Testing of D.C. Machines

UNIT III

Chapter 5

Testing of D.C. Machines

Syllabus

Losses and efficiency in DC machine, condition for maximum efficiency. Testing of DC Machines: Brake test, Swinburne's test, Hopkinson's test, Fields test, Retardation test, Separation of core losses.

Contents

5.1 Introduction...5-2

5.2 Losses in a D.C. Machine........5 2 Dec.-06, May-15, Marks 10

5.3 Efficiencies of a D.C. Machine ............5-4 Dec.-07,09,15,19, May-09, Marks 8

5.4 Testing of D.C. Motors............5-7

5.5 Swinburne's Test or No Load Test...5-8 May-04,05,06,08,16,17, Dec.-04,06,08,16, Marks 16

5.6 Brake Test..................5-13Dec.-07, Marks 3

5.7 Retardation Test or Running Down Test....5-14 Dec.-09,15, Marks8

5.8 Hopkinson's Test ...............5-18 Dec.-05,06,08,09,16,19, May-07,14,16, Marks 8

5.9 Field Test ..................5-23

5.10 Separation of Core Losses...........5 28

5.11 Two Marks Questions with Answers. . . . . . . .5-29