单项选择题
A.amount of temperature rise with no load B.temperature of the compartment where the motor is located C.normal operating temperature, less the room temperature D.amount of temperature developed by an operating motor
You are attempting to parallel two AC generators and th...
单项选择题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
The need for insulation cleaning may be determined by （...
单项选择题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
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
