## Theory of Machine In a pantograph, all the pairs are

Sliding pairs
Self-closed pairs
Spherical pairs
Turning pairs

## Theory of Machine Which of the following statement is correct as regard to the difference between a machine and a structure?

The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
All of these
The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another

## Theory of Machine Cam angle is defined as the angle

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Of rotation of the cam for a definite displacement of the follower
During which the follower returns to its initial position
Through which, the cam rotates during the period in which the follower remains in the highest position

(kG² + h²)/h
h²/(kG² + h²)
(kG² + h²)/h²
h/(kG² + h²)

2.50 mm
2 mm
2.22 mm
3.0 mm

## Theory of Machine In higher pair, the relative motion is

Combination of sliding and turning
Purely turning
Purely rotary
Purely sliding