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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The pressure of steam __________ while flowing through a nozzle.

Increases
Decreases
Remains constant
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Caking coals are those which

Burn freely
Burn completely
Form lumps or masses of coke
Show little or no fusing action

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the useful heat drop to the isentropic heat drop is called

Boiler efficiency
Nozzle efficiency
Vacuum efficiency
Condenser efficiency

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

pa = pm × K
pa = pm/K
pa = K/pm
pa = pm + K

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Steam Boilers, Engines, Nozzles and Turbines
Over fire burning is the phenomenon of

Supply of excess coal
Burning CO and unburnt in upper zone of furnace by supplying more air
Supply of excess, air
Fuel bed firing

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Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler is of

Stationary < fire tube type
Natural circulation type
All of the listed here
Horizontal type

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