A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is knwon as

Mechanical Engineering : Steam Boilers and Engines - Quiz(MCQ)

injector

air preheater

economiser

superheater

Correct Answer : Option (B) : air preheater

Recently Updated in Steam Boilers and Engines Questions

In forced circulation steam boilers, the force is applied

to circulate water

to draw water

to drain off the water

All of the above

Correct Answer : to circulate water

The amount of water evaporated in kg per kg of fuel burnt is called

boiler efficiency

equivalent evaporation from and at 100Â° C

evaporative capacity of a boiler

None of the above

Correct Answer : evaporative capacity of a boiler

The ratio of the actual vacuum to the ideal vacuum in a condenser is called

nozzle efficiency

boiler efficiency

vacuum efficiency

condenser efficiency

Correct Answer : vacuum efficiency

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Steam Boilers and Engines