Which of the routine maintenance proce...

单项选择题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

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1.单项选择题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

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2.单项选择题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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3.单项选择题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

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4.单项选择题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

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5.单项选择题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

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6.单项选择题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

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7.单项选择题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

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8.单项选择题Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）

A.clogged air filter
B.compression stroke
C.burned exhaust valves
D.all of the above

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9.单项选择题When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）

A.intake stroke
B.compression stroke
C.power stroke
D.exhaust stroke

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10.单项选择题Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）

A.When heated, it will move proportional to the amount the metal has lengthened or expanded
B.The pointer associated with the pyrometer scale can be made to also measure engine RPM
C.It can be utilized in exhaust manifolds and heat exchangers interchangeably
D.It can indicate temperature at a distant point from the source heat

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