單項(xiàng)選擇題If you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring failure would be （）

A.a glazed surface on the spring
B.nicks in the protective coating
C.a build up of sludge deposits
D.cracks in the surface of the spring


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1.單項(xiàng)選擇題Which of the routine maintenance procedure listed is required for starting air receivers?（）

A.Frequent draining of accumulated moisture
B.Frequent testing of relief valves
C.A close watch on temperature to prevent fluctuations in pressure
D.Frequent cleaning to re move oil and foreign matter

2.單項(xiàng)選擇題Which of the routine maintenance procedures listed is required for starting air receivers?（）

A.over-speeding
B.overload
C.low exhaust temperature
D.high crankcase pressure

3.單項(xiàng)選擇題A large two-stroke/cycle direct reversing diesel engine is to be reversedPrior to the admission of starting air you must （）

A.line up the engine fore restarting with light diesel oil
B.reposition the fuel injection cam
C.change the intake and exhaust valve cam positions
D.place the starting cam in the intermediate position

4.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

5.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