單項選擇題Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the （）.

A.air charge density becoming too high
B.piston crown surfaces becoming too cold
C.formation of excessive quantities of condensate
D.compression pressure being greatly reduced


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1.單項選擇題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

2.單項選擇題With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to （）.

A.allow filtration of less viscous oil
B.decrease the pressure drop across the filter
C.improve overall filtration
D.all of the above

3.單項選擇題The bearings used to support the crankshaft are generally called （）

A.line shaft bearings
B.connecting rod beatings
C.main bearings
D.support bearings

4.單項選擇題Improper maintenance of an automatic auxiliary boiler oil burner could result in （）.

A.fuel pump failure
B.fan motor failure
C.increased feedwater consumption
D.decreased boiler efficiency

5.單項選擇題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