FOSITYPASSAGEChoose the correct option.(MarkscayEvaluate the no load speed at 3% slipAssuming arı induction motor which is warking at supply frequency of 50 Hz ac supplyand having 6 poles. The slip of Induction motor at no load is 3% and at full load is 6%.Then selecting appropriate the value of slip determine following:OPTIONS960 rpm980 rpm970 rpm950 rpmSKIPhp

Given:Induction motorf=50 HzP=6s=3% or.03

PASSAGE Choose the correct option.(Marksc) Evaluate the no load speed at sip Assuming ari induction motor which is working at supply frequency of 5o Htz ac supply and having 6 poles, the slip of Induction motor at no load is 3% and at full load is 6% Then selecting appropriate the value ofr slip determine following: OPTIONS 960 rpm 980 rpm 970 rpm 950 rpm

PASSAGE Choose the correct option.(Marksc) Evaluate the no load speed at sip Assuming ari induction motor which is working at supply frequency of 5o Htz ac supply and having 6 poles, the slip of Induction motor at no load is 3% and at full load is 6% Then selecting appropriate the value ofr slip determine following: OPTIONS 960 rpm 980 rpm 970 rpm 950 rpm

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A 10 kW, 250V shunt motor has an armature resistance of 0.5ohm and a field resistance of 200ohm. At no load and rated voltage, the speed is 1200 rpm and the armature current is 3A. At full load and rated voltage, the current line is 47A and because of armature reaction, the flux is 4% less than it no load value. (a.) What is the full load speed? (b.)What is the developed torque at full load? 1158 rpm
A) At what percentage of slip is the pull-out or breakdown torque of a typical 3-phase squirrel- cage induction motor reached? 21. a) 3% slip b) 10% slip c) 20% slip d) none of the above B) If load is increased beyond the breakdown torque, what happens to the speed of the motor? a) it stops b) it may speed up beyond its rated rpm c) its speed will not change, but its current will go down d) none of the above
g) What is an advantage if the starting Torque of the induction motor is higher than the nominal load Torque? h) What are the main differences when the equivalent circuits of transformer and asynchronous motor are examined?
When the speed of the dc motor is varied by changing the armature resistance, is to be held constant. O field flux O applied voltage O load current O armature current The starting torque of a three phase slip ring induction motor is to a three phase squirrel cage induction motor. when compared O very low O low same O high
A four-pole, three-phase induction motor drives a turbine load. At a certain operatingpoint the machine has 4 percent slip and 87 percent efficiency. The motor drives aturbine with torque–speed characteristic given by TL = 20 + 0.006ω2,where TL is theload torque at the shaft. Determine:(1) the torque at the motor-turbine shaft.(2) the total power delivered to the turbine.(3) the total power consumed by the motor.
Which of the following statement is correct for the causes of low power factor? O The power factor of induction motor falls with the decrease of load. O Most of the induction motors operate at leading power factor. O Arc lamps operate at high power factor. O The induction furnaces operate on high power factor.
1. The rotor resistance and reactance per phase of a three-phase wound rotor induction motor are 0.035 and 0.15 ohm respectively. If an additional resistance is added, the starting torque is one half of maximum torque and the full load torque is three-fourth of the maximum. Determine the following: a. Full load speed b. speed at maximum torque c. value of additional resistance per required to achieve these conditions.
An 8-pole, 50 Hz, 3-phase induction motor has a full-load slip 2.5% and maximum torque of twice the full-load torque. At what value of slip does the maximum torque occur? Ans[0.093]
A 3 phase, 1500 rpm, 2200 V, star connected synchronous motor has an impedance of 0.4+j90 per phase. At some excitation 2900 V is induced in the armature. Find the maximum torque developed by motor before the motor breaks out of synchronism. Also find the load angle this time.
A 240 V, 60 Hz, Delta connected, 870 r.p.m., Eight poles, Three-Phase Induction Motor has the following per phase parameters: R1 = 0.07, R2 = 0.05, X1 = X2 = 0.2, Xm = 6.5, Draw the approximate equivalent circuit and determine the following: I. Starting Torque Maximum Torque II. I. Rated Torque IV. Stator Current V. Power Factor VI. Input Power VII. Rotor Current VIII. Magnetizing Current IX. Stator copper loss Х. Rotor copper loss
1. The rated current of 15 hp, 220V separately excited DC motor is- a) 50.87A b) 60.2 A c) 40.31A 2. If the load torque T₁ of induction motor proportional to square of the rated speed, what will be the value of load torque if the motor speed reduces to half rated speed. a) 2-TL. 3. In stator voltage control strategy of induction motor, the variable stator voltage will be: a) above rated voltage b) below than rated voltage e) above and below rated voltage