更多"If a crankcase explosion occurs in "的相关试题:
[单项选择]If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?（）
A. Open the crankcase immediately to check for damage
B. Apply fire fighting water through the crankcase breather
C. Allow the engine to cool before opening the crankcase
D. Assume that there is no damage to the crankshaft
[单项选择]When fuel enters the crankcase of a diesel engine, it （）
A. dilutes the lube oil and reduces its viscosity
B. forms sulfuric acid in the lube oil
C. causes pitting and failure of the bearings
D. causes sludge deposits on valve stems
[单项选择]If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?（）
A. The cylinder indicator cocks should be opened
B. The sump lube oil scavenge pump should be secured immediately
C. The explosion relief valves should be manually opened
D. The crankcase should remain unopened until the engine has cooled
[单项选择]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
[单项选择]Water accumulating in the crankcase of a diesel engine could indicate（）
A. a cracked cylinder liner
B. excessive water in the fuel
C. a leaking intercooler
D. excessive moisture in the scavenge air
[单项选择]How dose water enter the crankcase of a diesel engine?（）
A. Through the crankcase exhauster
B. As water vapor contained in blow-by
C. Demulsifying lube oil passing through the main bearings
D. Condensation from vapor formed in the expansion tank
[单项选择]If water is found in the crankcase of a diesel engine, the cause may be due to（）
A. a cracked cylinder head
B. a leaky cylinder head gasket
C. a cracked cylinder liner
D. any of the above
[单项选择]A diesel engine crankcase ventilation system （）
A. prevents spark generation
B. removes combustible gases
C. determines the level of combustible gases
D. provides inert gas generation in crankcase
[单项选择]An increase in diesel engine crankcase pressure generally indicates excessive（）
A. compression pressure
B. lube oil header pressure
C. scavenge air pressure
D. piston ring blow-by
[单项选择]
With regards to a diesel engine crankcase explosion, the most violent is the（）
(1) primary explosion
(2) secondary explosion
A. (1) only
B. (2) only
C. both (1) and (2)
D. neither (1) or (2)
[单项选择]Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）
A. free entry of air to the crankcase
B. water entering the crankcase while engine wash-downs are being performed
C. excessive oil leakage during periods of increased blow-by
D. sub-cooling internal components
[单项选择]Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）
A. back clearance
B. side clearance
C. gap clearance
D. taper clearance
[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
