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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The condition of steam in boiler drum is always

Wet
Saturated
Supersaturated
Dry

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of cylindrical shell of the Lancashire boiler is of the order of

2 to 4 m
1.75 to 2.75 m
1 to 1.75 m
1 to 1.25 m

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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

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Steam Boilers, Engines, Nozzles and Turbines
The friction in the nozzle __________ exit velocity of steam.

Has no effect on
Decreases
Increases
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Water boils when its vapor pressure

Equals the pressure of water in the container
Equals to atmospheric pressure
Equals that of the surroundings
Equals 760 mm of mercury

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio (p₂/p₁) is given by

(p₂/p₁) = [(n - 1)/2] n + (1/n)
(p₂/p₁) = [2/(n + 1)] n/(n-1)
(p₂/p₁) = [(n + 1)/2] n - (1/n)
(p₂/p₁) = [2/(n - 1)] n/(n + 1)

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