According to Kennedy’s theorem, if three bodies have plane motions, their instantaneous centers lie on___________________?
		A. a triangle
B. a point
C. two lines
D. a straight line
E. a curve
		A. a triangle
B. a point
C. two lines
D. a straight line
E. a curve
		A. during which the follower returns to its initial position
B. of rotation of the cam for a definite displacement of the follower
C. through which, the cam rotates during the period in which the follower remains in the highest position
D. moved by the cam from the instant the follower begins to rise, till it reaches its highest position
E. moved by the can from beginning of i ascent to the termination of descent
		A. sliding and turning pairs
B. sliding and rotary pairs
C. turning and rotary pairs
D. sliding pairs only
E. turning pairs only
		A. for changing the direction of motion of the belt
B. for applying tension
C. for increasing -velocity ratio
D. all of the above
E. none of the above
		A. Ipocf
B. Ipocf
C. Ip oc j
D. Ipoc-
E. none of the above
		A. material of the pulley
B. material of the belt
C. larger size of the driver pulley
D. uneven extensions and contractions due to varying tension
E. expansion of belt
		A. belt, rope and chain drives
B. gears, cams
C. ball and roller bearings
D. all of the above
E. none of the above