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1- To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be..... a) Reduced by 10%, b) Reduced by 20%, c) Increased by 10%, d) Increased by 20% 2- When maximum starting torque is obtained, rotor power factor is...... a) Unity, b) zero, 3- The condition for maximum running torque is.. a) R-S*X, 4- For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to... a) 400V, b) 420V, c) 480V, 5- In a 3-phase induction motor, if the supply voltage and frequency are reduced by the sanme ratio, then slip at which maximum torque occurs is.... a) More and maximum torque remains constant. b) More and maximum torque decreases. e) Less and maximum torque decreases. c) 0.707, d)0.5 b) R-X, c) R=X/2, d) nore of the above. d) 530V (+SM Sm2+sr? Sr +sr Sm 1.8 AGOV 1710 m

1- To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be..... a) Reduced by 10%, b) Reduced by 20%, c) Increased by 10%, d) Increased by 20% 2- When maximum starting torque is obtained, rotor power factor is...... a) Unity, b) zero, 3- The condition for maximum running torque is.. a) R-S*X, 4- For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to... a) 400V, b) 420V, c) 480V, 5- In a 3-phase induction motor, if the supply voltage and frequency are reduced by the sanme ratio, then slip at which maximum torque occurs is.... a) More and maximum torque remains constant. b) More and maximum torque decreases. e) Less and maximum torque decreases. c) 0.707, d)0.5 b) R-X, c) R=X/2, d) nore of the above. d) 530V (+SM Sm2+sr? Sr +sr Sm 1.8 AGOV 1710 m

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
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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1- To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be..... a) Reduced by 10%, b) Reduced by 20%, c) Increased by 10%, d) Increased by 20% 2- When maximum starting torque is obtained, rotor power factor is...... a) Unity, b) zero, 3- The condition for maximum running torque is.. a) R-S*X, 4- For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to... a) 400V, b) 420V, c) 480V, 5- In a 3-phase induction motor, if the supply voltage and frequency are reduced by the sanme ratio, then slip at which maximum torque occurs is.... a) More and maximum torque remains constant. b) More and maximum torque decreases. e) Less and maximum torque decreases. c) 0.707, d)0.5 b) R-X, c) R=X/2, d) nore of the above. d) 530V (+SM Sm2+sr? Sr +sr Sm 1.8 AGOV 1710 m
Transcribed Image Text:1- To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be..... a) Reduced by 10%, b) Reduced by 20%, c) Increased by 10%, d) Increased by 20% 2- When maximum starting torque is obtained, rotor power factor is...... a) Unity, b) zero, 3- The condition for maximum running torque is.. a) R-S*X, 4- For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to... a) 400V, b) 420V, c) 480V, 5- In a 3-phase induction motor, if the supply voltage and frequency are reduced by the sanme ratio, then slip at which maximum torque occurs is.... a) More and maximum torque remains constant. b) More and maximum torque decreases. e) Less and maximum torque decreases. c) 0.707, d)0.5 b) R-X, c) R=X/2, d) nore of the above. d) 530V (+SM Sm2+sr? Sr +sr Sm 1.8 AGOV 1710 m
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