Theory of Machines

21. 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.

View answer

22. 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.

View answer

23. 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.

View answer

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

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

View answer

25. Automobile steering gear is an example of

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

View answer

26. 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.

View answer

27. Cam size depends upon

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

View answer

28. 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.

View answer

29. Corioli's component is encountered in

1. quick return mechanism of shaper
2. four bar chain mechanism
3. slider crank mechanism
4. (a) and (c) above
5. all of the above.

View answer

30. Corioli's component of acceleration exists whenever a point moves along a path that has

1. linear displacement
2. rotational motion
3. tangential acceleration
4. centripetal acceleration
5. none of the above.

View answer