Theory of Machines

81. Open 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 motion
5. none of the above.

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82. Peaucellier mechanism has

1. eight links
2. six links
3. four links
4. twelve links
5. five links.

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83. Pitch point on a cam is

1. any point on pitch curve
2. the point on cam pitch curve having the maximum pressure angle
3. any point on pitch circle
4. the point on cam pitch curve having the minimum pressure angle
5. none of the above.

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84. Polar moment of inertia (IP) of ac disc is to ht determined by suspen by a wire and noting the frequei oscillations (/)

1. Ipocf
2. Ipocf
3. Ip oc j
4. Ipoc-
5. none of the above.

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85. Pulley in a belt drive acts as

1. cylindrical pair
2. turning pair
3. rolling pair
4. sliding pair
5. surface pair.

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86. Rectangular bar in a rectangular hole is the following type of pair

1. completely constrained motion
2. partially constrained motion
3. incompletely constrained motion
4. freely constrained motion
5. none of the above.

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87. Rectilinear motion of piston is converted into rotary by

1. cross head
2. slider crank
3. connecting rod
4. gudgeon pin
5. four bar chain mechanism.

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88. Relationship between the number of links (L) and number of pairs (P) is

1. P = 2L-4
2. P = 2L + 4
3. P = 2L+2
4. P = 2L-2
5. P = L-4.

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89. Sense of tangential acceleration of a link

1. is same as that of velocity
2. is opposite to that of velocity
3. could be either same or opposite to velocity
4. is perpendicular to that of velocity
5. none of the above.

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90. Shaft revolving in a bearing is the following type of pair

1. lower pair
2. higher pair
3. spherical pair,
4. cylindrical pair
5. bearing pair.

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