Why_is_air_pre-heater_used_in_the_boiler? – McqOptions

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1.	Why_is_air_pre-heater_used_in_the_boiler?
A.	To draw in the atmospheric air
B.	To increase thermal efficiency
C.	To heat the air to superheated level
D.	To heat the air in advance
Answer» C. To heat the air to superheated level

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