A.Polyphase
B.Wound-rotor
C.Induction
D.Synchronous
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A.kilowatts
B.ampere-turns
C.kilowatt-volts
D.kilovolt-amperes
A.neutralize armature reaction
B.conduct electric current to an outside circuit
C.convert DC current to AC current
D.provide excitation to a DC generator
A.Open the machine on both ends so as to allow the air and dust to escape
B.Be certain that the circuit breaker is opened and tagged on the feeder panel
C.Be certain that the air is clean and as dry as possible
D.All of the above
A.higher than that of copper
B.lower than that of copper
C.equal to that of copper
D.reached when the conductor it is protecting becomes "white hot"
A.low voltage battery
B.motor attenuator set
C.DC exciter generator
D.AC supply
最新試題
Diesel engine air start system check valves are opened by （）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
The shipboard oil pollution emergency plan will be invalid after （）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
The main purpose of port State control is not to（）
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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
For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）