更多"A diesel engine will lose power if "的相关试题:
[单项选择]A diesel engine will lose power if fuel injection occurs too early because the （）
A. fuel will not be properly atomized in the cylinder
B. ignition will be delayed due to low ignition temperature
C. maximum fuel expansion will occur on the compression stroke
D. fuel will ignite before top dead center
[单项选择]In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with（）
A. low firing pressure
B. low exhaust temperature
C. mechanical knock in each cylinder
D. fuel knock in each cylinder
[单项选择]In an ordinary diesel engine the fuel injection begins （）
A. after TDC
B. before TDC
C. after BDC
D. before BDC
[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]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 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
[单项选择]Late fuel injection in a diesel engine is indicated by low firing pressure with（）
A. high exhaust temperature
B. low exhaust temperature
C. fuel knock in each cylinder
D. mechanical knock in each cylinder
[单项选择]The rate of fuel injection in a diesel engine cylinder depends primarily on （）.
A. the size of the holes in the fuel nozzle
B. timing of the pump
C. supply pressure to the pump
D. shape of the combustion chamber
[单项选择]Late fuel oil injection in a diesel engine can result in （）
A. fuel knock
B. increased power
C. low compression pressure
D. high exhaust temperature
[单项选择]The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the （）
A. camshaft
B. crankshaft
C. governor
D. flywheel
[单项选择]Diesel engine injection lag is caused by（）
A. compressibility of the fuel
B. high fuel oil supply flow
C. scored plunger and barrel packing
D. excessive air turbulence
[单项选择]Injection lag in a diesel engine may be caused by（）
A. a higher cetane number of fuel oil
B. the diesel fuel used having a high viscosity
C. mechanical rigidity in the lube pump mechanism
D. a decrease rigidity in the fuel pump delivery pressure
[单项选择]In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）
A. is coming upward；cylinder ring belt
B. is going downward；piston ring belt
C. is coming upward；piston ring belt
D. is going downward；cylinder ring belt
[单项选择]The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and （） of the pistons in the cylinders.
A. crack
B. knocking
C. leaking
D. seizure
[单项选择]In a common rail engine, the fuel is injected into cylinders（）
A. by injection pumps
B. at a time decided by the injection pump timing
C. by a signal opening the magnetic valves
D. at a time decided by the cam directly
