更多"The rising of the exhaust temperatu"的相关试题:
[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]If a diesel engines exhaust temperature is abnormally high, the cause could be（）
A. too light of a load
B. injection timing is too early
C. overloading of the engine
D. too low of a compression ratio
[单项选择]
Exhaust temperature increases in all cylinders, the possible cause may be（）
(1) increased scavenging air temperature
(2) air in fuel pumps and fuel valves
(3) fouling of air and gas passages
A. (1)+(2)
B. (1)+(3)
C. (2)+(3)
D. (1)+(2)+(3)
[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]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]The (auto)ignition temperature is that temperature atwhich（）.
A. no spark or flame is required to ignite gas or vapor
B. a fuel begins to give off explosive vapors
C. a fuel if ignited will continue to burn
D. a 1% mixture of the fuel with air will explode
[单项选择]An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.
A. decrease in maximum cylinder pressure
B. increase in ignition lag
C. decrease in fuel consumption per horsepower-hour
D. decrease in exhaust manifold pressure
[单项选择]The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually（）
A. greater than the average exhaust manifold pressure
B. less than the average exhaust manifold pressure
C. greater at the turbine wheel than at the impeller
D. greater at reduced engine speed
[单项选择]If one of the bilge system manifold valves does not properly seat, the （）
A. bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied
B. bilge system will lose vacuum and prevent the other bilges from being pumped out
C. bilge well aft connected to that valve will siphon its contents to the forward bilge wells
D. discharge pressure will be too high
[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]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]
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]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]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
