单项选择题

Air in the fuel lines of a diesel engine can cause （）

A.ignition failure
B.oxygen corrosion of the fuel lines
C.the pistons to seize
D.blue smoke

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The condensers located in various stages of a flash evaporator are cooled by（）

A.distillate
B.seawater
C.brine
D.air

单项选择题

Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to （）

A.burn excessive amounts of lube oil
B.overheat without smoking
C.operate with reduce power or stop
D.run away without load

单项选择题

The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）

A.expansion of the combustion gases
B.exhaust and intake valves just closing
C.maximum compression is just being attained
D.fuel injection occurring at that point and combustion begins