I need the complete solution. 7. In a particular d.c. machine, if P = 8, Z = 400, N = 300 r.p.m. and = 100 mWb, calculategenerated e.m.f. if winding is connected in(i) Lap fashion(ii) Wave fashion.(Ans.: (i) 200 V (ii) 800 V)8. With neat diagrams explain the phenomenon of armature reaction in a d.c. machine. Discuss itseffects.9. Develope an expression for the demagnetizing and cross magnetizing armature ampere-turns in ad.c. generator.

Step 1: Solution(7) : **(i) Lap Fashion (Winding)**1. Determine the following formula for DC machine…

Answered: 7. In a particular d.c. machine, if P =…

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 thicker wire is used in the DC series field winding than DC shunt field winding in DC machines. * O because it carries the load current. O to prevent mechanical vibrations. O to provide strength. O to produce large flux. The speed of a DC motor can be changed by varying - armature resistance circuit O flux per pole O voltage source O all of above
• A DC shunt machine while running as generator develops a voltage of 250 V at 1000 r.p.m. on no-load. It has armature resistance of 0.5 ohm and field resistance of 250 ohm. When the machine runs as motor, input to it at no-load is 4 A at 250 V. Calculate the speed and efficiency of the machine when it runs as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4 %
Under load in DC machines, the armature current will cause: a. Compensating Windings O b. Increase in the main flux Oc Armature Reaction O d. Interpoles
Topic Electrical Machines - Magnetic & E... For a coil, each turn faces (2t4 – t³ – 2t) milliwebers of flux. The value of induced EMF in coil for 100 turns coil at 2 sec is, (in Volts).
The armature reaction of DC machines is less under no load condition. Select one: O True O False
The introduction of interpoles in between the main pole improves the performance of dc machines, because .................? (A) the interpole produces additional flux to augment the developed torque (B) the flux waveform is improved with reduction in harmonics (C) the inequality of air flux on the top and bottom halves of armature is removed (D) a counter Emf is induced in coil undergoing commutation
The armature of a d.c. The machine has a resistance of 0.25 ohm and is connected to a 300V supply. Determine the e.m.f. generated when it runs as a generator giving 100 A and as a motor taking 80 A.
) A d.c. shunt machine while running as generator develops a voltage of 240 V at 1000 rp.m. on no-load It has armature resistance of 0.52 and field resistance of 250 92. When the machine runs as motor, input to it at no-load ts 4 A at 240 V. Calculate the speed and efficiency of the machine when it runs as a motor taking 40 A at 240 V. Armature reaction weakens the field by 6%
In a D.C machine, running at 450 rpm the hysteresis and eddy current losses are 300W and 150W respectively. Find the speed at which the total core loss are reduced by 35%.
Q3/ A/ Compare between de series and shunt generator. Q3/ B/ Briefly explain the commutating process in dc machine.
In DC machines, ....................... are made from laminated steel or low carbon steel and used to reduce the armature reaction.
With a labelled diagram of any DC machine Discuss it parts

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