AC Theory & Electric Motors Exam Review questions with answers

AC Theory & Electric Motors Exam Review
questions with answers


At what frequency does AC power in your house run at? - ....🔰VERIFIED
ANSWERS.... ✔✔60 Hz


What is used in a rectifier circuit after the diodes to help smooth out the DC
power? - ....🔰VERIFIED ANSWERS.... ✔✔A capacitor


Inductors oppose change in _____ - ....🔰VERIFIED ANSWERS.... ✔✔Current


At what degree is one phase to another if one phase is at peak voltage while the
other is at zero? Both phases have the same magnitude and frequency. - ....🔰
VERIFIED ANSWERS.... ✔✔180 degrees


Shunt DC electric motors have the field windings wound in _____ - ....🔰
VERIFIED ANSWERS.... ✔✔Parallel


What wiring configuration runs a 3 phase AC induction motor at about 63% of
its full rated voltage/power - ....🔰VERIFIED ANSWERS.... ✔✔Star


Resistance in a AC circuit is called - ....🔰VERIFIED ANSWERS....
✔✔Impedance

, NEMA stands for: - ....🔰VERIFIED ANSWERS.... ✔✔National Electrical
Manufacturers Association


A polyphase synchronous motor has three stator windings that are _____.
- ....🔰VERIFIED ANSWERS.... ✔✔120 degrees apart


What is another term for RMS voltage? - ....🔰VERIFIED ANSWERS....
✔✔Effective voltage


What is one of the hardest things for an electric motor to do repeatedly over
time? - ....🔰VERIFIED ANSWERS.... ✔✔Start & Stop


Field windings provide ______ for electric motors - ....🔰VERIFIED
ANSWERS.... ✔✔Magnetism


What is the RMS voltage if the Peak voltage is 600 VAC? - ....🔰VERIFIED
ANSWERS.... ✔✔424 Volts


______ tend to be small and quiet running motors - ....🔰VERIFIED
ANSWERS.... ✔✔Permanent Magnet DC Motor


What happens when a motor is turned on? - ....🔰VERIFIED ANSWERS....
✔✔A large rush of electrical current occurs


What is the RMS voltage if the Peak voltage is 480 VAC? - ....🔰VERIFIED
ANSWERS.... ✔✔339 volts