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
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相关考题
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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 -
单项选择题
If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.
A.high steam pressure in the boiler
B.abnormally high feed water temperature
C.abnormally high boiler water temperature
D.steam demand exceeding feed pump capacity -
单项选择题
Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）
A.Clogged air intake falters
B.Piston blow-by
C.A defective after-cooler
D.Faulty exhaust valves
