單項(xiàng)選擇題

You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow directionThis indicates that the frequency of the incoming machine is （）.

A.higher than the bus frequency
B.lower than the bus freouencv
C.the same as the bus frequency but out of phase with it
D.the same as the bus frequency, and the circuit breaker may be closed at any pointer position

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單項(xiàng)選擇題

The need for insulation cleaning may be determined by （）

A.visual inspection for dirt accumulation
B.high megger readings
C.low operating temperature
D.the time period since the last cleaning

單項(xiàng)選擇題

Voltage will always lead current in a/an （）

A.capacitive circuit
B.inductive circuit
C.magnetic circuit
D.resistive circuit

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You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow directionThis indicates that the frequency of the incoming machine is （）.

你可能感興趣的試題

The need for insulation cleaning may be determined by （）

Voltage will always lead current in a/an （）

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