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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The basic purpose of drum in boiler is to

Separate steam from water
Serve as storage of steam
Serve as storage of feed water for water wall
Remove salts from water

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Steam Boilers, Engines, Nozzles and Turbines
Expanding steam to a very low pressure (high vacuum) in steam engines is

Economical
Uneconomical
Essential
Desirable

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Steam Boilers, Engines, Nozzles and Turbines
The rate of steam produced in Benson boiler is

100 tonnes/h
250 tonnes/h
135 tonnes/h
175 tonnes/h

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Steam Boilers, Engines, Nozzles and Turbines
Primary air is the air used to

Transport and dry the coal
Air delivered by forced draft fan
Provide air around burners for obtaining optimum combustion
Convert CO (formed in lower zone of furnace) into CO₂ at higher zone

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Steam Boilers, Engines, Nozzles and Turbines
In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is

0.06 bar
0.067 bar
0.053 bar
0.007 bar

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Steam Boilers, Engines, Nozzles and Turbines
The actual vacuum in a condenser is equal to

Barometric pressure + actual pressure
Gauge pressure - atmospheric pressure
Barometric pressure - actual pressure
Gauge pressure + atmospheric pressure

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