單項(xiàng)選擇題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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題Diesel engine injection lag is caused by（）

A.compressibility of the fuel
B.high fuel oil supply flow
C.scored plunger and barrel packing
D.excessive air turbulence

3.單項(xiàng)選擇題Abnormal crankpin bearing and piston skirt surface wear indicate（）

A.a restricted air intake
B.a clogged connecting rod oil passage
C.incorrect connecting rod alignment
D.high cylinder firing temperatures

4.單項(xiàng)選擇題Injection lag in a diesel engine may be caused by（）

A.a higher cetane number of fuel oil
B.the diesel fuel used having a high viscosity
C.mechanical rigidity in the lube pump mechanism
D.a decrease rigidity in the fuel pump delivery pressure

5.單項(xiàng)選擇題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