17) The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.

18) The reheat factor is the ratio of the

19) The turbine blades do not change the direction of steam issuing from the nozzle.

20) Thermal equilibrium means that the flow of steam is

21) When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be