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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The variation of steam pressure in the nozzle depends upon

Specific volume of steam
Dryness fraction of steam
All of these
Velocity of steam

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Steam Boilers, Engines, Nozzles and Turbines
An economiser in a boiler

Decreases steam pressure
Increases steam pressure
Decreases fuel consumption
Increases steam flow

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Steam Boilers, Engines, Nozzles and Turbines
Thermal efficiency of a thermal power plant is of the order of

0.3
0.15
0.45
0.2

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Steam Boilers, Engines, Nozzles and Turbines
The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

cos²α
tan²α
cot²α
sin²α

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Steam Boilers, Engines, Nozzles and Turbines
The discharge is __________ at critical pressure.

None of these
Zero
Minimum
Maximum

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of whirl at outlet for an axial discharge turbine is

None of these
Minimum
Maximum
Zero

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