更多"（） are fitted in the exhaust system"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]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 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 diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）
A. prevent engine back pressure at heavy loads
B. increase total engine efficiency at low loads
C. prevent boiler corrosion at low engine loads
D. improve engine fuel consumption at any load
[单项选择]The exhaust system for a turbocharged two-stroke/cycle diesel engine functions to（）
A. discharge exhaust gases and smoke
B. furnish energy to the turbocharger
C. reduce engine room noise
D. all of the above
[单项选择]Additional heat extraction from the exhaust gases can be effected by adding an （） section to the unit in plants.
A. air cooler
B. economizer
C. injector
D. air blower
[单项选择]High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.
A. engine overload
B. low combustion temperature
C. plugged fuel nozzle holes
D. excessive compression pressure
[单项选择]Pyrometers commonly found on diesel engine exhaust systems, consist of（）
A. pyrostats and a voltmeter
B. a gas-filled bellows, a tube and a pressure gauge
C. thermocouples and a voltmeter
D. ammeters and thermocouples
[单项选择]Exhaust pyrometer readings provide an indication of the （）
A. effectiveness of water-cooled exhaust elbows
B. distribution of the load between engine cylinders
C. amount of fuel penetration into the engine cylinders
D. indicated horsepower of the engine cylinders
[单项选择]Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）
A. jam in the most worn part of the cylinder when the rings expand
B. break in the most worn part of the cylinder when the rings expand
C. wear eccentrically on the side opposite the end gap
D. overheat and jam at the top center on the combustion stroke
[单项选择]The rising of the exhaust temperature in manifold pipe may NOT result from （）.
A. too great a loading
B. fouled turbocharger
C. bad combustion
D. excessive air
[单项选择]
The exhaust valve opens before bottom dead center in a four stroke engine to（）
Ⅰ.allow for blow down
Ⅱ.Reduce pumping losses
A. Ⅰ only
B. Ⅱ only
C. both Ⅰ and Ⅱ
D. neither Ⅰ nor Ⅱ
[单项选择]A smoking exhaust from an operating diesel engine could be caused by （）
A. low sulfur content in the fuel
B. a loose injector inlet connection
C. late fuel injection
D. high injection pressure
[单项选择]Icreasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening （）
A. later and closing earlier
B. later and closing later
C. earlier and closing earlier
D. earlier and closing later
[单项选择]Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）
A. natural aspiration
B. masked intake valves
C. air cells
D. scavenging air
[单项选择]Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）
A. increase back pressure during the exhaust process
B. facilitate periodic replacement of the valves
C. reduce the pumping loss associated with scavenging
D. reduce tension on valve springs
[单项选择]High firing pressures and a low exhaust temperature in a diesel engine may result from （）.
A. decreased piston to cylinder head clearance
B. increased exhaust system back pressure
C. early fuel injection timing
D. low scavenge air temperature
