單項(xiàng)選擇題Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.

A.main bearings
B.connecting rod bearings
C.piston pin bushings
D.All of the above


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1.單項(xiàng)選擇題After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate refiring of a burner in order for the （）.

A.furnace to be re-purged
B.electric charge to buildup in the igniter
C.fuel pump to restart
D.dram level to stabilize

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)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