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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

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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

單項(xiàng)選擇題

The frequency of an alternator is controlled from the main switchboard by adjusting the（）

A.frequency meter
B.voltage regulator
C.governor control
D.sychroscope switch

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