11.a. If an a-c system requires a 250-hp motor to drive a machine at a uniform rate of speed, what type of motor should be used? A. Induction motor B. Squirrel-cage motor C. Synchronous motor D. Wound-rotor motor 11.b. If a gear unit is used with an a-c motor to increase the speed by a ratio of 4 to 1, then the torque applied to the system is A. increased by 4 to 1. B. decreased by 2 to 1. C. increased by 2 to 1. D. decreased by 4 to 1.
11.a. If an a-c system requires a 250-hp motor to drive a machine at a uniform rate of speed, what type of motor should be used? A. Induction motor B. Squirrel-cage motor C. Synchronous motor D. Wound-rotor motor 11.b. If a gear unit is used with an a-c motor to increase the speed by a ratio of 4 to 1, then the torque applied to the system is A. increased by 4 to 1. B. decreased by 2 to 1. C. increased by 2 to 1. D. decreased by 4 to 1.
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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11.a. If an a-c system requires a 250-hp motor to drive a machine at a uniform rate of speed, what type of
motor should be used?
A. Induction motor
B. Squirrel-cage motor
C. Synchronous motor
D. Wound-rotor motor
11.b. If a gear unit is used with an a-c motor to increase the speed by a ratio of 4 to 1, then the torque
applied to the system is
A. increased by 4 to 1.
B. decreased by 2 to 1.
C. increased by 2 to 1.
D. decreased by 4 to 1.
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