Q. 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 center lines