incorrect replacement of barrels and plungers of jerk pumps
overheating of the nozzle orifices
cracked pump housings
dirt in the fuel
第1题：
The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by ______.
A.dirt
B.fuel oil
C.governor cooling water
D.fuel oil tar(焦油)
第2题：
deliver proper fuel quantity to the injection nozzle
provide rapid fuel injection cutoff
control fuel quantity entering the pump body
control fuel pressure delivered to the combustion chamber
第3题：
The major cause of fuel pump and injection system problems is _____.
A.improper adjustments
B.contaminated fuel
C.kinked fuel lines
D.excessive engine vibration
第4题：
Improper lubrication
Air in the fuel system
Coated fuel lines
Excessive vibration
第5题：
corrosion and grooving of exhaust valves
corrosion and gumming of the fuel injection pump
salt deposits in the exhaust manifold
slag deposits in the fuel injection equipment
第6题：
cold fuel oil
low fuel oil pressure
low atomizing steam pressure
water in the fuel oil
第7题：
Ⅰ + Ⅱ
Ⅰ ~ Ⅲ
Ⅰ ~ Ⅳ
Ⅰ + Ⅱ + Ⅳ
第8题：
_______can be a direct cause of faulty operation of diesel engine fuel injection nozzles.
A.Excessive fuel nozzle holder cooling
B.Sediment in the fuel supply
C.Distortion of the fuel spray pattern
D.Improper atomization of the fuel
第9题：
improper adjustment
contaminated fuel
kinked fuel lines
excessive engine vibration
第10题：
caused by retarded injection timing
caused by a mechanical defect in one cylinder
caused by high fuel injection pressures
normal for these conditions