Theory of Machine
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then

Acceleration and velocity of the piston P is maximum
Acceleration of the piston P is zero and its velocity is maximum
Acceleration and velocity of the piston P is zero
Acceleration of the piston P is maximum and its velocity is zero

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
Crowning on pulleys helps

In increasing velocity ratio
For automatic adjustment of belt position so that belt runs centrally
Increase belt and pulley life
In decreasing the slip of the belt

ANSWER DOWNLOAD EXAMIANS APP