单项选择题

To （） , the power is supplied by main switchboard directly not though sub-board.

A.save network cost
B.improve the reliability of supplying power to important load
C.prevent sequence reverse
D.increase the power factor of important load

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单项选择题

（）is not installed on the main switchboard.

A.Ammeter and changeover switch
B.Power factor meter
C.Synchroscope
D.Reverse sequence relay

单项选择题

（）is used to control, modulate, monitor and protect generator set.

A.Control panel
B.Load panel
C.Paralleling panel
D.Busbar

单项选择题

（）is not a part of the main switchboard.

A.Busbar
B.Load panel of main generator
C.Paralleling panel
D.Shore connection box