Theory of Machine
The power from the engine to the rear axle of an automobile is transmitted by means of

Hooke's joint
Worm and worm wheel
Spur gears
Bevel gears

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Theory of Machine
Kinematic pairs are those which have

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

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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, the acceleration of the piston is _________ when the crank OC and connecting rod PC are at right angles to each other.

Infinity
Any +ve value
Zero
Any -ve value

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