單項(xiàng)選擇題Which of the listed conditions can cause lacquer to be deposited on a piston skirt?（）

A.High sulphur content fuel
B.High lube oil temperatures
C.High vanadium content fuel
D.Excessive piston slap


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1.單項(xiàng)選擇題Reducing the clearance between a valve stem and rocker arm will result in the valve （）

A.having a shorter duration of opening
B.having a longer duration of opening
C.closing sooner
D.opening later

2.單項(xiàng)選擇題If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur?（）

A.valve will open later
B.valves will close later
C.amount of fuel injected will be increased
D.amount of fuel injected will be decreased

3.單項(xiàng)選擇題A drop in compression pressure in one cylinder of a diesel engine can be caused by（）

A.a leaking fuel injection nozzle
B.a clogged air filter
C.early fuel injection
D.burned valves

4.單項(xiàng)選擇題If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）

A.on the power stroke
B.on the exhaust stroke
C.at the end of the power stroke
D.at the start of the intake stroke

5.單項(xiàng)選擇題Low cylinder compression pressure and a high exhaust temperature may indicate （）

A.early fuel injection timing
B.leaking valves
C.a continuously open scavenge air port
D.low cooling water temperature