更多"Air in the fuel lines to the fuel i"的相关试题:
[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]If the needle valve in a fuel injection nozzle sticks open （）.
A. no fuel will be delivered through the nozzle
B. the nozzle will overheat and crack
C. time of injection will change
D. fuel will leak into the drain line
[单项选择]When a fuel injection nozzle overheats, which of the problems listed can be expected?（）
A. The fuel metering will vary
B. The fuel will explode
C. The cylinder head will crack
D. The engine will stop
[单项选择]Fuel injection systems meter fuel, atomize fuel, and （）.
A. create turbulence in the combustion chamber
B. aid in completing cylinder scavenging
C. inject fuel at the proper time
D. minimize fuel penetration into the cylinder
[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 of a diesel engine can cause （）
A. ignition failure
B. oxygen corrosion of the fuel lines
C. the pistons to seize
D. blue smoke
[单项选择]Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.
A. heat conduction into the injected fuel oil
B. heat conduction into the water jacket wall
C. water circulation through passages in the holder
D. fuel oil circulation through passages in the holder
[单项选择]Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause（）
A. erosion and cratering of the nozzle orifices
B. fuel leakage into the nozzle drain line
C. fuel leakage before and after injection
D. insufficient fuel delivery though that nozzle
[单项选择]A fuel-air mixture below the lower explosive limit is too（）.
A. rich to burn
B. lean to burn
C. cool to burn
D. dense to burn
[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]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]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]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
[单项选择]Fuel injection equipment must be kept in good condition, timed correctly, and the （）in each cylinder must also be carefully balanced so that individual cylinders are not overloaded.
A. MIP
B. MCR
C. MEP
D. BHP
[单项选择]The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）
A. the firing pressure in the cylinder
B. a metering helix inside the pump
C. varying the physical length of the plunger stroke
D. varying the clearance between the injector cam and the injector rocker arm
