A.improve fuel economy
B.increase the air charge velocity
C.reduce the risk of explosion
D.all of the above
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A.Increased suction head pressure
B.Decreased feedwater temperature
C.Pump recirculating line being open too much
D.Excessive feedwater temperature
A.The safety valve escape piping should be disconnected from the valve body and a blank inserted
B.The boiler vent valves should be opened
C.All handhole/manhole covers should be tightened up as much as possible to preclude any leaks
D.All of the above
A.salinity is abnormally high
B.steam demand is too high
C.water level is abnormally low
D.feedwater flow is low
A.internal crankshaft passages
B.immersion in oil
C.splash lubrication
D.injection lubrication
A.Increases the sludge forming tendency of lube oil
B.Prevents the accumulation of combustible gases
C.Improves lube oil cooling
D.Improves cold weather starting
最新試題
The minimum speed an engine must attain before ignition can occur depends upon （）.
The ability of the governor to prevent fluctuations in engine speed is termed （）.
If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.
What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
How many power strokes per crankshaft revolution are there in an eight cylinder, two stroke/cycle diesel engine?（）
The highest pressure in a diesel engine cylinder normally occurs （）.
Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.
When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）
Combustion knock occurring in a diesel engine can be caused by （）.