單項(xiàng)選擇題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


您可能感興趣的試卷

你可能感興趣的試題

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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