Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 39, Problem 14SQ
Induction motors and welding transformers require magnetizing current, which causes
- a. lagging power factor.
- b. leading power factor.
- c. unity power factor.
- d. zero power factor.
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Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and 1800 rpm. Each winding has an armature resistance of 0.05Q and a synchronous reactance of 0.6Q. Draw the phasor diagram with values, show torque angle and determine the induced voltage for the condition of rated load.
2. Describe the Torque-Slip characteristics of a three phase induction motor.
Chapter 39 Solutions
Electric Motor Control
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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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
- Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction motor? Explain your answer.arrow_forwardThe rotor resistance and standstill reactance of a 3-phase induction motor are respectively 0.015 ohmsand 0.09 ohms / phase. At normal voltage, the full-load torque at the full-load speed. b.) Calculate thepower factor.arrow_forwardQ2)A. Explain compound DC generator, also describe its types and terminal characteristics of compound DC generator. proper explanation and diagramarrow_forward
- Draw the Terminal Characteristics of the following Generators. (i)Shunt DC Generator (ii)Series DC Generator (iii)Compound DC Generator ( Show the curves for over - compounded, flat compounded and under - compounded)arrow_forwardIn a long shunt DC generator, Shunt winding is parallel with the Series filed winding and Armature winding of the DC generator. Select one: True Falsearrow_forwardIV. What are the various losses in an induction motor? On what actors do they depend?arrow_forward
- A short shunt compound DC generator supplies a load current of 10A at a voltage of 10 volts. If the resistance of armature, shunt field and series field windings are 0.001 ohm, 1 ohm 0.00 ohm respectively. a) Draw the the figure. And find the generated voltage.arrow_forwardAnswer the followinga. Differentiate Synchronous and Induction Generator.b. Why the construction of induction generator is less complicated thatof the synchronous generator.c. Why is there a separate DC excitation for alternator?arrow_forwarda) Why the slip of induction motor is never zero, b) What happens if the slip of induction motor is one, c)What is the value of the slip for an induction motor at no load and full load.arrow_forward
- A short shunt compound DC generator supplies a load current of 10A at a voltage of 10 volts. If the resistance of armature, shunt field and series field windings are 0.001 ohm, 1 ohm 0.00 ohm respectively. c) write down the factors to improve the generated voltage.arrow_forwardA short shunt compound DC generator supplies a load of 10A at a voltage of 10 volts. If the resistances of Armature, shunt field and series field windings are 0.01 ohm, 1 ohm and 0.00 ohm respectively. c) Write down the factors to improve the generated voltage.arrow_forwardList the different types of stray load losses in an induction motor.arrow_forward
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