M1. Which of the following is the preferred method of changing the direction of rotation of a DC compound motor? a) by reversing the direction of current flow in the armature conductors b) by reversing the polarity of the magnetic field poles c) either "a" or "b" d) neither "a" nor "b M2. If the resistance of a DC motor's shunt-field circuit is increased, what happens to the speed of the motor? a) it speed decreases b) it stays the same c) it speed increases d) none of the above M3. What is a common method of controlling the speed of a DC shunt motor? a) by adding rheostat in series with the armature b) by adding rheostat in series with the shunt field c) could be either "a" and "b" d) neither "a" nor "b"
M1. Which of the following is the preferred method of changing the direction of rotation of a DC compound motor? a) by reversing the direction of current flow in the armature conductors b) by reversing the polarity of the magnetic field poles c) either "a" or "b" d) neither "a" nor "b M2. If the resistance of a DC motor's shunt-field circuit is increased, what happens to the speed of the motor? a) it speed decreases b) it stays the same c) it speed increases d) none of the above M3. What is a common method of controlling the speed of a DC shunt motor? a) by adding rheostat in series with the armature b) by adding rheostat in series with the shunt field c) could be either "a" and "b" d) neither "a" nor "b"
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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M1. Which of the following is the preferred method of changing the direction of rotation of a DC compound motor?
a) by reversing the direction of current flow in the armature conductors b) by reversing the polarity of the magnetic field poles c) either "a" or "b" d) neither "a" nor "b
M2. If the resistance of a DC motor's shunt-field circuit is increased, what happens to the speed of the motor?
a) it speed decreases b) it stays the same c) it speed increases d) none of the above
M3. What is a common method of controlling the speed of a DC shunt motor?
a) by adding rheostat in series with the armature b) by adding rheostat in series with the shunt field c) could be either "a" and "b" d) neither "a" nor "b"
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