A.moisture
B.dirt
C.acid
D.air
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A.relieve excess fuel oil pressure during the “off” fire cycle
B.admit water to the dry pipe
C.throttle the forced draft fan output for proper combustion
D.reduce excess steam pressure in the boiler
A.60 to75
B.80 to 95
C.100 to 115
D.120 to 135
A.heat conduction into the injected fuel oil
B.heat conduction into the water jacket wall
C.water circulation through passages in the holder
D.fuel oil circulation through passages in the holder
A.slightly acidic condition
B.slightly alkaline condition
C.overtreatment of water
D.neutral condition of water
A.Combustion gases flow through the tubes
B.Flames impinge on the tubes
C.Combustion occurs in the tubes
D.Water flows through the tubes
最新試題
For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.
To determine if the lube oil filter elements need changing, （）.
Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.
Maximum horsepower of a diesel engine is attained （）.
How many power strokes per crankshaft revolution are there in an eight cylinder, two stroke/cycle diesel engine?（）
The function of diesel engine piston compression rings is to （）.
When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
A thrust bearing is used with a propulsion diesel engine to （）.
The main purpose of the piston oil scraper rings is to （）.