theory of machines MCQs – Page 3

Practise focused theory of machines questions with marked answers for exam preparation and subject revision.

theory of machines Mcqs

41. In a rigid link OA, velocity of A w.r.t. will be___________________?
0

A. at 45 to OA

B. along OA

C. along AO

D. perpendicular to OA

E. parallel to OA

42. Coriolis component is encountered in_________________?
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A. slider crank mechanism

B. all of the above.

C. four bar chain mechanism

D. quick return mechanism of shaper

E. A. and C. above

43. The Kleins method of construction for reciprocating engine mechanism _______________?
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A. is based on acceleration diagram

B. utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine

C. enables determination of Coriolis component

D. is a simplified form of instantaneous center method

E. none of the above

44. The example of higher pair is_________________?
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A. belt, rope and chain drives

B. all of the above

C. none of the above

D. gears, cams

E. ball and roller bearings

45. If D1 and D2 be the diameters of driver and driven pulleys, then belt speed is proportional to__________________?
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A. D1+D2

B. D1

C. D1-D2.

D. D1/D2

E. D2/D1

46. Which of the following has sliding motion________________?
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A. cross head guide

B. crank

C. connecting rod

D. cross-head

E. crank pin

47. Pitch point on a cam is_________________?
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A. none of the above

B. the point on cam pitch curve having the minimum pressure angle

C. the point on cam pitch curve having the maximum pressure angle

D. any point on pitch curve

E. any point on pitch circle

48. Kleins construction can be used when_________________?
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A. crank has uniform angular acceleration

B. crank has a uniform angular velocity

C. crank has non-uniform velocity

D. crank has uniform angular velocity and angular acceleration

E. there is no such criterion

49. A slider crank chain consists of following numbers of turning and sliding pairs_________________?
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A. 0, 4

B. I, 3

C. 2, 2

D. 3, 1

E. 4, 0

50. Kinematic pairs are those which have__________________?
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A. two elements that permit relative mo-tion

B. elements of pairs not held together mechanically

C. none of the above

D. surface contact between the two ele-ments when in motion

E. point or line contact between the two elements when in motion

51. The tendency of a body to resist change from rest or motion is known as_______________?
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A. friction

B. inertia

C. resisting torque

D. resisting force

E. mass

52. Angle of dwell of cam is defined as the angle________________?
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A. during which the follower returns to its initial position

B. of rotation of the cam for definite displacement of the follower

C. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

D. through which the cam rotates during the period in which the follower remains in the highest position

E. moved by the cam from a beginning of ascent to the termination of descent

53. Crowning on pulleys helps__________________?
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A. for automatic adjustment of belt posi-tion so that belt runs centrally

B. in increasing velocity ratio

C. increase belt and pulley life

D. none of the above

E. in decreasing the slip of the belt

54. Elements of pairs held together mechanically is known as ___________________?
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A. rolling pair

B. none of the above

C. closed pair

D. open pair

E. mechanical pair

55. To obviate axial thrust, following gear drive is used_____________________?
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A. double helical gears having identical teeth

B. mutter gears

C. double helical gears having opposite teeth

D. none of the above

E. single helical gear in which one of the teeth of helix angle a is more

56. Shaft revolving in a bearing is the following type of pair________________?
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A. spherical pair,

B. lower pair

C. higher pair

D. bearing pair

E. cylindrical pair

57. The purpose of a link is to________________?
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A. all of the above

B. transmit motion

C. guide other links

D. act as a support

E. none of the above

58. Governor is used in automobile to_______________?
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A. all of the above

B. decrease the variation of speed

C. to control

D. to control SN

E. none of the above

59. Cross head and guides form a _________________?
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A. lower pair

B. higher pair

C. sliding pair

D. rolling pair

E. turning pair

60. the chain is unconstrained when_____________?
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A. L.H.S. > R.H.S

B. L.H.S. = R.H.S

C. there is no such criterion for checking above requirement

D. L.H.S. < R.H.S

E. none of the above

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