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

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
None of these

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Crossed belt drive is recommended
Both open belt drive and crossed belt drive is recommended
Open belt drive is recommended
The drive is recommended depending upon the torque transmitted

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

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

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