Theory of Machine
Which of the following mechanism is an approximate straight line motion mechanism?

Robert's mechanism
Watt's mechanism
Grasshopper mechanism
All of these

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

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

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