SECTION-3

##### Q51. The lower pair is

(a) close pair
(b) unclosed pair
(c) point contact pair
(d) both (a) and (b)

Ans:  (d) both (a) and (b)

##### Q52. The higher pair is a

(a) closed pair
(b) unclosed pair
(c) point contact pair
( d) both (a) and (c).

Ans:  ( d) both (a) and (c).

##### Q53. The motion of a shaft with collars at each end in a circular hole is an example of

(a) incompletely constrained motion
(b) completely constrained motion
(c) successfully constrained motion
(d) none of the above.

Ans:  (b) completely constrained motion

##### Q54. The motion of a shaft in a circular hole is an example of

(a) incompletely constrained motion
(b) completely constrained motion
(c) successfully constrained motion
(d) none of the above.

Ans:  (a) incompletely constrained motion

##### Q55. When a point is moving in a curved path, the tangential acceleration is equal to

(a) rate of change in speed
(b) rate of change of square of speed
(c) square of speed/radius of curvature
(d) speed/radius of curvature.

Ans:  (a) rate of change in speed

##### Q56. When a point is moving in a curved path, the normal acceleration is equal to

(a) rate of change in speed
(b) rate of change of square of speed
(c) square of speed/radius of curvature
(d) speed/radius of curvature.

Ans:  (c) square of speed/radius of curvature

##### Q57. Which one of the following statement is wrong?

(a) The normal component of acceleration of a particle moving in a straight path is zero.
(b) The tangential component of acceleration of a particle moving with constant speed is zero.
(c) The normal component of acceleration of a particle moving in a circular path with constant velocity (v) is v2/r.
(d) The tangential component of acceleration of a particle moving in a circular path with constant velocity (v) is v2/r.

Ans:  (d) The tangential component of acceleration of a particle moving in a circular path with constant velocity (v) is v2/r.

##### Q58. In the design of many machines, a knowledge of methods of determining acceleration is essential. The acceleration of any point in a mechanism is determined by

(a) instantaneous centre method
(b) analytical method
(c) acceleration diagram method
(d) only (b) and (c)

Ans:  (d) only (b) and (c)

##### Q59. In a rigid link AB, the point B is moving with respect to A. Then the acceleration of B will be equal to

(a) acceleration of A × distance AB
(b) (acceleration of A) ÷ distance AB
(c) vector sum of acceleration of A and acceleration of B, relative to A
(d) acceleration of A × square of distance AB.

Ans:  (c) vector sum of acceleration of A and acceleration of B, relative to A

##### Q60. In question 77, if ω is the angular velocity of the link AB about A, then normal component of acceleration of B relative to A will be equal to

(a) V2BA/AB
(b)VBAA × AB
(c) V2BA × AB
(d)VBA/AB
where VBA = Linear velocity of B relative to A.

Ans:  (a) V2BA/AB

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##### Read More Sections of Theory of Machine Objective Questions

Each section contains maximum 80 Questions. To practice more questions visit other sections.

Theory of Machine MCQ – Section-1

Theory of Machine MCQ – Section-2

Theory of Machine MCQ – Section-3

Theory of Machine MCQ – Section-4

Theory of Machine MCQ – Section-5

Theory of Machine MCQ – Section-6