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21. The armature voltage control is suitable if the d.c. machine is driven at a) Constant current b) Constant torque c) Constant speed d) Constant magnetic field 22. Which of the following parameter to achieve the variable speed of d.c. drive ? a) Magnetic field b) Armature resistance c) Voltage d) None of the above 23. If the speed of a d.c. shunt motor is increased, the back emf of the motor will a) Decrease b) Increase c) Remain same d) Increase then decrease

21. The armature voltage control is suitable if the d.c. machine is driven at a) Constant current b) Constant torque c) Constant speed d) Constant magnetic field 22. Which of the following parameter to achieve the variable speed of d.c. drive ? a) Magnetic field b) Armature resistance c) Voltage d) None of the above 23. If the speed of a d.c. shunt motor is increased, the back emf of the motor will a) Decrease b) Increase c) Remain same d) Increase then decrease

Introductory Circuit Analysis (13th Edition)
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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21. The armature voltage control is suitable if the d.c. machine is driven at a) Constant current b) Constant torque c) Constant speed d) Constant magnetic field 22. Which of the following parameter to achieve the variable speed of d.c. drive ? a) Magnetic field b) Armature resistance c) Voltage d) None of the above 23. If the speed of a d.c. shunt motor is increased, the back emf of the motor will a) Decrease b) Increase c) Remain same d) Increase then decrease
Transcribed Image Text:21. The armature voltage control is suitable if the d.c. machine is driven at a) Constant current b) Constant torque c) Constant speed d) Constant magnetic field 22. Which of the following parameter to achieve the variable speed of d.c. drive ? a) Magnetic field b) Armature resistance c) Voltage d) None of the above 23. If the speed of a d.c. shunt motor is increased, the back emf of the motor will a) Decrease b) Increase c) Remain same d) Increase then decrease
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