27) When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be

28) The gears are termed as medium velocity gears, if their peripheral velocity is

29) The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations.

30) Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.

31) The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow.