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单选题
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
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单选题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 openedB
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The explosion relief valves should be manually openedD
The crankcase should remain unopened until the engine has cooled
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单选题Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）A
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water entering the crankcase while engine wash-downs are being performedC
excessive oil leakage during periods of increased blow-byD
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单选题In a diesel engine, blow-by is a result of combustion gases leaking into the crankcase past the （）A
wrist pin bushingsB
compression ringsC
cylinder liner sealsD
cylinder liner sealing ring
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单选题The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.A
reduce water temperatureB
reduce water turbulenceC
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单选题Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）A
back clearanceB
side clearanceC
gap clearanceD
taper clearance
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单选题In a diesel engine, blow-by（）A
increase exhaust back pressureB
causes excessive crankcase pressureC
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单选题In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）A
raw water pump dischargeB
expansion tank outletC
cooling water heat exchangerD
outlet engine jacket water outlet
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a cracked cylinder headB
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a cracked cylinder linerD
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单选题If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）A
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单选题If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST （）A
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考题
单选题How dose water enter the crankcase of a diesel engine?（）A
Through the crankcase exhausterB
As water vapor contained in blow-byC
Demulsifying lube oil passing through the main bearingsD
Condensation from vapor formed in the expansion tank
考题
单选题In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.A
metal particles loosened by wearB
air when no air cleaners are usedC
condensation of water vaporsD
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单选题In a diesel engine cooling water system, a pH of 60 indicates a/an （）.A
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单选题Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）A
Air will enter the cooling systemB
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单选题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 damageB
Apply fire fighting water through the crankcase breatherC
Allow the engine to cool before opening the crankcaseD
Assume that there is no damage to the crankshaft
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