單項(xiàng)選擇題A ground can be defined as an electrical connection between the wiring of a motor and its（）.

A.shunt field
B.circuit breaker
C.metal framework
D.inter-pole


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1.單項(xiàng)選擇題Brushless generators are designed to operate without the use of（）.

A.brushes
B.slip rings
C.commutators
D.all of the above

2.單項(xiàng)選擇題It （） for an emergency generator to require paralleling.

A.is usual
B.is not usual
C.is necessary
D.is not impossible

3.單項(xiàng)選擇題Usually the panels are interlocked with （） so that the devices can be made dead before the doors are opened.

A.protective earth
B.isolators
C.ground switch
D.circuit-breakers

4.單項(xiàng)選擇題In （） the control action is independent on(of) the output.

A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear control system

5.單項(xiàng)選擇題This arrangement is （） if the elements are directly connected to one another and the control action takes place without human involvement.

A.a manual closed loop
B.a manual opened loop
C.an automatic closed loop
D.an automatic opened loop