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

22) The ratio of the workdone on the blades to the energy supplied to the blades, is called

23) The discharge is __________ at critical pressure.