Theory of Machines

51. If there are L number of links in a mechanism then number of possible inversions is equal to

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

Correct answer: (C)
L

52. If two moving elements have surface contact in motion, such pair is known as

  1. sliding pair
  2. rolling pair
  3. surface pair
  4. lower pair
  5. higher pair.

Correct answer: (E)
higher pair.

53. In a darg link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

  1. equal to sum of other two
  2. greater than sum of other two
  3. less than sum of other two
  4. there is no such relationship
  5. none of the above.

Correct answer: (C)
less than sum of other two

54. In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is

  1. 95 mm
  2. slightly less than 95 mm
  3. slightly more than 95 mm
  4. 45 mm
  5. none of the above.

Correct answer: (B)
slightly less than 95 mm

55. In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

  1. will remain same
  2. will change
  3. could change or remain unaltered depending oh which link is fixed
  4. will not occur
  5. none of the above.

Correct answer: (A)
will remain same

56. In a rigid link OA, velocity of A w.r.t. will be

  1. parallel to OA
  2. perpendicular to OA
  3. at 45° to OA
  4. along AO
  5. along OA.

Correct answer: (B)
perpendicular to OA

57. In a shaper mechanism, the Corioli's component of acceleration will

  1. not exist
  2. exist
  3. depend on position of crank
  4. unpredictable
  5. none of the above.

Correct answer: (B)
exist

58. In above example, the minimum length of the coupler will be

  1. 45 mm
  2. slightly less than 45 mm
  3. slightly more than 45 mm
  4. 95 mm
  5. none of the above.

Correct answer: (C)
slightly more than 45 mm

59. In an ideal machine, the output as compared to input is

  1. less
  2. more
  3. equal
  4. may be less or more depending on efficiency
  5. always less.

Correct answer: (C)
equal

60. In automobiles the power is transmitted from gear box to differential through

  1. bevel gear
  2. universal joint
  3. Hooke's joint
  4. Knuckle joint
  5. Oldham's coupling.

Correct answer: (C)
Hooke's joint

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