Theory of Machine
In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

log(x₁/x₂)
log(x₁.x₂)
loge(x₁/x₂)
x₁/x₂

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Theory of Machine
In elliptical trammels

Two pairs turning and two pairs sliding
Three pairs turning and one pair sliding
All four pairs are turning
One pair turning and three pairs sliding

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Theory of Machine
Inertia force acts

Opposite to the direction of acceleration force
Along the direction of acceleration force
None of the listed here
Perpendicular to the acceleration force

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Theory of Machine
In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines

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

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