Theory of Machines

11. A mechanism is an assemblage of

  1. two links
  2. three links
  3. four links or more than four links
  4. all of the above
  5. none of the above.

Correct answer: (C)
four links or more than four links

12. A pantograph is a mechanism with

  1. lower pairs
  2. higher pairs
  3. rolling pairs
  4. turning pairs
  5. spherical pairs.

Correct answer: (A)
lower pairs

13. A point on a link connecting double slider crank chain traces a

  1. straight line
  2. circle
  3. parabola
  4. hyperbola
  5. ellipse.

Correct answer: (E)
ellipse.

14. A slider crank chain consists of following numbers of turning and sliding pairs

  1. I, 3
  2. 2, 2
  3. 3, 1
  4. 4, 0
  5. 0, 4.

Correct answer: (C)
3, 1

15. A universal joint is an example of

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

Correct answer: (B)
lower pair

16. According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on

  1. a triangle
  2. a point
  3. two lines
  4. a straight line
  5. a curve.

Correct answer: (D)
a straight line

17. Ackermann steering gear consists of

  1. sliding pairs
  2. turning pairs
  3. rolling pairs
  4. higher pairs
  5. lower pairs.

Correct answer: (B)
turning pairs

18. An eccentric sheave pivoted at one point rotates and transmits oscillatory motion to a link whose one end is pivoted and other end is connected to it. This mechanism has

  1. 2 links
  2. 3 links
  3. 4 links
  4. 5 links
  5. none of the above.

Correct answer: (C)
4 links

19. Angle of action of cam is defined as the angle

  1. during which the follower returns to its initial position
  2. of rotation of the cam for a definite displacement of the follower
  3. through which the cam rotates during the period in which the follower remains in the highest position
  4. moved by the cam from the instant the follower begins to rise, till it reaches its highest position
  5. moved by the cam from beginning of ascent to the termination of descent.

Correct answer: (E)
moved by the cam from beginning of ascent to the termination of descent.

20. Angle of ascent of cam is defined as the angle

  1. during which the follower returns to its initial position
  2. of rotation of the cam for a definite displacement of the follower
  3. through which the cam rotates during the period in which the follower remains in highest position
  4. moved by the cam from the instant the follower begins to rise, till it reaches its highest position
  5. moved by the cam from beginning oi ascent to the termination of descent.

Correct answer: (D)
moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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