The non-rotating part of a revolving-field-type alternator is called the _____.
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The motor that does not contain a wound armature, commutator…
The motor that does not contain a wound armature, commutator, or brushes is the _____ motor.
Counter-electromotive force (CEMF) and back-EMF are names fo…
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…
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 ene…
A device that converts electrical energy into mechanical energy is called a(n) _____.
Permanent magnet motors have _____ efficiency than conventio…
Permanent magnet motors have _____ efficiency than conventional field-wound motors.
The speed of the disc servomotor can be varied by changing t…
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 avoid…
The compound motor connection that should generally be avoided is the _____.
Small permanent magnet motors that have lightweight rotors a…
Small permanent magnet motors that have lightweight rotors are often used as _____.
A square wave voltage varies between 0 V and 12 V. The posit…
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?