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

The flow in the convergent portion of the nozzle is sub-sonic.

The flow in the divergent portion of the nozzle is super-sonic.

To increase the velocity of steam above sonic velocity (super-sonic) by expanding steam below the critical pressure, the divergent portion for the nozzle is not necessary.

sin² ?

cos² ?

tan² ?

cot² ?

same

less

more

none of these

no heat drop in moving blades

no heat drop in fixed blades

maximum heat drop in moving blades

maximum heat drop in fixed blades

has no effect on

decreases

increases

none of these