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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

Mechanical efficiency
Nozzle efficiency
Blading efficiency
Gross or stage efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The action of steam in a steam turbine is

Static and dynamic
Dynamic
Static
Neither static nor dynamic

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Steam Boilers, Engines, Nozzles and Turbines
During polytropic process

All of these
Heat transfer takes place across cylinder walls
Work is done
Steam may be wet, dry or superheated after expansion

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Steam Boilers, Engines, Nozzles and Turbines
The value of the reheat factor varies from

1.02 to 1.06
1.2 to 1.6
1.6 to 2
1.08 to 1.10

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Steam Boilers, Engines, Nozzles and Turbines
Parson's turbine is a

Impulse-reaction turbine
None of these
Simple impulse turbine
Simple reaction turbine

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Steam Boilers, Engines, Nozzles and Turbines
The feed check valve is used in order to

Regulate flow of boiler water
Allow high pressure feed water to flow to drum and not allow reverse flow to take place
Recirculate unwanted feed water
Check level of water in boiler drum

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