单项选择题
A.visual inspection for dirt accumulation B.high megger readings C.low operating temperature D.the time period since the last cleaning
Voltage will always lead current in a/an （）A.capacitive...
单项选择题Voltage will always lead current in a/an （）
A.capacitive circuit B.inductive circuit C.magnetic circuit D.resistive circuit
The number of cycles per second occurring in AC voltage...
单项选择题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
Complete maintenance of electrical motors should includ...
单项选择题Complete maintenance of electrical motors should include periodic checks for machine （）
A.vibration B.watertight integrity C.speed droop D.reactive power
