I need the answer as soon as possible A series motor having a series field resistanceof 0.25 2 and an armature resistance of 0.15 52is connected to a 220 V supply and at a partic-ular load runs at 20 rev/s when drawing 20Afrom the supply. Calculate the e.m.f. gener-ated at this load. Determine also the speed ofthe motor when the load is changed such thatthe current increases to 25 A. Assume the fluxincreases by 25%.3.

In this question we will find back emf of dc series motor..

Answered: A series motor having a series field…

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 230V shunt motor has an armature resistance of 0.28Ω and a field resistance of 115Ω. At no-load, the line current is 8A and the speed is 2300rpm. What is the speed when the line current is 52A? Assume brush drops of 1V at no-load and 3V at load condition and constant flux density. 2154rpm 2212rpm 2178rpm 2155rpm
A 6-pole, 500-V wave-connected shunt motor has 1200 armatureconductors and useful flux/pole of 20 mWb. The armature and fieldresistance are 0.5 ohm and 250 ohms respectively. What will be the (a)speed and (b) torque developed by the motor when it draws 20 A from thesupply mains? If stray power losses amount to 900 W, find (c) useful torque(d) output in kW and (e) efficiency at this load.
A 200 V, d.c. shunt-wound motor has an armature resistance of 0.4 Ω and at a certain load has an armature current of 30 A and runs at 1350 rev/min. If the load on the shaft of the motor is increased so that the armature current increases to 45 A, determine the speed of the motor, assuming the flux remains constant.
Give answer as soon as possible A 200 V dc shunt motor runs at no-load speed of 1000 rpm and takes line current of2 A. When it runs at rated load, the speed of the motor reduces to 920 rpm. Ifsupply voltage is constant, then calculate the line current drawn by the motor atrated load and mechanical power developed by the motor (neglect magnetic andstray load losses).
A 4-pole series motor has 800 lap connected armature conductors. At a certain load, the flux per pole is60mWb and the total mechanical torque developed is 400 N-m. Calculate the line current taken by themotor and the speed at which it will run with a back emf of 400 V. Total motor resistance is 4 ohm.
A four-pole, three-phase induction motor rotatesat 1,700 r/min when the load is 100 N-m. The motoris 88 percent efficient.a. Determine the slip at this operating condition.b. For a constant-power, 10-kW load, determine theoperating speed of the machine.c. Sketch the motor and load torque–speed curves onthe same graph. Show numerical values.d. What is the total power consumed by themotor?
On full load a 500-volt series motor takes 100-Amp and runs at 840 rpm. The armature resistance of 0.1-ohm, field resistance 0.04-ohm. Find the speed when developing haft full load toque but with a 0.08-ohm diverter resistance parallel with the series field winding. Assume flux proportion to the field current.
A 4 pole, 220V dc shunt motor takes 32A from the supply mains and develops a power of 5.6KW in its armature. The field winding and armature resistances are 220ohms and 0.09ohm respectively. It has 540 lap wound conductors. If the flux per pole is 30mWb, calculate the torque developed in lb-ft.
A 220-V shunt motor has an armature resistanceof 0.32 Ω and a field resistance of 110Ω . At no loadthe armature current is 6 A and the speed is1,800 r/min. Assume that the flux does not vary withload, and calculatea. The speed of the motor when the line current is62 A (assume a 2-V brush drop).b. The speed regulation of the motor.
The speed of a 230 V shunt motor is to be reduced from 900 r.p.m to 600 r.p.m. Theresistance of the armature circuit is 0.3 ohm. When the motor current is 30 A, speedis 900 r.p.m. If the current reduces to 20 A at lower speed, what arrangement shouldbe made? Neglect any effect not included in the data given. (Ans.3.833 ohms)
(use 2-decimal digits for solutions) A 6-pole, 500-V. wave-connected shunt motor has 1200 armature conductors anduseful flux/pole of 20 mWb. The armature and field resistances are 0.5 Ω and 250Ω respectively. What will be the speed and torque developed by the motor when itdraws 20 A. from the supply mains? If the magnetic and mechanical losses amountto 900 W., find (a) useful torque, (b) output in kW, and (c) efficiency at this load.
a shunt-wound motor runs at 600 r.p.m from a 230 V supply when taking a line current of 50 A. its armature and Field resistance are 0.4 ohms and 104.5 ohms respectively. Neglecting the effects of armature reaction and allowing 2 V brush drop, calculate (a) the no-load speed if the no-load line current is 5 A. (b) the resistance to be placed in armature circuit in order to reduce the speed to 500 r.p.m when motor is taking a line current of 50 A . (c) the percentage reduction in the flux per pole in order that the speed maybe 750 r.p.m when the armature is 30 A with no added resistance in the armature circuit.

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