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AC Theory & Electric Motors Exam Review Questions with Answers, Exams of Electrical and Electronics Engineering

Trident Technical CollegeElectrical and Electronics Engineering

A comprehensive set of review questions and answers covering key concepts in ac theory and electric motors. It covers topics such as ac power frequency, rectifier circuits, inductors, phase angles, dc motor windings, 3-phase ac induction motors, impedance, nema standards, synchronous motors, rms voltage, motor starting and stopping, field windings, permanent magnet dc motors, in-rush current, variable frequency drives, and more. Suitable for students studying electrical engineering or related fields.

Typology: Exams

2024/2025

Available from 01/15/2025

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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
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Download AC Theory & Electric Motors Exam Review Questions with Answers and more Exams Electrical and Electronics Engineering in PDF only on Docsity!

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

How many degrees apart are each phase in a 3-phase electrical service? - .... 🔰 VERIFIED ANSWERS.... ✔✔ 120 degrees What does it mean by "running a motor in the mud? - .... 🔰 VERIFIED ANSWERS.... ✔✔ You are running the motor too slow If the phase angles of two sine waves are both 0 degrees, then the waves _____. - .... 🔰 VERIFIED ANSWERS.... ✔✔ Are 90 degrees out of phase A device that uses electromagnetic induction to transfer electrical energy from one circuit to another is a(n) _____. - .... 🔰 VERIFIED ANSWERS.... ✔✔ Transformer ______ motors have great positional accuracy and holding strength - .... 🔰 VERIFIED ANSWERS.... ✔✔ Stepper motor What is the Peak voltage if the RMS voltage is 120 volts? - .... 🔰 VERIFIED ANSWERS.... ✔✔ 170 volts The opposing force that an inductor presents to the flow of alternating current is called_____. - .... 🔰 VERIFIED ANSWERS.... ✔✔ Inductive reactance If the time for one cycle is 0.05, what is the frequency in Hz? (Hz = cycles/sec) - .... 🔰 VERIFIED ANSWERS.... ✔✔ 20 Hz

What does RMS voltage stand for relating to AC theory - .... 🔰 VERIFIED ANSWERS.... ✔✔ Root mean square DC motors generally have good _____ - .... 🔰 VERIFIED ANSWERS.... ✔✔ High end torque What is the rotating part of an electric motor referred to as?

  • .... 🔰 VERIFIED ANSWERS.... ✔✔ Armature(rotor) How does a variable frequency drive simulate an AC sinusoidal wave? - .... 🔰 VERIFIED ANSWERS.... ✔✔ Pulse width modulation Polyphase induction motors are inherently self starting. True or False - .... 🔰 VERIFIED ANSWERS.... ✔✔ True What is the Peak voltage if the RMS voltage is 208 volts? - .... 🔰 VERIFIED ANSWERS.... ✔✔ 339 volts Capacitors oppose change in _____ - .... 🔰 VERIFIED ANSWERS.... ✔✔ Voltage When an electric motor first starts up, an in-rush current can be ________ - .... 🔰 VERIFIED ANSWERS.... ✔✔ 4 to 6 times greater than its normal running state