In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

Steam Boilers, Engines, Nozzles and Turbines
In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

320/3 m/s

640/3 m/s

160/3 m/s

640 m/s

320/3 m/s

640/3 m/s

160/3 m/s

640 m/s

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure gives the velocity of steam at the throat

Equal to the velocity of sound

Less than the velocity of sound

More than the velocity of sound

None of these

Equal to the velocity of sound

Less than the velocity of sound

More than the velocity of sound

None of these

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of internal flue tubes of a Lancashire boiler is about ___ that of its shell.

Two-fifth

One-fourth

One-third

One-half

Two-fifth

One-fourth

One-third

One-half

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of a cylindrical shell of a Scotch marine boiler varies from

3.5 to 4.5 m

1.5 to 2 m

2.5 to 3.5 m

None of these

3.5 to 4.5 m

1.5 to 2 m

2.5 to 3.5 m

None of these

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Steam Boilers, Engines, Nozzles and Turbines
Reheating of steam in a turbine

Reduces wear on the blades

Increases the work-done through the turbine

Increases the efficiency of the turbine

All of these

Reduces wear on the blades

Increases the work-done through the turbine

Increases the efficiency of the turbine

All of these

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Steam Boilers, Engines, Nozzles and Turbines
The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.

15 to 20%

10 to 15%

20 to 30%

30 to 40%

15 to 20%

10 to 15%

20 to 30%

30 to 40%

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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

Steam Boilers, Engines, Nozzles and Turbines The critical pressure gives the velocity of steam at the throat

Steam Boilers, Engines, Nozzles and Turbines The diameter of internal flue tubes of a Lancashire boiler is about ___ that of its shell.

Steam Boilers, Engines, Nozzles and Turbines The diameter of a cylindrical shell of a Scotch marine boiler varies from

Steam Boilers, Engines, Nozzles and Turbines Reheating of steam in a turbine

Steam Boilers, Engines, Nozzles and Turbines The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.

Steam Boilers, Engines, Nozzles and Turbines
In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

Steam Boilers, Engines, Nozzles and Turbines
The critical pressure gives the velocity of steam at the throat

Steam Boilers, Engines, Nozzles and Turbines
The diameter of internal flue tubes of a Lancashire boiler is about ___ that of its shell.

Steam Boilers, Engines, Nozzles and Turbines
The diameter of a cylindrical shell of a Scotch marine boiler varies from

Steam Boilers, Engines, Nozzles and Turbines
Reheating of steam in a turbine

Steam Boilers, Engines, Nozzles and Turbines
The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.