更多"Diesel engine injection lag is caus"的相关试题:
[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]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]Low compression in a diesel engine could be caused by（）
A. worn or broken cylinder liner sealing rings
B. high cooling water temperature
C. worn or broken piston rings
D. low fuel oil pressure
[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 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]Poor combustion in a diesel engine can be caused by （）.
A. high compression pressure
B. low intake air temperature
C. low exhaust pressure
D. high scavenge air temperature
[单项选择]Low compression in a diesel engine can be caused by （）
A. clogged coolant passages
B. a leaking cylinder head gasket
C. low fuel oil pressure
D. worn or broken cylinder liner sealing rings
[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]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]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]Diesel engine piston seizure can be caused by （）
A. poor cooling of cylinder walls
B. improper cooling of the piston
C. insufficient piston lubrication
D. all of the above
[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
