Theory of Machine
The Klein's diagram is used when

Crank has nonuniform angular acceleration
Crank has uniform angular acceleration
Crank has nonuniform angular velocity
Crank has uniform angular velocity

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
Higher pairs are those which have

Elements of pairs not held together mechanically
Surface contact between the two elements when in motion
Two elements that permit relative motion
Point or line contact between the two elements when in motion

ANSWER DOWNLOAD EXAMIANS APP