更多"Diesel engine air start valve timin"的相关试题:
[单项选择]If the engine does start on air, but combustion does not immediately begin, the cause may be （）.
A. failure of the fuel pumps
B. starting air pressure too low
C. stop valve in air line closed
D. the turning gear still engaged
[单项选择]If the engine does not start on air, it may be due to （）
A. low compression of the fuel pumps
B. incorrect timing of fuel pumps
C. the starting air valves stuck
D. air-locks in fuel oil pipeline
[单项选择]Diesel engine air start system check valves are opened by （）
A. an air start cam
B. cylinder compression pressure
C. starting air pressure
D. valve springs
[单项选择]The timing of diesel engine air starting valves is controlled by（）
A. the air start valve timing gears and rods
B. a cylinder check valve
C. individual cams and valve gear
D. an air manifold poppet valve
[单项选择]In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.
A. downwards；upwards
B. upwards；downwards
C. downwards；downwards
D. upwards；upwards
[单项选择]To avoid scavenge fires （） the engine timing and equipment maintenance should be correctly carried out.
A. occurred
B. occurring
C. not happening
D. occur
[单项选择]For an ordinary four-stroke engine the inlet valves open （）
A. after TDC
B. before TDC
C. after BDC
D. before BDC
[单项选择]When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its（）
A. suction stroke
B. compression stroke
C. power stroke
D. exhaust stroke
[单项选择]In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.
A. pressure charged
B. naturally aspirated
C. contaminated
D. high speed diesel
[单项选择]Worn diesel engine intake valve guides can result in （）
A. increased engine breathing efficiency
B. excessive valve lash
C. excessive lube oil consumption
D. lower than normal fuel consumption
[单项选择]With Variable Injection Timing the start of injection may be （）as the engine load is reduced.
A. advanced
B. retarded
C. kept constant
D. none of the above
[单项选择]Diesel engine valve springs function to （）
A. hold the valves open
B. keep the valves off their seats until the exhaust stroke is completed
C. close the valves
D. open inlet valves when the air injection cycle begins
[单项选择]If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）
A. backfire through the air intakes
B. develop less power under load
C. have high firing pressures
D. lift its cylinder relief valves
[单项选择]The diesel engine valve subjected to most severe conditions of service is the （）.
A. cylinder exhaust valve
B. air starting valve
C. air inlet valve
D. cylinder relief valve
[单项选择]The humidifier’s valve of air-condition should be （）, when the temperature is lower than 0℃.
A. decreased
B. increased
C. fixed
D. closed
[单项选择]The humidifier’s valve of air-conditioner should be （）, when the temperature is 5~8°C in the winter.
A. decreased
B. increased
C. fixed
D. closed
[单项选择]Before starting an engine by air, the engine must（）
A. be turned by a turning gear for at least one minute
B. be turned by a turning gear for at least two minutes
C. be turned at least one complete turn
D. be turned at least two complete turns
