單項(xiàng)選擇題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


您可能感興趣的試卷

你可能感興趣的試題

1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

5.單項(xiàng)選擇題The crankcase of many diesel engines are kept under a slight vacuum by the ().

A.scavenging action of the piston
B.piston type vacuum pump taking suction off a differential manometer
C.gland exhausting manometer
D.crankcase exhaust fan