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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The ratio of the workdone on the blades to the energy supplied to the blades, is called

Gross or stage efficiency
Mechanical efficiency
Nozzle efficiency
Blading efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The density of supersaturated steam is about __________ that of the ordinary saturated vapor at the corresponding pressure.

8 times
4 times
Same as
2 times

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Steam Boilers, Engines, Nozzles and Turbines
When the nozzle operates with the maximum mass flow, the nozzle is said to be

Choked
None of these
Over-damping
Under-damping

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Steam Boilers, Engines, Nozzles and Turbines
In forced circulation steam boilers, the force is applied

All of these
To drain off the water
To circulate water
To draw water

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam at throat of the nozzle is __________ the velocity of sound.

Equal to
Less than
More than
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

Feed pump
Pressure gauge
Feed check valve
Injector

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