Theory of Machine
The two elements of a pair are said to form a _________ when they permit relative motion between them.

Kinematic pair
Sliding pair
Open pair
None of these

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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 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
Acceleration and velocity of the piston P is maximum

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Theory of Machine
Oldham's coupling is the

Second inversion of single slider crank chain
Third inversion of slider crank chain
Third inversion of double slider crank chain
Second inversion of double slider crank chain

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

None of the listed here
Moves as the mechanism moves, but joints are of permanent nature
Vary with the configuration of the mechanism
Remain in the same place for all configurations of the mechanism

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