fuel dribbling from leaking fuel injectors
burning fuel with a high carbon content
burning fuel with a high vanadium content
burning fuel with a lower sulphur content
第1题：
In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______.
A.low firing pressure
B.low exhaust temperature
C.mechanical knock in each cylinder
D.fuel knock in each cylinder
第2题：
proper fuel injection
water in the fuel
incomplete combustion
burning of lube oil
第3题：
A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal .the probable ___.
A.engine overload
B.leaky valves
C.stuck or broken piston rings
D.low air injection pressure
第4题：
an isochronous governor
elastic engine mounts
a vibration damper
a cast iron bed plate with good flexible qualities
第5题：
engine overload
leaky valves
stuck or broken piston rings
low air injection pressure
第6题：
Sudden unloading of a diesel engine can cause ______．
A.Decreased fuel efficiency
B.Increased exhaust temperature
C.Black smoke
D.Overspeed trip
第7题：
low combustion temperature
a leaking fuel nozzle check valve
late fuel injection
plugged oil-scraper ring hole
第8题：
Engine operating conditions may be indicated by the color of the exhaust smoke Black smoke could indicate .
A.an insufficient speed droop setting
B.an overloaded engine
C.clogged drain holes in the oil control rings
D.complete combustion
第9题：
water in the fuel
insufficient fuel for combustion
clogged air intake passages
burning lubricating oil
第10题：
a cracked liner
burning lube oil
an overloaded engine
insufficient combustion air