單項選擇題Which of the listed conditions can cause a diesel engine to use too much lube oil?（）

A.Dirty lube oil filter
B.Too much piston ring wear
C.High lube oil viscosity
D.Low lube oil temperature


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1.單項選擇題Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）

A.The oil oxidizes and forms carbon deposits
B.The viscosity increases
C.Engine oil consumption decreases
D.Lubricating qualities of the oil are enhanced

2.單項選擇題The oxidation by-products forming in diesel engine lube oil can cause （）

A.pitting
B.sludge
C.hard varnish
D.all of the above

3.單項選擇題Surface irregularities, such as erosion and pitting on injection pump plungers, will（）

A.increase ignition delay
B.affect fuel oil metering
C.affect engine performance at low speed
D.only disappear due to fuel oil abrasion

4.單項選擇題Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because （）

A.oil foaming will occur
B.large quantities of oil are consumed
C.lube oil viscosity is always decreased
D.corrosive by-products are usually formed

5.單項選擇題When disassembling or assembling an injection pump plunger and barrel you should （）

A.keep the parts immersed in diesel fuel
B.always keep the plunger and barrel together
C.work over a linoleum-type surface
D.all of the above