A.pitting
B.sludge
C.hard varnish
D.all of the above
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A.increase ignition delay
B.affect fuel oil metering
C.affect engine performance at low speed
D.only disappear due to fuel oil abrasion
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
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
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
A.must be centrifuged
B.must by filtered
C.must be changed
D.is holding finely dispersed carbon in suspension
最新試題
Which of the following items don’t belong to dock repair works?（）
The condensers located in various stages of a flash evaporator are cooled by（）
Using a file without a handle may result in （）
Cold weather starting of a diesel engine may be made easier by（）
For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
Under MARPOL Code the ship to which it applies has to carry （）