Theory of Machines

21. 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.

22. 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

23. Angle of descent 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: (A)
during which the follower returns to its initial position

24. Angle of dwell of cam is defined as the angle

  1. during which the follower returns to its initial position
  2. of rotation of the cam for definite dis¬placement 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 a beginning of ascent to the termination of descent.

Correct answer: (C)
through which the cam rotates during the period in which the follower remains in the highest position

25. Angular acceleration of a link can be determined by dividing the

  1. centripetal component of acceleration with length of link
  2. tangential component of acceleration with length of link
  3. resultant acceleration with length of link
  4. all of the above
  5. none of the above.

Correct answer: (B)
tangential component of acceleration with length of link

26. Any point on a link connecting double slider crank chain will trace a

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

Correct answer: (C)
ellipse

27. Automobile steering gear is an example of

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

Correct answer: (E)
lower pair.

28. Cam angle 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 can from beginning of i ascent to the termination of descent.

Correct answer: (B)
of rotation of the cam for a definite displacement of the follower

29. Cam size depends upon

  1. base circle
  2. pitch circle
  3. prime circle
  4. outer circle
  5. none of the above.

Correct answer: (A)
base circle

30. Corioli's component acts

  1. perpendicular to sliding surfaces
  2. along sliding surfaces
  3. somewhere in between above two
  4. unpredictable
  5. none of the above.

Correct answer: (A)
perpendicular to sliding surfaces

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