The secondary unbalanced force produced by the reciprocating parts of a certain cylinder of a given engine with crank radius r and connecting rod length l can be considered as equal to primary unbalanced force produced by the same weight having$

r 2 /4l as equivalent crank radius and rotating at engine speed

an equivalent crank radius r2/4l and rotating at twice the speed of the engine

r2/4l as equivalent crank radius and rotating at engine speed

equivalent crank length of r2/4l and rotating at engine speed

The secondary unbalanced force produced by the reciprocating parts of

1.	The secondary unbalanced force produced by the reciprocating parts of a certain cylinder of a given engine with crank radius r and connecting rod length l can be considered as equal to primary unbalanced force produced by the same weight having$
A.	an equivalent crank radius r<sup>2</sup>/4l and rotating at twice the speed of the engine
B.	r<sup>2</sup>/4l as equivalent crank radius and rotating at engine speed
C.	equivalent crank length of r<sup>2</sup>/4l and rotating at engine speed
D.	none of the mentioned
Answer» B. r<sup>2</sup>/4l as equivalent crank radius and rotating at engine speed

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The secondary unbalanced force produced by the reciprocating parts of a certain cylinder of a given engine with crank radius r and connecting rod length l can be considered as equal to primary unbalanced force produced by the same weight having$

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