reduce engine exhaust noise
reduce engine back pressure
increase engine cycle efficiency
increase turbocharger efficiency
第1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2题：
To prevent internal damage form local overheating
To ensure the fuel nozzles are flushed clean
To clear the smoke stack
To let the waste heat boiler reduce its rate of steam generation
第3题：
A.boiler
B.separator
C.incinerator
D.treatment lological sewage
第4题：
prevent engine back pressure at heavy loads
increase total engine efficiency at low loads
prevent boiler corrosion at low engine loads
improve engine fuel consumption at any load
第5题：
Receives saturated steam from the generating tubes
Serves as a reservoir of boiler feed water
Holds internal fittings for separation of moisture from steam
Collects steam exhausted from the turbines
第6题：
not；but
neither；nor
either；or
not only；but also
第7题：
Control of evaporation
A separate means to prevent feed-water contamination
Power circulating pump
Super-heater
第8题：
The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ______.
A.gas composition
B.gas temperature
C.pressure
D.timing
第9题：
bypass exhaust gas at high loads to prevent excessive back pressure
bypass a portion of the exhaust gas at peak loads for better efficiency
recycle exhaust gas to the turbocharger
minimize moisture condensation in the boiler gas passages at low loads
第10题：
operating the boiler at less than normal water level
installing fins on the firesides of water-tubes
increasing the amount of excess air to the burners
treating the boiler water with chemical oxygen scavengers