更多"Fuel injection systems meter fuel, "的相关试题:
[单项选择]Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?（）
A. Common-rail injection
B. Air injection
C. Jerk pump injection
D. Distribution injection
[单项选择]During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.
A. ensure penetration and distribution of the fuel in the combustion chamber
B. ensure the needle valve is flushed clean during each injection
C. prevent combustion gas blowback into the open needle valve
D. prevent reflected pressure waves when the needle valve closes
[单项选择]Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.
A. lower compression pressures
B. overheating without smoking
C. failure to start
D. a run away without load
[单项选择]The main source of fuel injection system malfunctions is （）
A. improper adjustments
B. contaminated fuel
C. coated fuel lines
D. excessive vibration
[单项选择]Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.
A. cold corrosion of the nozzles
B. fuel viscosity for better atomization
C. carbon accumulation on the nozzles
D. fuel detonation in the cylinders
[单项选择]When ship is fouled, increasing the fuel injection for keeping the normal speed will cause the main engine （）
A. to work as overload characteristic
B. overspeed
C. over mechanical load only
D. over thermal load only
[单项选择]Late fuel injection in a diesel engine is indicated by low firing pressure with （）
A. low exhaust temperature
B. low exhaust pressure
C. mechanical knock in each cylinder
D. black or gray exhaust smoke
[单项选择]Early fuel injection timing is indicated by the cylinder pressure being（）
A. above normal with a below normal exhaust temperature
B. above normal with a normal exhaust temperature
C. below normal with a normal exhaust temperature
D. below normal with an above normal exhaust temperature
[单项选择]The high pressure in fuel injection system of the diesel engine is produced by the （）.
A. injector pump
B. fuel injector
C. governor
D. turbocharger
[单项选择]A diesel engine will lose power if fuel injection occurs too late in the cycle, because the（）
A. fuel droplets will burn as they leave the fuel injector
B. fuel will not be properly atomized in the cylinder
C. maximum expansion of the burned fuel cannot take place in the cylinder
D. compression pressure will be too low to cause fuel ignition
[单项选择]The major cause of fuel pump and injection system problems is （）
A. improper adjustments
B. contaminated fuel
C. kinked fuel lines
D. excessive engine vibration
[单项选择]Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.
A. water in the fuel oil supply
B. excessive fuel nozzle holder cooling
C. a distorted fuel spray pattern
D. leakage past the plunger into the oil drain
[单项选择]Problems with the diesel engine fuel injection pump are usually caused by（）
A. improper adjustment
B. contaminated fuel
C. kinked fuel lines
D. excessive engine vibration
[单项选择]Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.
A. intake stroke
B. exhaust stroke
C. power stroke
D. compression stroke
[单项选择]Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）
A. employing fuel oil as a cooling medium
B. preventing hard carbon deposit on nozzle tips
C. avoiding fuel oil temperature exceeding builder’s specification
D. ensuring good metallic contact between nozzles and cylinder heads
[单项选择]The sequence of fuel injection into cylinders is determined by （）.
A. the steering
B. the driven gear
C. the turning gear
D. the timing gear
