单项选择题

Cooling the intake air supplied to a diesel engine will （）.

A.reduce mean effective pressure
B.decrease average compression pressure
C.decrease air charge density
D.increase power output

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单项选择题
Excessive vibration of an automatically fired auxiliary boiler can be caused by （）

A.air or water in the furnace
B.combustion pulses
C.fuel oil pump failure
D.flame failure
单项选择题
When there is a flame failure in an automatically fired auxiliary boiler, the （）.

A.air supply is shut off
B.fuel supply is shut off
C.water supply is shut off
D.safety valve lifts
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