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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單項(xiàng)選擇題

The number of cycles per second occurring in AC voltage is known as the （）

A.phase angle
B.frequency
C.wave form
D.half mode

單項(xiàng)選擇題

Complete maintenance of electrical motors should include periodic checks for machine （）

A.vibration
B.watertight integrity
C.speed droop
D.reactive power