Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 36, Problem 3SQ
Does reversing the secondary rotor leads mean that the direction of rotation will reverse?
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8. What happens to the magnitude of the magnetic
field on the Rotor when an induction machine
speed increases closer to synchronous speed?
the rotor speeding up has on effect on the
magnetic field on the rotor
the rotor speeding up increases the magnetic
field on the rotor
the rotor speeding up decreases the magnetic
field on the rotor
The frequency of the rotor current fr = - 40 Hz with a slip of -0.667. What happens in the motor if the rotor frequency is negative?
In which type of induction motor, external resistance can be connected?
squirrel cage
Slip ring
capacitor start
capacitor start and run
Chapter 36 Solutions
Electric Motor Control
Ch. 36 - Are the secondary resistors connected in three...Ch. 36 - Do secondary resistors on starters with three or...Ch. 36 - Does reversing the secondary rotor leads mean that...Ch. 36 - If one of the secondary resistor contacts (S2)...Ch. 36 - In Figure 362, how many different interlocking...Ch. 36 - Referring to Figure 364, why is it not possible to...Ch. 36 - Prob. 7SQCh. 36 - If there is a locked rotor in the secondary...Ch. 36 - Why is it necessary to remove the jumpers in...Ch. 36 - Prob. 10SQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- There may be more than one answerarrow_forwarda. Explain how a rotating magnetic field is produced in a three-phase induction motor. b. Explain the rotor action on a three-phase squirrel cage motor when the load increases from NO-LOAD to rated FULL- LOADarrow_forwardWhat are the following statements are true for a three-phase induction motor? I. Three-phase induction motor stator winding is fed from a single-phase supply II. Stator carries a three-phase winding III. Rotor carries a short circuited winding a. I,II and III b. I only c. I and II only d. II and IIIarrow_forward
- Compare between cylindrical rotors and salient pole rotors?arrow_forwardWhat effect does increasing rotor circuit resistance have on the breakdown torque and on slip at which breakdown occurs.arrow_forward4- An induction Motor is a) Self-starting with high torque c) Self-starting with low torque 5- In three-phase squirrel-cage induction motors a) Rotor conductors are kept open b) Rotor conductor ends are short-circuited through slip rings c) Rotor conductors are short-circuited through end rings d) Rotor conductors are connected to insulation b) Self-starting with zero torque d) Not self-startingarrow_forward
- The break operation of the I.M. at speed less than synchronous speed is: OWhen rotor rotates in the same direction of the rotating field. OThe rotor rotates in opposite direction to the rotating field. OThe rotor is open circuited.arrow_forwardThe Voltage across any two slip rings of a slip ring induction motor at standstill is 100 V. If the rotor resistance per phase is 0.42, what is the approximate value of rotor current if the rotor is rotating at a slip of 4%?arrow_forwarddo.arrow_forward
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