Theory of Machine
In a four stroke I.C. engine, the turning moment during the compression stroke is

Negative throughout
Positive throughout
Negative during major portion of the stroke
Positive during major portion of the stroke

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

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

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