Solve A d.c. series motor having a resistance of 1N drives a fan for which the torque variesas the square of the speed. At 220 V, the set runs at 350 r.p.m. and takes 25 A. Thespeed is tobe raised to 500 r.p.m. by increasing the voltage. Determine the necessaryvoltage and the corresponding current assuming the field to be unsaturated.

Given data: A DC series motor having, Armature resistance, Ra = 1 ohm Supply voltage, V = 220 V…

Answered: A d.c. series motor having a resistance…

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 series motor drives a load a 30rev/s and takes a current of 10A when the supply voltage is 400V. If the total resistance of the motor is 2ohms and the iron, friction and windage losses amount to 300W, determine the efficiency of the motor.
A DC series motor is running with a speed of 800 RPM, while taking a current of 20A from the supply. If the load is changed such that the current drawn by motor is increased to 50 A. Calculate the speed of the motor on new load. The armature and series field winding resistance are 0.2Ω and 0.3Ω respectively. Assume the flux produced is proportional to the current. Assume supply voltage is 250V.
An induction motor, 3phase, 60 hertz, 6-pole, 352 V, has a stator connected in delta and rotor in Y. If the speed of the rotor is 1430 and the rotor has half the number of wounds as the stator, what is the block rotor voltage per phase?
A 220 V dc machine has an armature resistance of 1ohm if the full load current is 20 A, the difference of induced voltage, when the machine is running as a motor and generator, is *
A series motor with unsaturated magnetic circuit and negligible resistance, when running at a certain speed on a given load, takes 50 Amp at 500 Volts. If the load torque varies as the cube of the speed. Find the resistance necessary to reduce the speed by 20%
A motor develops a torque of 120 lb-ft and is subjected to a 15% reduction in the field flux, which in turn resulted to 30% increase in armature current. Calculate the new torque produced as a result of this change.
A dc series motor drives a load a 30rev/s and takes a current of 10A when the supply voltage is 400V. If the total resistance of the motor is 2Ω and the iron, friction and windage losses amount to 300W , determine the efficiency of the motor ANSWER:_______________%
A 200V shunt motor develops 23hp, when taking 20.2 kW. The field resistance is 50 ohms and the armature resistance is 0.06 ohm. A. What is the total losses? a. 2512 W b. 1756 W c. 3718 W d. 3042 W B. What is are the rotational losses? a. 1125 W b. 1667 W c. 917 W d. 825 W
A de electrical shunt motor rated 50 kW connected to a 250 V supply is loaded as to draw 200 A when running at a speed of 1250 rpm. Given: R = 0.22 ohms. Determine the load torque if the rotational loss (including iron loss) is 600 W.
Calculatetheshaft power of a series motor having the following data; overall efficiency83.5%, speed 550 r.p.m. when taking 65 A; motor resistance 0.2 Ω, flux per pole 25mWb, armature winding lap with 1200 conductor.
A DC motor is initially at rest and is then connected to a 12V battery. The motor has aresistance of 2 Ohms and an inductance of 0.5 Henrys. The motor has a torque constant of0.1 Nm/A and a back EMF constant of 0.1 V/(rad/s). Determine the current through themotor as a function of time, and the time it takes for the motor to reach 90% of its finalsteady-state speed.
Calculate the torque in newton-metre developed by a 440 V dc motor having an amature resistance of 0.25 ohms and running at 750 r.p.m when taking a current of 60 A.

SEE MORE QUESTIONS

Recommended textbooks for you

Introductory Circuit Analysis (13th Edition)

Electrical Engineering

ISBN:

9780133923605

Author:

Robert L. Boylestad

Publisher:

PEARSON

Delmar's Standard Textbook Of Electricity

Electrical Engineering

ISBN:

9781337900348

Author:

Stephen L. Herman

Publisher:

Cengage Learning

Programmable Logic Controllers

Electrical Engineering

ISBN:

9780073373843

Author:

Frank D. Petruzella

Publisher:

McGraw-Hill Education

Introductory Circuit Analysis (13th Edition)

Electrical Engineering

ISBN:

9780133923605

Author:

Robert L. Boylestad

Publisher:

PEARSON

Delmar's Standard Textbook Of Electricity

Electrical Engineering

ISBN:

9781337900348

Author:

Stephen L. Herman

Publisher:

Cengage Learning

Programmable Logic Controllers

Electrical Engineering

ISBN:

9780073373843

Author:

Frank D. Petruzella

Publisher:

McGraw-Hill Education

Fundamentals of Electric Circuits

Electrical Engineering

ISBN:

9780078028229

Author:

Charles K Alexander, Matthew Sadiku

Publisher:

McGraw-Hill Education

Electric Circuits. (11th Edition)

Electrical Engineering

ISBN:

9780134746968

Author:

James W. Nilsson, Susan Riedel

Publisher:

PEARSON

Engineering Electromagnetics

Electrical Engineering

ISBN:

9780078028151

Author:

Hayt, William H. (william Hart), Jr, BUCK, John A.

Publisher:

Mcgraw-hill Education,

SEE MORE TEXTBOOKS