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发布时间:2023-10-21 10:37:58

[单项选择]In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the ().
A. suction pressure regulator
B. thermostatic bypass valve
C. sea water temperature
D. water level in the expansion tank

更多"In a closed diesel engine freshwate"的相关试题:

[单项选择]In any diesel engine closed freshwater cooling system, the lowest pressure exists at the ().
A. jacket water outlet
B. cooling water pump outlet
C. heat exchanger outlet
D. expansion tank atmospheric vent
[单项选择]The highest pressure in any closed diesel engine freshwater cooling system is at the ().
A. jacket water outlet
B. expansion tank inlet
C. heat exchanger inlet
D. cooling water pump outlet
[单项选择]Sludge formation in a diesel engine lube oil system is caused by()
A. carbonization of oils from the combustion chambers
B. emulsions of lube oil and water
C. coagulation of unburned fuel below the piston rings
D. all of the above
[单项选择]The expansion tank in a diesel engine closed freshwater cooling system is located at ()
A. the highest point in the system
B. the lowest point in the system
C. near the floor
D. plate level or near the tank top level
[单项选择]The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and ().
A. reduce water temperature
B. reduce water turbulence
C. provide an air cushion
D. allow for an increase in water volume as the engine warms up
[单项选择]The pH value of water in a diesel engine closed cooling water system should be maintained between ().
A. 60 to75
B. 80 to 95
C. 100 to 115
D. 120 to 135
[单项选择]Engine coolant accumulating in the diesel engine lubricating oil can result from a ()
A. low oil pressure
B. high coolant pressure
C. leaking fuel injector
D. cracked cylinder head or liner
[单项选择]Before starting a diesel engine that has an engine driven lube oil pump, the engineer should ().
A. open the bypass line
B. cut in the lube oil cooler
C. pressurize the lube oil system
D. top off the expansion tank
[单项选择]The marine diesel engine is a type of diesel engine used on ships The () of its operation is not very difficult to understand.
A. principle
B. principal
C. cause
D. case
[单项选择]A diesel engine is similar to a gasoline engine except that the former has no ().
A. cross-head
B. cylinder
C. connecting rod
D. spark plug
[单项选择]Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are ().
A. operated manually once an hour
B. operated until the engine has started
C. placed into operation only at maximum load
D. adjustable to meet lubrication requirements
[单项选择]Diesel engine mufflers accomplish noise reduction by ()
A. reducing exhaust gas velocity
B. increasing the frequency of gas vibration
C. the use of long head pipes
D. the use of zinc electrodes
[单项选择]A diesel engine burns () a gasoline engine of the same capacity in the same period of time.
A. as much fuel as
B. less fuel than
C. less fuel as
D. more fuel than
[单项选择]Diesel engine fuel oil contamination often results in ()
A. governor malfunctions
B. fuel injection system malfunctions
C. high cylinder lube oil temperatures
D. low intake temperatures
[单项选择]Diesel engine crankshaft deflection readings are generally taken at four crank positionsGood engineering practice requires the deflection gage or indicator to be()
A. placed as near the crankpin axis as possible
B. removed each time the crankshaft is repositioned
C. left in place for all four readings
D. reset to zero for all four readings
[单项选择]The diesel engine consumes considerably less fuel than the steam engine for equal output, () enables a motor-ship to load more cargo.
A. why
B. which
C. in which
D. on which
[单项选择]The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the ()
A. method of supplying air
B. cooling system
C. method of igniting fuel
D. valve operating mechanism
[单项选择]An operating turbocharged diesel engine that suddenly loses power, is due to a/an()
A. restricted turbocharger air intake
B. oil leak into the turbocharger
C. dribbling injector
D. low fuel viscosity
[单项选择]High diesel engine cooling water temperatures can be caused by ().
A. air in the cooling system
B. an overhauled water pump
C. correct amount of coolant
D. no air in the cooling system

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