更多"Crankcase explosions in propulsion "的相关试题:
[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]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 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]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]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]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]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]A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.
A. the engine was over filled
B. there might be a fuel leak
C. there might be a water leak
D. all of the above
[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]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]Piston compression rings used in a diesel engine function to （）
A. transfer heat from the cylinder to the piston
B. scrape oil from the sides of the piston
C. seal the combustion space from the crankcases
D. prevent any piston contact with the cylinder liner
[单项选择]Low compression of diesel engine may result from （）
A. a worn cylinder
B. broken piston rings
C. any of A and B
D. none of the above
[单项选择]Worn main bearings in a diesel engine can result in （）
A. decreased compression pressure
B. increased lube oil pressure
C. lower lube oil temperature
D. excessive leakage past the piston rings
[单项选择]Worn diesel engine intake valve guides can result in （）
A. increased engine breathing efficiency
B. excessive valve lash
C. excessive lube oil consumption
D. lower than normal fuel consumption
