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

A positive throughout
B negative throughout
C positive during major portion of the stroke
D negative during major portion of the stroke

Correct Answer: negative throughout

Since the pressure inside the engine cylinder is less than the atmospheric pressure during the suction stroke, therefore a negative loop is formed. During the compression stroke, the work is done on the gases, therefore a higher negative loop is obtained.
Bissoy MCQ
#Machine Dynamics #Flywheel

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