Theory of Machine
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

Simple pendulum
Torsional pendulum
Second's pendulum
Compound pendulum

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Theory of Machine
Open pairs are those which have

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

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

None of these
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
Both (A) and (B)
The algebraic sum of the secondary forces must be equal to zero

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