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

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

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Theory of Machine
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to

Vector sum of radial component and tangential component
Vector sum of radial component and Coriolis component
Vector sum of tangential component and Coriolis component
Vector difference of radial component and tangential component

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