Theory of Machines

41. 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.

Correct answer: (C)
acceleration diagram

42. 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.

Correct answer: (B)
a large value of pressure angle

43. 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.

Correct answer: (C)
to control SN

44. Hart mechanism has

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

Correct answer: (B)
six links

45. 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.

Correct answer: (A)
point or line contact between the two elements when in motion

46. 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.

Correct answer: (B)
for applying tension

47. 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.

Correct answer: (D)
D1

48. 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.

Correct answer: (A)
incompletely constrained motion

49. 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.

Correct answer: (C)
parallelogram

50. If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be

  1. less
  2. more
  3. same
  4. data are insufficient to determine same
  5. none of the above.

Correct answer: (A)
less

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