Author: Anonymous

Counter-electromotive force (CEMF) and back-EMF are names for the voltage induced into the armature of a DC motor.

In a compound DC motor control circuit, the field loss relay will disconnect the _____ if power is lost to the _____.

A device that converts electrical energy into mechanical energy is called a(n) _____.

Permanent magnet motors have _____ efficiency than conventional field-wound motors.

The speed of the disc servomotor can be varied by changing the amount of voltage supplied to the armature. The voltage is generally varied using _____.

The compound motor connection that should generally be avoided is the _____.

Small permanent magnet motors that have lightweight rotors are often used as _____.

A square wave voltage varies between 0 V and 12 V. The positive pulses are 75 μs wide and there is a 25 μs gap between them. What is the DC average of the waveform?

A square wave voltage varies between 0 V and 12 V. The positive pulses are 25 μs wide and there is a 75 μs gap between them. What is the DC average of the waveform?

A square wave voltage varies between 0 V and 12 V. The positive pulses are 50 μs wide and there is a 50 μs gap between them. What is the DC average of the waveform?