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7. In a particular d.c. machine, if P = 8, Z = 400, N = 300 r.p.m. and = 100 mWb, calculate generated 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 its effects. 9. Develope an expression for the demagnetizing and cross magnetizing armature ampere-turns in a d.c. generator.

7. In a particular d.c. machine, if P = 8, Z = 400, N = 300 r.p.m. and = 100 mWb, calculate generated 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 its effects. 9. Develope an expression for the demagnetizing and cross magnetizing armature ampere-turns in a d.c. generator.

Introductory Circuit Analysis (13th Edition)
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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7. In a particular d.c. machine, if P = 8, Z = 400, N = 300 r.p.m. and = 100 mWb, calculate generated 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 its effects. 9. Develope an expression for the demagnetizing and cross magnetizing armature ampere-turns in a d.c. generator.
Transcribed Image Text:7. In a particular d.c. machine, if P = 8, Z = 400, N = 300 r.p.m. and = 100 mWb, calculate generated 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 its effects. 9. Develope an expression for the demagnetizing and cross magnetizing armature ampere-turns in a d.c. generator.
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