decreased piston to cylinder head clearance
increased exhaust system back pressure
early fuel injection timing
low scavenge air temperature
第1题：
A.Low pressure of the lubricating oil
B.Low level of the lubricating oil
C.High temperature of the lubricating oil
D.High temperature of the cooling water
第2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3题：
Fusible plugs are installed in fire-tube boilers to _____.
A.provide a means of draining the boiler
B.warn the engineer of low water level
C.cool the crown sheet at high firing rates
D.open the burners electrical firing circuits
第4题：
to reduce heat stress
to reduce low temperature corrosion
to improve firing and starting performance
fuel saving
第5题：
Generally speaking, with ______ the weather becomes cloudy or overcast with strong winds.
A.high pressures
B.low pressures
C.weak pressures
D.strong pressures
第6题：
High firing pressures and low exhaust temperature in a diesel engine may resultfrom( ).
A.decreased piston to cylinder head clearance
B.increased exhaust system back pressure
C.early fuel injection timing
D.low scavenge air temperature
第7题：
A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.
A.corrosion at low engine loads
B.erosion at high engine loads
C.overload at high engine loads
D.scaling at all exhaust temperatures
第8题：
High cylinder firing pressure, accompanied by low exhaust temperature, can result from ___.
A.improper fuel rack positing
B.lengthy exhaust valve duration
C.extend operation at light load
D.excessively early injection timing
第9题：
Improper fuel rack positioning
Lengthy opening of the exhaust valve
Excessively early injection timing
Extended light load operation
第10题：
lower than normal cylinder pressure and low exhaust temperature
lower than normal cylinder pressure and high exhaust temperature
higher than normal cylinder pressure and low exhaust temperature
higher than normal cylinder pressure and high exhaust temperature