单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?（）

A.Used of bimetallic piston rings
B.Ring gap pre-tensioning
C.Thermal increase in ring-end clearance
D.Gas pressure acting against the back of the ring