Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 36, Problem 7SQ
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Explain why the starting cycle can persist for a long time with an increase in the motor load.
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1- What is the starting torque developed by a split-phase or a capacitor start
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4.a. The device which responds to the heat developed within the motor is theA. shading coil.B. short-circuiter.C. bimetallic protector.D. current-operated relay.4.b. How is a rotating magnetic field produced during starting in a split-phase motor?A. A capacitor is inserted in the auxiliary-winding circuit.B. A low resistance coil is placed around a portion of each pole.C. Brushes are shifted off the hard-neutral position.D. An auxiliary winding is made with a high ratio of resistance to reactance.
What is the reason why a synchronous motor can be found running at no load?
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
- 1. Explain the working Principle of Single Phase Induction Motor. 2. What are the different types of Starters to control AC-Motor. Explain briefly. 3. Explain DOL starter of Single Phase Induction Motor briefly. 4. What is the purpose of the magnetic contactor? 5. What is the use of auxiliary contact in the magnetic controller? 6. What happens when the holding coil gets the supply in the magnetic controller? 7. Explain the working principle of a relay.arrow_forwardWhat are the advantages of a mechanically held relay?arrow_forward(B)- Indicate whether the following statements are true or false and correct the false statements 1- Wave wound armature has two parallel paths. 2- The current ratio is equal to 1/ turn ratio at no-load while the voltage ratio is equal to 1/ turn ratio at full load 5.4. 3-When a series de motor is operated without a load, the armature draws excessive current Ph 4- The hysteresis loss can be minimized by using core of thin laminations ل لهول 259 Ne 02arrow_forward
- What is the factor that enables the synchronous motor to operate at different electrical load characteristics? explain.arrow_forwardWhich is the answer for Question 12?arrow_forwardOverhauling is a condition in which the motor’s armature rotates ( ] than the rotating stator field. A) more slowley B) more rapidlyarrow_forward
- Q1. Answer the following question briefly (not more than 4 lines) Why the rotor conductors of the squirrel cage rotor are short-circuited and in the case of slip-ring induction motors, the rotor circuit is closed through resistors? Q2. A -3-phase, 8-pole induction motor is required to be operated at about 700 rpm. If supply frequency is 60 Hz, determine its actual speed if slip is 5%. *arrow_forwardWhy induction motor cannot run on synchronous speed? Explain using slip.arrow_forwardYou are working as a plant electrician. You are told that a large DC motor was returned from the rewind shop and was installed on the previous shift. The motor seemed to operate properly until load was added. The motor then stopped, reversed direction, and began to run at high speed. What is the probable cause of the trouble, and what would you do to correct the problem? Explain your answer.arrow_forward
- 1- What causes a three-phase motor to run backwards? 2- How we can reverse the direction of the induction motor? 3- What are the advantages of changing the direction of an induction motor for a 3-phase? 4- What is a forward reversing motor control circuit? 5- What is the application of the forward and reverse motor? 6- Why do we change the direction of the rotation of a 3-phase induction motor?arrow_forwardPlease write text, not handwritingarrow_forwardExplain why synchronous motor doesn’t have any self-starting torque. Demonstrate some measures to make it self-starting. Please dont copyarrow_forward
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