Theory of Machine
In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by

μ₁ = μ/sin β
μ₁ = μ/cos β
μ₁ = μ sin β
μ₁ = μ cos β

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Theory of Machine
Power of a governor is the

Mean force exerted at the sleeve for a given percentage change of speed
Mean force exerted at the sleeve for maximum equilibrium speed
None of these
Work-done at the sleeve for maximum equilibrium speed

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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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