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What is the correct answer?

4

Which of the following statement is correct?

A. The primary unbalanced force is less than the secondary unbalanced force.

B. The primary unbalanced force is maximum twice in one revolution of the crank.

C. The unbalanced force due to reciprocating masses varies in magnitude and direction both.

D. The magnitude of swaying couple in locomotives is inversely proportional to the distance between the two cylinder centre lines