The velocity of piston in a reciprocating steam engine is given by (where = Angular velocity of crank, r = Radius of crank pin circle, = Angle turned by crank from inner dead centre, and n = Ratio of length of connecting rod to the radius of crank)

• A. <img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-1.png">
• B. <img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-2.png">
• C. <img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-3.png">
• D. <img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-4.png">