Theory of Machines

41. For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimidstroke respectively, is

1. maximum and zero
2. zero and maximum
3. minimum and maximum
4. zero and minimum
5. maximum and minimum.

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42. For simple harmonic motion of the of follower, a cosine curve represents

1. displacement diagram
2. velocity diagram
3. acceleration diagram
4. all of the above
5. none of the above.

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43. For the same lift and same angle of ascent, a smaller base circle will give

1. a small value of pressure angle
2. a large value of pressure angle
3. there is no such relation with pressure angle
4. something else
5. none of the above is true.

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44. Governor is used in automobile to

1. decrease the variation of speed
2. to control
3. to control SN
4. all of the above
5. none of the above.

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45. Hart mechanism has

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

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46. Higher 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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47. Idler pulley is used

1. for changing the direction of motion of the belt
2. for applying tension
3. for increasing -velocity ratio
4. all of the above
5. none of the above.

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48. If D1 and D2 be the diameters of driver and driven pulleys, then belt speed is proportional to

1. D1/D2
2. D2/D1
3. D1-D2.
4. D1
5. D1+D2.

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49. If some links are connected such that motion between them can take place in more than one direction, it is called

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

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50. If the opposite links of a four bar linkage are equal, the links will always form a

1. triangle
2. rectangle
3. parallelogram
4. pentagon
5. trapezoid.

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