更多"Combustion knock will most likely o"的相关试题:
[单项选择]Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
A. a shortened ignition delay period
B. a lean fuel/air mixture
C. excess fuel in the combustion chamber
D. rapid vaporization of injected fuel droplets
[单项选择]Which will most likely occur when entering shallow water? （）
A. Rudder action will become more effective
B. The vessel's list will change
C. The vessel's trim will change
D. An increase in speed will occur
[单项选择]Most troubles likely to occur with marine diesel engine can, if located in time, be remedied with no difficulty and many can be （）if the engine is maintained with a high sense of responsibility to the people on the part of the motormen and engineers.
A. found out
B. eliminated
C. avoided
D. lowered
[单项选择]Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.
A. spring，around late evening
B. spring，around early evening
C. fall，around early morning
D. fall，around midday
[单项选择]A class "C" fire would most likely occur in the （）.
A. engine room bilges
B. main switchboard
C. paint locker
D. rag bin
[单项选择]A class "B" fire would most likely occur in the （）.
A. main switchboard
B. engine room bilge
C. breathing compartment
D. electric fresh water transfer pump
[单项选择]Keel coolers fouled with marine growth, will result in （）
A. higher raw water temperatures
B. higher jacket water temperatures
C. a malfunctioning thermostat
D. higher fuel temperature
[单项选择]A diesel engine cylinder head can crack as a result of （）
A. a leaking seal ring
B. heat transfer from exhaust valves
C. restricted cooling passages
D. overheated intake valves
[单项选择]In a diesel engine, blow-by is generally the result of worn（）
A. valve guides
B. oil control rings
C. valve seats
D. compression rings
[单项选择]Spring tides occur（）.
A. at the start of spring，when the Sun is nearly over the equator
B. only when the Sun and Moon are on the same side of the Earth and nearly in line
C. when the Sun and Moon are at approximately 90°to each other as seen from the Earth
D. when the Sun，Moon，and Earth are nearly in line，in any order
[单项选择]Neap tides occur（）.
A. at the start of spring，when the Sun is nearly over the equator
B. only when the Sun and Moon are on the same sides of the Earth and are nearly in line
C. when the Sun and Moon are at approximately 90°to each other，as seen from the Earth
D. when the Sun，Moon，and Earth are nearly in line，regardless of alignment order
[单项选择]Combustion knock occurring in a diesel engine can be caused by （）
A. low coolant temperature
B. insufficient fuel
C. high ambient temperature
D. carbon buildup on the injector tips
[单项选择]A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）
A. early fuel injection
B. excessive bearing play within the running gear
C. overloading of the cylinder
D. all of the above
[单项选择]If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably （）.
A. misalignment or worn main bearings
B. insufficient cylinder lubrication
C. defective or poorly fitted valves
D. all of the above
[单项选择]Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?（）
A. Higher compression ratios create higher temperature
B. Higher temperatures create higher compression ratios
C. low temperatures create higher compression ratios
D. Higher compression ratios create low temperatures
