is called

1. inertia
2. momentum
3. moment of momentum
4. work
5. torque.

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114. The number of centers in a crank driven slider crank mechanism are

1. 0
2. 2
3. 4
4. 6
5. may be any number depending upon position of mechanism.

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115. The number of links and instantaneous centers in a reciprocating engine mechanism are

1. 4, 4
2. 4, 5
3. 5, 4
4. 6, 4
5. 4, 6.

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116. The number of links in pantograph mechanism is equal to

1. 2
2. 3
3. 4
4. 5
5. 6

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117. The pressure angle of a cam depends upon

1. offset between centre lines of cam and follower
2. lift of follower
3. angle of ascent
4. sum of radii of base circle and roller follower
5. all of the above.

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118. The purpose of a link is to

1. transmit motion
2. guide other links
3. act as a support
4. all of the above
5. none of the above.

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119. The Scott-Russell mechanism consists of

1. sliding and turning pairs
2. sliding and rotary pairs
3. turning and rotary pairs
4. sliding pairs only
5. turning pairs only.

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120. The sense of Corioli's component is such that it

1. leads the sliding velocity vector by 90°
2. lags the sliding velocity vector by 90°
3. is along the sliding velocity vector
4. leads the sliding velocity vector by 180°
5. none of the above.

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