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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1.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

2.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

3.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

4.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

5.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

6.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

8.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

9.单项选择题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?()

A.Low compression pressure and high exhaust temperature
B.Low firing pressure and high exhaust temperature
C.Low compression pressure and low exhaust temperature
D.Low firing pressure and low exhaust temperature

10.单项选择题Excessive valve lash in an auxiliary diesel engine will cause the valves to open()

A.later and close sooner
B.sooner and close later
C.sooner and close sooner
D.later and close later