most critical in a four-stroke cycle diesel engine
most critical in a two-stroke/cycle diesel engine
most critical in a four-stroke/cycle diesel engine if it is turbocharged
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
第1题：
Improper fuel rack positioning
Lengthy opening of the exhaust valve
Excessively early injection timing
Extended light load operation
第2题：
the inlet valve is open
the exhaust valve is open
both valves are closed
both valves are open
第3题：
A dry-type spark arrestor removes sparks from a diesel engine exhaust by ____.
A.increasing the linear velocity of the exhaust gases
B.changing directions of exhaust gas flow
C.decreasing the temperature of the exhaust gases
D.accelerating the exhaust gas through a reduced size orifice
第4题：
insufficient lubrication
insufficient refrigerant
excess refrigerant
excessive opening of the expansion valve
第5题：
most critical in a four-stroke cycle diesel engine
most critical in a two-stroke/cycle diesel engine
most critical in a four-stroke/cycle diesel engine if it is turbocharged
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
第6题：
the inlet valve is open
the exhaust valve is open
both valves are close
both valves are open
第7题：
direct action of cam shaft
compressed air pressure
hydraulic “push rods”
direct action of the main piston moving down
第8题：
the starting air distributor
the cut-off valve on the air main
the main starting valve
the air bottle control valve
第9题：
the indicating cock
the starting valve
air inlet valve
the exhaust valve
第10题：
burned exhaust valves
excessive spring compression
spring surge
worn valve seats