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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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