單項(xiàng)選擇題A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）

A.feel the high pressure fuel line
B.check the cylinder exhausts for white smoke frequently
C.check the cylinder exhaust temperature
D.isolate each cylinder and inspect the injector


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1.單項(xiàng)選擇題If the compression ratio is increased on any diesel engine, （）

A.the expansion ratio will decrease
B.combustion will be slowed down
C.thermal efficiency will decrease
D.thermal efficiency will increase

2.單項(xiàng)選擇題If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）

A.changed
B.centrifuged
C.filtered
D.settled

3.單項(xiàng)選擇題How are the pressure and temperature affected in a diesel engine cylinder during compression?（）

A.Pressure and temperature decrease
B.Pressure and temperature increase
C.Pressure decreases and temperature increases
D.Pressure increases and temperature decreases

4.單項(xiàng)選擇題A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）

A.excessive cylinder lubrication
B.a lugging engine
C.a leaking cylinder liner
D.overloading of one cylinder

5.單項(xiàng)選擇題The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）

A.method of supplying air
B.cooling system
C.method of igniting fuel
D.valve operating mechanism