Theory of Machine
The unbalanced force due to revolving masses

Varies in magnitude and direction both
Varies in magnitude but constant in direction
Constant in magnitude and direction both
Varies in direction but constant in magnitude

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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.

Any -ve value
Infinity
Zero
Any +ve value

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Theory of Machine
A body is said to be under forced vibrations, when

A body vibrates under the influence of external force
No external force acts on a body, after giving it an initial displacement
None of these
There is a reduction in amplitude after every cycle of vibration

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Theory of Machine
When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

Average tension of the tight side and slack side of the belt
Sum of the tensions on the tight side and slack side of the belt
Tension in the tight side of the belt
Tension in the slack side of the belt

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