更多"A diesel engine fails to start beca"的相关试题:
[单项选择]A diesel engine could fail to start because of （）
A. incorrect injection timing
B. low exhaust back pressure
C. floating exhaust valves
D. excessive cranking speed
[单项选择]A diesel engine fails to start due to excessive water in the fuelBefore the engine can be started, the water should be removed from the（）
A. fuel lines
B. lube oil filter
C. crank case pump
D. rocker arm reservoir
[单项选择]If a diesel engine fails to start，one of the likely causes is （）
A. low compression temperature
B. low ambient air pressure
C. high lube oil pump pressure
D. high fuel oil booster pump pressure
[单项选择]If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（）
A. inspection covers should not be opened until the engine has cooled
B. ventilation system should be continued in operation for one hour for cooling
C. scavenge pump should be immediately secured to prevent loss of lube oil
D. explosion covers should be opened slightly to provide extra ventilation
[单项选择]Diesel engine air start valve timing is controlled by（）
A. engine operating speed
B. an air manifold
C. a hydraulic distributor
D. individual cams and valve gear
[单项选择]Diesel engine air start system check valves are opened by （）
A. an air start cam
B. cylinder compression pressure
C. starting air pressure
D. valve springs
[单项选择]If the engine does start on air, but combustion does not immediately begin, the cause may be （）.
A. failure of the fuel pumps
B. starting air pressure too low
C. stop valve in air line closed
D. the turning gear still engaged
[单项选择]High diesel engine cooling water temperatures can be caused by （）.
A. a worn water pump
B. not enough coolant
C. air in the cooling system
D. all of the above
[单项选择]The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）
A. Faulty thermostatic bypass valve
B. Eroded zinc pencils in the heat exchanger
C. Steam formation in the expansion tank
D. Excessive leakage from jacket water pump seal
[单项选择]Diesel engine jacket water is used in the distillation process as the （）.
A. coolant for the distillate
B. coolant for the brine cooler
C. means of heating the feedwater
D. primary means of producing a vacuum within the distiller
[单项选择]When preparing an engine for water temperature（）
A. should be kept at a proper level by a cooler
B. should be raised to about 80℃ by a heater
C. should be raised gradually
D. should be lowered to about 60℃
[单项选择]A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.
A. slight acidity
B. slight alkalinity
C. excessive alkalinity
D. excessive acidity
[单项选择]In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）
A. sea water temperature must never be warmer than 40℃
B. jacket water pressure should always be greater than the sea water pressure
C. jacket water temperature must always be less than 60℃
D. jacket water pressure must always be less than the sea water pressure
[单项选择]During the diesel engine running, the water level of FW expansion tank should normally kept in the （） level of glass tube.
A. the highest
B. above 3/4
C. 1/2-3/4
D. the lowest
[单项选择]In （）, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.
A. a flash generator
B. a flash evaporator
C. a vacuum boiling evaporator
D. a boiler
