## Theory of Machine In a four bar chain or quadric cycle chain

One is a turning pair and three are sliding pairs
Each of the four pairs is a turning pair
Three are turning pairs and one is a sliding pair
Two are turning pairs and two are sliding pairs

Base circle
Dedendum circle
Pitch circle

Twice
Four times
Eight times
Sixteen times

## Theory of Machine In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

There is no such relationship
Greater than sum of other two
Equal to sum of other two
Less than sum of other two

## Theory of Machine When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

Self-closed pair
Lower pair
Higher pair
Force-closed pair

## Theory of Machine In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is

45 mm
95 mm
Slightly more than 95 mm
Slightly less than 95 mm