更多"The cetane number rates fuels for d"的相关试题:
[单项选择]The cetane number of a diesel fuel oil indicates its（）
A. Viscosity
B. acid content
C. heating value
D. ignition quality
[单项选择]The Total Base Number (TBN) value of diesel engine lube oil refers to its ability to （）
A. resist changes in viscosity with changes in temperature
B. resist emulsification
C. neutralize acids
D. resist oxidation at high temperatures
[单项选择]The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.
A. principle
B. principal
C. cause
D. case
[单项选择]Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the （）, then a saving in fuel can be achieved.
A. BHP
B. MCR
C. IHP
D. MEP
[单项选择]When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）
A. the amount of lube oil additives increase
B. piston speeds increase
C. injection pressure decrease
D. engine speeds decrease
[单项选择]Diesel oil may be used to cool （） of a diesel engine.
A. cylinders
B. exhaust valves
C. pistons
D. fuel valves
[单项选择]Fuels of high quality with their earlier ignitions will cause higher （）pressure in cylinders of a diesel engine.
A. compression
B. maximum
C. rated
D. oil
[单项选择]All of these alternatives are carbon-based fuels（）molecules are smaller and simpler than those of gasoline.
A. which
B. who
C. what
D. whose
[单项选择]A substance found in residual fuels which tends to cause exhaust valve corrosion and grooving, is（）
A. carbon
B. vanadium
C. calcium
D. hydrogen
[单项选择]On the other hand, alternative fuels do have（）.
A. drawbacks
B. setback
C. drawer
D. backward
[单项选择]Diesel fuel vapors （）.
A. can not be ignited by a spark unless the vapor is in a confined space
B. are nontoxic in all concentrations
C. can not be ignited by a spark unless they are at their auto-ignition temperature
D. are heavier than air
[单项选择]An emergency diesel generator should automatically shut down in the event of （）
A. dangerous over-speeding
B. a loss of lube oil pressure
C. activation of the fixed CO2 system for the emergency generator space
D. all of the above
[单项选择]Diesel engine crankshaft deflection readings are generally taken at four crank positionsGood engineering practice requires the deflection gage or indicator to be（）
A. placed as near the crankpin axis as possible
B. removed each time the crankshaft is repositioned
C. left in place for all four readings
D. reset to zero for all four readings
[单项选择]An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）
A. restricted turbocharger air intake
B. oil leak into the turbocharger
C. dribbling injector
D. low fuel viscosity
[单项选择]Constant cooling the various components of diesel engine has a number of functions except for （）.
A. good lubrication
B. low thermal stress
C. good mechanical properties
D. acid corrosion
[单项选择]High diesel engine cooling water temperatures can be caused by （）.
A. a worn water pump
B. not enough coolant
C. air in the cooling system
D. all of the above
[单项选择]The satisfactory operation of diesel engine exhaust valves usually depends on（）
A. the proper back pressure
B. the cooling water temperature
C. correct timing and proper seating
D. accurate metering and the exhaust temperature
[单项选择]To successfully reduce an excessively high diesel engine exhaust gas temperature, you should （）.
A. reduce the engine driven fuel pump outlet pressure
B. retard the fuel injector timing to reduce power
C. increase the fuel rack setting
D. reduce the load on the engine
