Answered: K-1)The speed of a 3-phase wound-rotor…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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K-1)The speed of a 3-phase wound-rotor induction motor can be changed by varying the amount of resistance in the rotor circuit.
a) true b) false
K-2). Which of the following statements are true about a 3-phase synchronous motor?
a) It is a constant speed motor even under varying loads. b) It runs at the same speed the magnetic field rotates on the stator. c) It can correct its own, and the supply line's power factor d) all of the above
K-3. A) What determines the speed of a 3-phase synchronous motor?
a) the number of poles b) the frequency of the supply c) both "a" and "b" d) neither "a" nor "b"
K-3)B) From a technician's standpoint, which of the following is the most practical method of providing a wide range of speed control for a 3-phase synchronous motor?
a) by changing the frequency b) by changing the number of poles c) both "a" and "b" d) neither "a" nor "b"

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