Q2: The armature and field resistance of a 220 V DC series motor is 0.15 ohm and 0.1 ohm respectively. It runs at a speed of 1000 rpm when connected to rated voltage drawing a current of 30 A. If an external resistance of 1 ohm is inserted in series with the motor, calculate the new steady state armature current and the speed. Assume the torque is proportional to the square of the speed (To N)

Q2: The armature and field resistance of a 220 V DC series motor is 0.15 ohm and 0.1 ohm respectively. It runs at a speed of 1000 rpm when connected to rated voltage drawing a current of 30 A. If an external resistance of 1 ohm is inserted in series with the motor, calculate the new steady state armature current and the speed. Assume the torque is proportional to the square of the speed (To N)

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...

See similar textbooks

Similar questions

A DC motor with a shunt field winding has the following characteristics: Vr = 96.0 V R = 1.50 Q K = 0.352 m Specify the flux required to achieve a starting torque of 18 Nm.
A 3-phase 50 Hz I.M. has a rated torque = 16.7 N.M and maximum torque = 40.5 N.M. If its rated speed = 910 R.P.M, the speed at :maximum torque will be R.P.M 578.280 R.P.M 421.640 R.P.M 590.160 None O
Question4 A 120-V series motor runs at 2000 rpm at full load and takes a current of 12A. The armature resistance is 0.3 ohms and the series field resistance is 0.2 ohms. A diverter resistance of 0.2 ohms is connected across the series field, and the load on the motor is adjusted. If the motor now takes 20A, what is the new speed of the motor, determine the torque developed in each case.
A DC motor should be operated in a strong field which is due to the What happens to if suddenly goes a) nothing, it continues rotating b) it over speeds c) it stops rotating current if moter if rotating to zero. as before
A240 V d.c. series motor takes 40 A when giving its rated output at (500 r.p.m.its total resistance is 0.32.Find what resistance must be added to obtain rated torque i) At starting
Question A dc series motor with a resistance between terminals of 1 0, runs at 800 rpm from a 200 V supply taking 15 A. If the speed is to be reduced to 475 rpm for the same supply voltage and current the additional series resistance to be inserted would be approximately
None
A motor’s rotor spins at 1,000 rpm when no load is applied (i.e. torque = 0), but reduces to 900rpm when the rated torque of 2.3 N-m is applied. Determine the speed regulation and output horsepower at the rated load condition. If the motor’s input power is 500 Watts at the rated load condition, what is the efficiency?
a 220 V dc shunt motor has armature resistance 0.23 ohm, on load it takes armature current 40 A and turnes at 720 rpm, if the flux of motor is reduced by 10% without changing the load torque . Find the new speed of the motor.