I need an expert's solution to the followingquestions in a simple manner, without too.much explanation1. Discuss the ratios of no load current, and starting current of threephase induction motor to its rated value?2. Explain the applications of three phase wound rotor I.M?3. Why is the starting torque increased by providing external resistanceon the wound rotor type induction motor?4. Why does an induction motor always works on lagging P.F?5. What are the advantages of adding an external resistance to the rotorcircuit of three-phase wound rotor induction motor?

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Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

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Similar questions

Name three factors that determine the torque produced by an induction motor.
L-1). The 3-phase wound-rotor induction motor has .... . a) high starting torque b) low starting current c) both "a" and "b" d) neither "a" nor "b" L-2). The 3-phase wound-rotor induction.........a) motor has a wire wound rotor b) motor's rotor can be connected to an external resistive load by way of slip rings and brushes c) motor requires more maintenance than the 3-phase squirrel-cage induction motor d) all of the above L-3). The 3-phase wound-rotor induction motor's rotor circuit's resistance should be adjusted so it is__________ during starting. a) low b) high c) either "a" or "b" d) neither "a" nor "b" L-4). Will a 3-phase wound-rotor induction motor start with no external circuit connected to its rotor leads? a) yes b) no
What is a single - phase induction motor? How does a single- phase induction motor work? How do you test a single phase motor? Which capacitor is used in single phase motor? What are the advantages of single phase induction motor? What are the applications of single phase induction motor? How does an induction motor start? What are the differences between single and three phase I.M ? What are the types of induction motor? What is the difference between induction motor and normal motor? Why three-phase induction motor self start while single phase motor does not self start?
Explain the principle of operation and constructional features of a three- phase squirrel cage and a three-phase wound rotor (slip ring) induction motor With the aid of diagrams, describe the principle of operation and constructional features of both types of induction motors. Produce a table that compares the two types of three-phase induction motors: cage motor and wound rotor motor. Your comparison should include their constructional features, connections, synchronous speed, slip, losses and efficiency, torque, and speed, starting methods.
8. Homework: III. IV. V. What is the effect of load on the efficiency of an induction motor? Explain the term air-gap power or power developed in the rotor and shaft power. How these terms are related to each other? Derive an expression for the rotor copper loss in terms of slip and input to the rotor? What are the various losses in an induction motor? On what factors do they depend? List the different types of stray load losses in an induction motor.
F-a). Single-phase repulsion motors have......... . a) excellent starting torque b) excellent running torque c) unstable speed characteristics d) all of the above F-b). Which type of repulsion motor runs quieter? a) repulsion b) repulsion-start, induction-run c) repulsion-induction d) they are all the same F-c. Single-phase repulsion-induction motors have........ . a) high starting torque b) good speed regulation c) both "a" and "b" d) neither "a" nor "b"
4) It is advisable to avoid line-starting of induction motor and use starter because: A. motor takes five to seven times its full load current B. it will pick-up very high speed and may go out of step C. it will run in reverse direction D. starting torque is very high E. starting speed is very high 5) In a three-phase induction motor, the number of poles in the rotor winding is always: A. zero B. more than the number of poles in stator C. less than number of poles in stator D. equal to number of poles in stator E. two 6) DOL starting of induction motors is usually restricted to: A. low horsepower motors B. variable speed motors C. high horsepower motors D. high speed motors A. variable torque motors
I need a solution from an expert, not a solution based on artificial intelligence, supported by a diagram, equation, or drawing exclusively. I. What is the effect of load on the efficiency of an induction motor? II. Explain the term air-gap power or power developed in the rotor and shaft power. How these terms are related to each other? III. Derive an expression for the rotor copper loss in terms of slip and input to the rotor? IV. What are the various losses in an induction motor? On what V. factors do they depend? List the different types of stray load losses in an induction motor.
What is the main difference between modern and classical induction motors?
Examine the saddle torque of induction motors and the effect of different groove structures on the saddle torque.
that impro p.1. Is more than the dec ease in current due to iner Example 34.7. A 3-phase, 400-V, star-connected induction motor has a star-connected rotor with a stator to rotor turn ratio of 6.5. The rotor resistance and standstill reactance per phase are 0.05 and 0.25 Q respectively. What should be the value of external resistance per phase to be inserted in the rotor circuit to obtain maximum torque at starting and what will be rotor starting current with this resistance?
P-1).. Which of the following determine the amount of torque produced by a single-phase split-phase motor? a) The strength of the magnetic field of the stator b) The strength of the magnetic field of the rotor c) The phase angle difference between the current in the start winding and the current in the run winding d) all of the above P-2). The phase angle difference between the currents in the start winding and run winding of a single-phase split-phase motor is typically 90 degrees. a) true b) false P-3). A centrifugal switch is used to disconnect the________ winding of a non-hermetically sealed single-phase split-phase motor at approximately 75% of rated speed. a) run b) start c) either "a" or "b" d) neither "a" nor "b" P-4). Where an internal centrifugal switch cannot be used, an external______ relay can be used to perform the same function in a single-phase split-phase motor. a) hot-wire b) current c) solid-state starting d) all of the above

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