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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The safety valve on boiler drum compared to safety valve on superheater is set at

Lower value
Same value
Lower/higher depending on steam flow
Higher value

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Steam Boilers, Engines, Nozzles and Turbines
An air preheater

Increases the efficiency of the boiler
All of these
Enables low grade fuel to be burnt
Increases evaporative capacity of the boiler

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Steam Boilers, Engines, Nozzles and Turbines
The amount of water evaporated in kg per kg of fuel burnt is called

Boiler efficiency
Equivalent evaporation from and at 100° C
None of these
Evaporative capacity of a boiler

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Steam Boilers, Engines, Nozzles and Turbines
While steam expands in turbines, theoretically the entropy

Behaves unpredictably
Remains constant
Decreases
Increases

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Steam Boilers, Engines, Nozzles and Turbines
The chimney draught varies with

All of these
Height of chimney
Temperature of furnace gases
Climatic conditions

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

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

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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