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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially dry saturated steam is

0.546
0.582
0.577
0.601

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Steam Boilers, Engines, Nozzles and Turbines
The function of injector used in small steam plants is to

Dose chemicals in feed water
Pump feed water
Create vacuum in furnace
Create vacuum at turbine exhaust

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Steam Boilers, Engines, Nozzles and Turbines
The crown of the fire box is made hemispherical in order to

Give maximum space
Withstand pressure inside boiler
Give maximum strength
Resist intense heat in fire box

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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
Equal to
None of the listed here
Less than

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Steam Boilers, Engines, Nozzles and Turbines
Hard coke is produced by carburization of coal at

950-1100°C
700-850°C
Atmospheric temperature
500-600°C

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

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

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