更多"The process of supplying a diesel e"的相关试题:
[单项选择]In the cylinder of a diesel engine fuel is ignited by the（）
A. spark from a plug in the pre-combustion chamber
B. electrical discharge from the distributor
C. heat of compression within the cylinder
D. heat from the fuel injection nozzle
[单项选择]Valves in the cylinder head of a diesel engine are opened by the direct action of the（）
A. exhaust pressure
B. valve spring pressure
C. rocker arm movement
D. wrist pin movement
[单项选择]Scuffed cylinder liner surfaces in a diesel engine can result form（）
A. starting the engine hot
B. knurling the piston skirt
C. operating an overheated engine
D. using scuff resistant piston rings
[单项选择]Which of the diesel engine cylinder liners listed has internal cooling water passages?（）
A. Internally finned liner
B. Externally finned liner
C. Wet liner
D. Integral water-jacket liner
[单项选择]Why are some diesel engine cylinder liners plated on the wearing surface with porous chromium?（）
A. The chromium will not wear out the piston rings
B. The chromium strengthens the liners in the way of the scavenging air ports
C. Chromium eliminates the need for oil scraper rings
D. Pores in the plating aid in maintaining the lube oil film
[单项选择]All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are lowWhich of the following situations is responsible for this condition?（）
A. Excessively early injection timing
B. Combustion knock
C. Leaking piston rings
D. Light load
[单项选择]Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.
A. low compression pressure
B. increased piston wear
C. increased cylinder lube oil consumption
D. poor contact between compression rings and liner
[单项选择]A sudden drop in diesel engine cylinder compression pressure can be caused by（）
A. a leaking fuel injector nozzle
B. a clogged air filter
C. excessively early fuel injection
D. malfunctioning valves
[单项选择]Fuel oil discharged to the diesel engine cylinder is atomized at the （）
A. turbocharger
B. injection nozzle tip
C. carburetor
D. fuel oil pump
[单项选择]For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）
A. chemical analysis
B. back pressure readings
C. pyrometer readings
D. infrared analysis
[单项选择]The highest pressure in a diesel engine cylinder normally occurs （）.
A. at TDC
B. before TDC
C. after TDC
D. during air starting
[单项选择]Air scavenging of a diesel engine cylinder（）
A. blows out the exhaust gases
B. supplies oxygen for combustion
C. cools the valves and cylinder walls
D. all of the above
[单项选择]The bore of a diesel engine cylinder describes the （）
A. swept volume of the cylinder
B. inside diameter of the cylinder
C. piston displacement in the cylinder
D. length of the piston stroke
[单项选择]When fuel is injected in a diesel engine cylinder too early, （）
A. ignition may be delayed
B. fuel economy is not affected
C. exhaust gas temperature will be unchanged
D. the exhaust will be clear
[单项选择]Fuel is admitted to a diesel engine cylinder through the （）.
A. intake valves
B. carburetor
C. exhaust ports
D. injector nozzles
[单项选择]Diesel engine cylinder head test cocks are used to（）
A. check cylinder lubrication prior to starting engine
B. connect exhaust gas analyzers to determine engine efficiency
C. pressure test cylinder heads to check for leaks
D. remove moisture accumulations from cylinder prior to starting
[单项选择]
In a diesel engine, excessive cylinder liner wear will cause （）
Ⅰ.increased blow-by
Ⅱ.wear between the piston ring and groove
A. Ⅰonly is correct
B. Ⅱ only is correct
C. both Ⅰ and Ⅱ are correct
D. neither Ⅰ or Ⅱ are correct
[单项选择]In the starting process of a diesel engine, the main object is to attain the compression conditions sufficient to （）
A. turn the flywheel
B. reduce friction
C. overcome inertia
D. ignite the fuel
[单项选择]If the relief valve on a diesel engine cylinder lifts, the cause could be due to （）
A. liquid in the cylinder
B. low compression in the cylinder
C. high exhaust temperature
D. poor fuel penetration
