If c be the fraction of the reciprocating parts of mass m to be balanced per cyclinder of a steam locomotive with crank radius r, angular speed , distance between centre lines of two cylinders a, then the magnitude of the maximum swaying couple is given by

If c be the fraction of the reciprocating parts of mass m to be balanc

1.	If c be the fraction of the reciprocating parts of mass m to be balanced per cyclinder of a steam locomotive with crank radius r, angular speed , distance between centre lines of two cylinders a, then the magnitude of the maximum swaying couple is given by
A.	1 c / 2 mr <sup>2</sup>a
B.	1 c / 2mr <sup>2</sup>a
C.	2(1 c)mr <sup>2</sup>a
D.	none of the mentioned
Answer» C. 2(1 c)mr <sup>2</sup>a