SECONDARY_FORCES_IN_RECIPROCATING_MASS_ON_ENGINE_FRAME_ARE?$

1.	SECONDARY_FORCES_IN_RECIPROCATING_MASS_ON_ENGINE_FRAME_ARE?$
A.	of same frequency as of primary forces
B.	twice the frequency as of primary forces
C.	four times the frequency as of primary forces
D.	none of the mentioned
Answer» C. four times the frequency as of primary forces

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