## Theory of Machine The motion between a pair which takes place in ____ is known as incompletely constrained motion.

One direction only
None of the listed here
More than one direction
Two directions only

## Theory of Machine Flexible coupling is used because

It is easy to disassemble
It is easy to engage and disengage
It prevents shock transmission and eliminates stress reversals

## Theory of Machine Inertia force acts

None of the listed here
Opposite to the direction of acceleration force
Perpendicular to the acceleration force
Along the direction of acceleration force

## Theory of Machine Oldham’s coupling is an inversion of the kinematic chain used in

Rotary engine
Universal joint
Elliptical trammels
Whitworth quick return mechanism

0° and 90°
Both (A) and (B)
180° and 360°
None of these

## Theory of Machine The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints)

n = (l -1) - j
n = 4(l - 1) - 3j
n = 3(l - 1) - 2j
n = 2(l - 1) - 2j