單項(xiàng)選擇題If a diesel engine is smoking excessively under load, the cause could be （）

A.low exhaust back pressure
B.early fuel injection in one of the cylinders
C.compression pressure in one of the cylinders
D.plugged injector holes


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1.單項(xiàng)選擇題A diesel engine emits blue exhaust smoke as a result of（）

A.cold intake air
B.excessive compression pressure
C.excessive cylinder lubrication
D.a light load

2.單項(xiàng)選擇題Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）

A.grinding the spare plunger to the barrel
B.replacing the plunger and the barrel
C.highly polishing both the plunger and barrel
D.replacing plunger only

3.單項(xiàng)選擇題Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）

A.Control the amount of lube oil burned in the combustion chamber
B.Transmit heat from the piston to the cylinder liner
C.Prevent damage to ring groove inserts by acting as a heat dam
D.Dissipate combustion chamber gas pressure by channeling it through the ring gap

4.單項(xiàng)選擇題Piston compression rings used in a diesel engine function to （）

A.transfer heat from the cylinder to the piston
B.scrape oil from the sides of the piston
C.seal the combustion space from the crankcases
D.prevent any piston contact with the cylinder liner

5.單項(xiàng)選擇題An indicator card or pressure-volume diagram, shows graphically the （）

A.compression ratio of the engine
B.volume of the engine
C.relationships between pressure and volume during one stroke of the engine
D.relationships between pressure and volume during one cycle of the engine