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The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank and $$\theta $$ = Angle of inclination of crank to the line of stroke)
In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at
The secondary unbalanced force is __________ the primary unbalanced force.