A.shunt field
B.circuit breaker
C.metal framework
D.inter-pole
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A.brushes
B.slip rings
C.commutators
D.all of the above
A.is usual
B.is not usual
C.is necessary
D.is not impossible
A.protective earth
B.isolators
C.ground switch
D.circuit-breakers
A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear control system
A.a manual closed loop
B.a manual opened loop
C.an automatic closed loop
D.an automatic opened loop
最新試題
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
If separating effect is not good, which measure should be taken （）
Which of the following items don’t belong to dock repair works?（）
Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
Flame failure in an automatically fired auxiliary boiler can from a/an （）
Using a file without a handle may result in （）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.