Answered: A13 The back e.m.fof a d.c. motor is…

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Electrical Engineering

A13 The back e.m.fof a d.c. motor is V-la Ra. (TRUE/FALSE)

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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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

A13
The back e.m.fof a d.c. motor is V-la Ra.
(TRUE/FALSE)

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Below is a diagram of a DC motor and the mechanical load connected to it. Which statement is wrong? A. The speed of the motor ea increases with increasing B. The torque of the motor increases with increasing ia C. eb increases and speed decreases D. if increasing. the torque of the motor increases E. None
Shunt motor 250 V Ra-0,03 ohm, Rt-50 ohm and II-120 A, The armature current= Select one O a 120 A O b. 115A O C. 125A Od 110A YE o Y.
Flame proof type DC motor is cooled by spraying water. Select one: O True O False
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200V d.c shunt moter takes 4A at no-Load when ab F00 rap-m. The field Yesistance is 100.2.The resistance of the armature Yuning at stand still gives adrop of 6 Volt a crass armature terminals when t0 A were passed through it Calculate (i) the speed, on load (i) the amature Čii) efficiency torque The normal imput of motor is 8 kwe
Q2\ A d.c. shunt motor runs at a speed of 1000 r.p.m on no load ,taking a current of 6 A from the supply ,when connected to 220V d.c. supply. Its full load current is 50 A calculate its speed on full load . Assume R, = 0.3 2, R= 110 Q.
ANSWERE FAST PLEASE QUESTION from book ELECTRIC MACHINE-1 LAB BASESD QUESTION i. A variable resistive load of (0-1K) ohm is connected across the DC shunt motor. What willbe the load characteristics in this case? What will be the effect of N on torque? Given thefollowing table of observations. ii. If the same load is connected across the DC shunt generator, what will be the difference.Explain using drawing.
Q4 A 440 V shunt motor has armature resistance of 0.8 2 and field resistance of 200 2. Determine the back e.m.f. when giving an output of 7.46 KW at 85% efficiency. Q5 A 20 KW, 250 V d.c. shunt generator has armature and field resistance of 0.1 Q and 125 2 respectively. Calculate the total armature power developed when running i) as a generator delivering 20 KW output (ii) as a motor taking 20 KW input.
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Subject = Electric Machines