A 3-4 induction motor is wound for 4 poles and is supplied from 50-Hz system. Calculate:A. the synchronous speedB. the rotor speed, when slip is 4% andC. rotor frequency when rotor runs at 600 rpm

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Answered: A 3-4 induction motor is wound for 4…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

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6- Which of the following supply is given to the rotor winding of 3-Phase Induction Motor: a) DC Supply b) AC Supply c) No Supply d) Pulsating Supply 7- 3-Phase Induction Motor will have Starting Torque and Starting Current a) High, High b) Low, Low. c) High, Low d) Low, High 8- Which of the following method is used for controlling the speed of an induction motor: a) Changing number of stator poles b) Supply voltage control c) Frequency control d) All the options are correct 9- Which of the following method cannot be used for starting of 3-Phase Squirrel Induction Motor: a) Star-Delta Starting b) Line resistor startling c) transformer Starter d) Rotor Resistance Starting 10- The rotor of a stepper motor has no: a) windings b) commutator c) brushes d) all of the above
26. A 4-pole, 50 Hz induction motor operates at 5% slip. The frequency of e.m.f. induced in the rotor will be .... (1) 25 Hz (iii) 2.5 Hz (ii) 50 Hz (iv) none of the above
A 60-Hz induction motor runs at 860 r/min at full load. Determine a. the synchronous speed, b. the frequency of the rotor currents Note: Number of poles are 8.
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A three –phase, 440V, 50 Hz, 6 – pole induction motor running at 950 rpm takes 50 kW at certain load. The friction and windage loss is 1.5 kW and the stator losses = 1.2 kW. Determine the output from the rotor. (a). 42.68 kW (b). 46.48 kW (c). 48.80 kW (d). 44. 86 kW
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A 3-4 induction motor is wound for 4 poles and is supplied from 50-Hz system. Calculate: A. the synchronous speed B. the rotor speed, when slip is 4% and C. rotor frequency when rotor runs at 600 rpm