更多"If a diesel engines exhaust tempera"的相关试题:
[单项选择]() the engines, the diesel engine is() used engine on board.
A. Between;more commonly
B. Among;the most commonly
C. Between;not more commonly
D. Among;not the most commonly
[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]
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the ()
(1) scavenging air is cooling the exhaust gases
(2) exhaust cycle time is longer
A. (1) only
B. (2) only
C. both (1) and (2)
D. neither (1) nor (2)
[单项选择]The color of the exhaust from a diesel engine should be ()
A. clear
B. hazy light brown
C. hazy light blue
D. hazy light grey
[单项选择]The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by ()
A. regulating the level of corrosion inhibitor in the primary cooling system
B. the level of the freshwater expansion tank
C. varying the engine load to meet temperature requirements
D. the operation of the thermostatic valve
[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]A dark exhaust from a running diesel engine can be caused by ()
A. late ignition
B. water in the fuel
C. high compression temperature
D. starting valve stuck open
[单项选择]Modern engines () exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.
A. are made of
B. are made from
C. make use of
D. are used to
[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 exhaust ports of a diesel engine using the cross-flow scavenging method are opened and closed by the ()
A. reciprocating motion of exhaust valves
B. rotary motion of the camshaft
C. reciprocating motion of the piston
D. developed differential
[单项选择]The normal color of the exhaust gas of the diesel will be ()
A. achromatism or thin gray
B. thin white
C. sky-blue
D. black
[单项选择]Modem engines () exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.
A. make use of
B. have made the use of
C. by means of
D. make advantage of
[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]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]Modem engines make use of exhaust gas driven turbo-chargers to supply pressurized fresh air for () and supercharging.
A. scavenging
B. starting
C. cooling
D. blowing
[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]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]Many diesel engine exhaust valves are being constructed with hollow stems filled with sodium in order to ()
A. provide added wear protection against today’s corrosive quality of fuel
B. increase overall valve strength due to the high gas pressures
C. assist in dissipating heat due to the extreme operating temperatures
D. reduce the overall weight of the valve thus helping eliminate valve spring surge and hammering