单项选择题

The outlet from an expansion tank of a closed freshwater cooling system should be piped to the （）.

A.cylinder head water outlet header
B.cylinder jacket inlet main
C.heat exchanger inlet connection
D.jacket water pump suction line

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单项选择题

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

单项选择题

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

单项选择题

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