更多"Persistent knocking in one cylinder"的相关试题:
[单项选择]Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）
A. low loading of that cylinder
B. faulty combustion in that cylinder
C. sluggish piston ring action
D. excessive piston cooling
[单项选择]Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）
A. increase engine power
B. increase engine load
C. decrease engine power
D. improve fuel economy
[单项选择]Each cylinder has one starting valve which is usually opened by air pressure and closed by （）
A. nuts and bolts
B. new joints
C. spring force
D. sealing rings
[单项选择]One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）
A. crankcase
B. piston
C. cylinder liner
D. crank cheek
[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]White smoke exhausting from an operating diesel engine may indicate （）
A. a cracked liner
B. burning lube oil
C. an overloaded engine
D. insufficient combustion air
[单项选择]Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）
A. water in the fuel
B. insufficient fuel for combustion
C. clogged air intake passages
D. burning lubricating oil
[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]According to the principle of two stroke diesel engine, what is the number of its efficient work stroke per revolution?（）
A. 1/2
B. 1
C. 2
D. 3
[单项选择]Water accumulating in the crankcase of a diesel engine could indicate（）
A. a cracked cylinder liner
B. excessive water in the fuel
C. a leaking intercooler
D. excessive moisture in the scavenge air
[单项选择]Water accumulation in the cylinder of a secured engine is an indication that the （）
A. soft water pump was not secured along with the engine
B. jacket water thermostat has failed
C. cylinder liner may be cracked
D. raw water pump is over-speeding just prior to engine shutdown
[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]A properly honed diesel engine cylinder liner will（）
A. prevent piston ring wear
B. shorten the ring break-in period
C. prevent cylinder liner glazing
D. appear slick and glazed
[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]Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）
A. increase back pressure during the exhaust process
B. facilitate periodic replacement of the valves
C. reduce the pumping loss associated with scavenging
D. reduce tension on valve springs
[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
