更多"The exhaust system for a turbocharg"的相关试题:
[单项选择]The exhaust system for a turbocharged diesel engine functions to （）
A. power the after-coolers
B. power the turbocharger
C. reduce the cylinder scavenge effect
D. cool the turbocharger
[单项选择]Exhaust system的中文含义是（）。
A. 排气系统
B. 进气系统
C. 转向系统
D. 燃油喷射系统
[单项选择]（） are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder.
A. Diffusers
B. Compressors
C. Steam boilers
D. Soot blowers
[单项选择]In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）
A. increased engine back pressure
B. sulfuric acid corrosion
C. surface pitting of the turbocharger
D. moisture impingement on the turbocharger compressor blade
[单项选择]The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）
A. provide exhaust back pressure
B. prevent exhaust smoke emissions
C. power a reciprocating supercharger
D. muffle exhaust gas noise
[单项选择]The mechanical exhaust valve operation system is replaced by（）in an electronic controlled ME engine.
A. a system with a Hydraulic Power Supply (HPS) unit
B. a system with roller guides for exhaust valves
C. a system with an electronically controlled Alpha Lubricator
D. a system directly powered by electric motor
[单项选择]In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）
A. improper venting of the cooling system
B. carrying the expansion tank water level too high
C. a totally clogged impeller in the cooling water pump
D. an incorrectly set cooling system temperature control
[单项选择]By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）
A. tachometer
B. pyrometer
C. dynamometer
D. calorimeter
[单项选择]Exhaust pipes for separate diesel engines can be combined only when （）
A. space limitations prevent separately run pipes
B. the engines are small auxiliary units
C. they are arranged to prevent gas backflow to each engine
D. a waste heat boiler is installed
[单项选择]If exhaust temperatures are too high, you should check （）.
A. air cooler
B. turbocharger
C. charge air
D. A+B+C
[单项选择]（） the oxygen content in the exhaust gas, （） the combustion is.
A. The lower；the worse
B. The higher；the better
C. The lower；the better
D. The highest；the worst
[单项选择]An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）
A. restricted turbocharger air intake
B. oil leak into the turbocharger
C. dribbling injector
D. low fuel viscosity
[单项选择]Performance of a turbocharged engine can be improved by（）
A. decreasing the amount of valve overlap
B. preheating the air intake
C. after-cooling the intake air
D. preheating light fuel
[单项选择]Clearance volume 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
[单项选择]When the load is increased on a turbocharged diesel engine, the amount of increased air supplied by the turbocharger will（）
A. lag behind the increased fuel supplied to the engine
B. enter the engine along with the increase in the fuel
C. enter the engine before the increased fuel supply
D. leave the turbocharger as a negative pulse
[单项选择]In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）
A. governor droop
B. speeder spring tension
C. fuel rack lag
D. load on the engine
[单项选择]Poor quality fuel being used in a turbocharged medium-speed, diesel engine could result in （）
A. hard starting
B. excessive fuel consumption
C. loss of power
D. all of the above
[单项选择]After-cooling of a turbocharged diesel engine will result in （）
A. higher torque but lower brake horsepower
B. lower torque but higher brake horsepower
C. higher torque and lower brake horsepower
D. lower torque and higher brake horsepower
