Q5- A)- Select the correct answer for the alternatives given 1- Wave windings are used in d.c machine designed for what type of application? a) High voltage low current d-c generator, b) Low voltage high current d-c generator (d) Low voltage low torque d-c motor c) Low voltage high torque d-c motor, 2- A 220V shunt motor develops a torque of 54 Nm at an armature current of 10 A. The torque developed when the armature current is 20 A is a) 81 Nm., b) 108 Nm. c) 216 Nm. d) 270 Nm. 3-A d.c. shunt motor is running with certain load. The effect of adding an external resistance in field circuit is to a) reduce the motor speed b) increase the motor speed, c) stop the motor d) reduce the armature current of the motor 4- An 8-pole lap wound dc shunt generator is supplying 295 A to load. The field current of generator is 5A. The current parallel path is a)-300A b)- 150A, c)- 37.5A d)-36.5A 5- The electrical power developed by the armature of ad.c. motor is equal to a) Power input minus losses b) Power output multiplied by efficiency c) Power output plus iron losses d) Armature current multiplied by back emf

Q5- A)- Select the correct answer for the alternatives given 1- Wave windings are used in d.c machine designed for what type of application? a) High voltage low current d-c generator, b) Low voltage high current d-c generator (d) Low voltage low torque d-c motor c) Low voltage high torque d-c motor, 2- A 220V shunt motor develops a torque of 54 Nm at an armature current of 10 A. The torque developed when the armature current is 20 A is a) 81 Nm., b) 108 Nm. c) 216 Nm. d) 270 Nm. 3-A d.c. shunt motor is running with certain load. The effect of adding an external resistance in field circuit is to a) reduce the motor speed b) increase the motor speed, c) stop the motor d) reduce the armature current of the motor 4- An 8-pole lap wound dc shunt generator is supplying 295 A to load. The field current of generator is 5A. The current parallel path is a)-300A b)- 150A, c)- 37.5A d)-36.5A 5- The electrical power developed by the armature of ad.c. motor is equal to a) Power input minus losses b) Power output multiplied by efficiency c) Power output plus iron losses d) Armature current multiplied by back emf

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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Q3 A - Why the de shunt motor running at the infinity speed? B – Discuss the difference between D.C shunt motor and D.C series motor at load.
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Q2 A DC shunt motor is connected to a 220 V supply. Figurel below shows the time/current characteristics with a resistance starter. If armature resistance is 0.12 0, a) What is the maximum current that is flowing in the armature at the instant of starting? b) What is the minimum current in the armature? c) How many sections does this starter resistance have? Show your work. d) Calculate the required starter resistance required to limit the current to the maximum value. 270 162 13 t.
A hybrid stepper motor has four stator poles and two 5-pole permanent magnet armatures, as shown in Figure Q3. A1 armature 1 armalure 2 A2 Figure Q3 Describe how the motor can be excited by a two-phase source to rotate in the counterclockwise direction.
The armature winding of 200 V 4-pole series motor is lap connected. There are 280 slots and each slot has 4 conductor, The armature current is 45 A and the flux per pole is 18 mwb. The field resistance is 0.3 ohm. Armature resistance is 0.5 ohm and the iron and mechanical losses are 800 W. find the shaft (output) torque.
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Q4 A 220 V shunt motor has an armature resistance of 0.5 N and take armature current of 40 A at full-load. By how much must the main flux be reduced to raise the speed by 50 % if the developed torque is constant?
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List down 3 main parts of DC motor
Report 1- Sketch speed (y-axis) torque (x-axis) characteristics of compound DC motor for three connections on the same sheet and discuss the graphs. 2- Sketch armature current (y-axis) torque (x-axis) characteristics of compound DC motor for three connections on the same sheet and discuss the graphs 3- Calculate the efficiency of d.c. motor for each connection. 4- Plot the efficiency (y-axis) against Im (x-axis) for each connection. 5- Give your comments about the results obtained in this experiment 6- Mention the applications of each type of motor?