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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

640/3 m/s
640 m/s
160/3 m/s
320/3 m/s

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Steam Boilers, Engines, Nozzles and Turbines
Cut-off ratio is the ratio of

Clearance volume to the volume at cut-off
Swept volume to the volume at cut-off
Volume at cut-off to the clearance volume
Volume at cut-off to the swept volume

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Steam Boilers, Engines, Nozzles and Turbines
In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.

More than
None of the listed here
Equal to
Less than

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Steam Boilers, Engines, Nozzles and Turbines
Thermal efficiency of well maintained boiler will be of the order

0.5
0.9
0.75
0.4

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Steam Boilers, Engines, Nozzles and Turbines
Steam exhaust from high pressure turbine is reheated in

A separate coil located in convection path
Boiler drums
Economizer
Superheater tubes

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of heat equivalent to brake power to the energy supplied in steam is known as

Brake thermal efficiency
Mechanical efficiency
Indicated thermal efficiency
Overall efficiency

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