Theory of Machine
The indicator using Watt mechanism is known as

Thompson indicator
Thomson indicator
Simplex indicator
Richard indicator

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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
Both (A) and (B)
None of these
The algebraic sum of the secondary forces must be equal to zero

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