A.series circuit
B.grounded circuit
C.short circuit
D.closed circuit
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A.means of rheostat the governor settings
B.a balance coil excitation
C.adjusting the governor settings
D.changing excitation
A.shunt
B.high-resistance coil in the armature circuit
C.low-resistance coil in the armature circuit
D.shunt and a coil of high resistance
A.minimum
B.maximum
C.leading
D.lagging
A.undercutting
B.sanding
C.burnishing
D.filing
A.reduce current pulsations
B.reduce brush chatter
C.prevent uneven commutator wear
D.allow greater power generation
最新試題
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
The shipboard oil pollution emergency plan will be invalid after （）
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
Diesel engine air start system check valves are opened by （）
“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）
The cetane rating of diesel fuel is an indication of the （）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.