Theory of Machine
A watt's governor can work satisfactorily at speeds from

80 to 100 r.p.m.
200 to 300 r.p.m.
60 to 80 r.p.m.
100 to 200 r.p.m.

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

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