Theory of Machines

71. Instantaneous center of rotation of a link in a four bar mechanism lies on

1. right side pivot of this link
2. lift side pivot of this link
3. a point obtained by intersection on extending adjoining links
4. can't occur
5. none of the above.

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72. It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by

1. universal joint
2. knuckle joint
3. Oldham's coupling
4. flexible coupling
5. electromagnetic coupling.

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73. Kinematic pairs are those which have

1. point or line contact between the two elements when in motion
2. surface contact between the two ele-ments when in motion
3. elements of pairs not held together mechanically
4. two elements that permit relative mo-tion
5. none of the above.

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74. Kinematic pairs are those which have two elements that

1. have line contact
2. have surface contact
3. permit relative motion
4. are held together
5. have dynamic forces.

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75. Klein's construction can be used to determine acceleration of various parts when the crank is at

1. inner dead centre
2. outer dead centre
3. right angles to the link of the stroke
4. at 45° to the line of the stroke
5. all of the above.

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76. Klein's construction can be used when

1. crank has a uniform angular velocity
2. crank has non-uniform velocity
3. crank has uniform angular acceleration
4. crank has uniform angular velocity and angular acceleration
5. there is no such criterion.

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77. Klein's construction gives a graphica construction for

1. slider-crank mechanism
2. velocity polygon
3. acceleration polygon
4. four bar chain mechanism
5. angular acceleration.

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78. Klein's construction is useful to determine

1. velocity of various parts
2. acceleration of various parts
3. displacement of various parts
4. angular acceleration of various parts
5. all of the above.

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79. Lower pairs are those which have

1. point or line contact between the two elements when in motion
2. surface contact between the two elements when in motion
3. elements of pairs not -held together mechanically
4. two elements that permit relative motion
5. none of the above.

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80. Oldham's coupling is the

1. second inversion of double slider crank chain
2. third inversion of double slider crank chain
3. second inversion of single slider crank chain
4. third inversion of slider crank chain
5. fourth inversion of double slider crank chain.

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