Theory of Machine
Under logarithmic decrement, the amplitude of successive vibrations are

In logarithmic progression
Constant
In geometric progression
In arithmetic progression

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

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

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Theory of Machine
The contact ratio is given by

(Length of the arc of contact)/(Circular pitch)
(Length of the arc of approach)/cosφ
(Length of path of recess)/(Circular pitch)
(Length of the path of approach)/(Circular pitch)

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