单项选择题A defective injector nozzle in a propulsion diesel engine can cause()

A.engine power losses
B.smoking due to unburned fuel
C.high exhaust temperature readings
D.all of the above


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1.单项选择题The major cause of problems occurring with fuel injection equipment is()

A.incorrect replacement of barrels and plungers of jerk pumps
B.overheating of the nozzle orifices
C.cracked pump housings
D.dirt in the fuel

3.单项选择题Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by()

A.employing fuel oil as a cooling medium
B.preventing hard carbon deposit on nozzle tips
C.avoiding fuel oil temperature exceeding builder’s specification
D.ensuring good metallic contact between nozzles and cylinder heads

4.单项选择题One of the advantages in the use of a dry liner over a wet liner is()

A.it is fitted with neoprene O-ring seals
B.the honing process makes it easier to maintain the desired oil film
C.there is likelihood of water leaking into the combustion space
D.it fits more loosely due to a decrease in heat transfer through the composite wall

5.单项选择题One characteristic of a pulse type turbo-charging system is()

A.high average exhaust manifold
B.greatly fluctuating inlet manifold pressure
C.constant exhaust manifold pressure
D.multiple exhaust pipes to the turbocharger

6.单项选择题One advantage of dry cylinder liners used in a diesel engine is the()

A.lower thermal expansion rates than wet liners
B.greater heat transfer rate than wet liners
C.greater wear resistance than wet liners
D.procedure to replace dry liners is simpler than for wet liners

7.单项选择题Intake air flow from a diesel engine turbocharger is directly proportional to engine()

A.exhaust gas pressure
B.exhaust gas temperature
C.speed
D.load

8.单项选择题Which of the listed conditions can be used to determine if lube oil has been diluted by fuel? ()

A.Viscosity is decreased
B.Octane number is altered
C.Pump speed is decreased
D.Blower’s speed is decreased

9.单项选择题It is easier to replace a dry cylinder liner than a wet one because()

A.of the thin wall thickness
B.honing makes it easier to maintain the desired oil ilm
C.water seals are not required
D.it fits more loosely due to a decrease in heat transfer through the composite wall