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Steam Boilers, Engines, Nozzles and Turbines

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

Increases
Decreases
None of these
Has no effect on

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

V = 44.72 hd K
V = 44.72 K hd
V = 44.72 K hd
V = 44.72 K hd

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Steam Boilers, Engines, Nozzles and Turbines
Sulphur content of fuels is very important to the plant operators because it

Retards electric precipitation
Has highly corrosive effect
Has high heating value
Promotes complete combustion

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for gases is

0.528
0.582
0.577
0.546

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