STEAM NOZZLES

The flow of steam in a nozzle is subsonic at......

• Throat

• Entrance

• Convergent portion

• Divergent portion

The flow of steam is supersonic .........

• At the entrance to the nozzle

• At the throat of the nozzle

• In the convergent portion of the nozzle

• In the divergent portion of the nozzle

The maximum velocity attainable at the throat of a steam nozzle is......

• less than sonic velocity

• Sonic velocity

• more than sonic velocity

• Supersonic velocity

Which of the following devices uses wilson's line in determining flow through it.......

• Steam engine

• Steam nozzle

• Reaction turbine

• Impulse turbine

The Effect of friction in a nozzle......dryness fraction of steam

• Increases

• Decreases

• Same

Nozzle efficiency is described as.......

• Isentropic heat drop/useful heat drop

• useful heat drop/isentropic heat drop

• saturation temperature/supersaturation temperature

• supersaturation temperature/saturation temperature

The critical pressure ratio for initially dry saturated steam is.......

• 0.528

• 0.546

• 0.577

• 0.582

The steam leaves the nozzle at a.........

• High pressure and low velocity

• High-pressure and high velocity

• Low pressure and low velocity

• Low pressure and high velocity

In convergent nozzle velocity velocity attained is.......

• Velocity of sound

• Supersonic velocity

• Around 500 m/sec

• 1000 meter/sec

The value of critical pressure ratio for superheated steam is.......

• 0.5

• 0.546

• 0.454

• 0.64