單項(xiàng)選擇題If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）

A.excessively late injection timing for each cylinder
B.incorrectly adjusted intake valve timing
C.incorrectly adjusted fuel injector
D.incorrectly adjusted intake valve clearance


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1.單項(xiàng)選擇題Which of the diesel engine cylinder liners listed has internal cooling water passages?（）

A.Internally finned liner
B.Externally finned liner
C.Wet liner
D.Integral water-jacket liner

2.單項(xiàng)選擇題Diesel engine lube oil can become contaminated as a result（）

A.the water produced during combustion
B.the sulfur in the fuel
C.unburned fuel oil
D.all of the above

3.單項(xiàng)選擇題If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）

A.early injection timing
B.worn orifices in the injection nozzles
C.worn or scored cylinder liners
D.using a fuel with too low of a cetane number

4.單項(xiàng)選擇題Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）

A.during the valve overlap period
B.with only the exhaust valve open
C.at a pressure below atmospheric
D.without cooling the cylinders or pistons

5.單項(xiàng)選擇題A diesel engine piston crown can crack from （）

A.excessive piston to liner clearance
B.excessive dirt beneath the piston crown that reduces heat transfer
C.faulty nozzle spray
D.all of the above