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
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