更多"A drop in compression pressure in o"的相关试题:
[单项选择]A sudden drop in compression pressure in one cylinder of a diesel engine 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]When one cylinder has a lower compression pressure and higher exhaust gas temperature than any of the other engine cylinders, which of the conditions listed will indicated?（）
A. Advanced ignition
B. Clogged air intake
C. Leaky exhaust valve
D. High exhaust pressure
[单项选择]Low cylinder compression pressure and a high exhaust temperature may indicate （）
A. early fuel injection timing
B. leaking valves
C. a continuously open scavenge air port
D. low cooling water temperature
[单项选择]When a diesel engine compression pressure is checked, the indicator is connected to the （）
A. cylinder exhaust ports
B. injection line
C. cylinder indicator cock
D. banjo oiler line
[单项选择]Low compression pressure in a diesel engine may be the result of （）
A. insufficient fuel supply due to fuel pump valves sticking or leaking
B. excessive mechanical clearance between the piston crown and cylinder head
C. excessively worn fuel pump plunger
D. excessive exhaust back pressure
[单项选择]Low compression pressure in a diesel engine is caused by（）
A. low water in the expansion tank
B. improperly seated valves
C. low fuel oil pressure
D. worn or broken cylinder liner sealing rings
[单项选择]Low compression pressure in a diesel engine can be caused by（）
A. improperly seating intake valves
B. leaking cylinder liner seal rings
C. late fuel injection timing
D. carbon deposits on the piston
[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]The diffuser prevents pressure pulses from one cylinder （） another during operation.
A. to interfere with
B. interfering with
C. to help scavenging
D. helping scavenging
[单项选择]A pressure drop through the refrigerant liquid line may cause （）.
A. solenoid valve to seize
B. compressor to hunt
C. formation of flash gas in the liquid line
D. expansion valve to freeze open
[单项选择]A pressure drop in the liquid line of a refrigeration system may cause（）
A. the solenoid valve to seize
B. the compressor to hunt
C. flash gas to form in the liquid line
D. the expansion valve to freeze open
[单项选择]High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）
A. improper fuel rack positing
B. lengthy exhaust valve duration
C. extend operation at light load
D. excessively early injection timing
[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]The evaporating pressure in R22 vapor compression refrigeration plant should be （） atmospheric.
A. below
B. above
C. equal to
D. much larger than
[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]A number of cylinder liners are enclosed in one cast iron casing to form a （）.
A. cylinder cover
B. cylinder block
C. cylinder frame
D. bed-plate
[单项选择]A knocking sound from one cylinder of an operating air compressor indicates （）.
A. a defective or broken high pressure un-loader
B. a loose valve plate
C. excessive overload
D. no compression
[单项选择]Persistent knocking in one cylinder of a diesel engine could be caused by（）.
A. a low load on that cylinder
B. sluggish piston ring action
C. excessive piston crown cooling
D. excessive clearance of piston pin
