ELECTRICAL DEPARTMENT NOTICE BOARD

MID SEM TEST SYLLABUS

SUBJECT : DESIGN OF DC MACHINES AND TRANSFORMER

SUBJECT CODE : 2160912

SEMESTER : 6^TH

(1)GENERAL DESIGN ASPECTS:

Specific  electric  loading  and  Specific  magnetic  loading;  Output

coefficient;  Output  equations for  transformers and rotating machines;

Factors  affecting  size  of  machines;  Criteria  for  selection  of  specific

loadings;

Heating and Cooling of Transformers and rotating machines.

(2)DESIGN OF THREE PHASE TRANSFORMER:

Types

of

transformers;

Position  of

HV

and  LV

windings

and

its

importance; Relation between core and yoke cross section area and its

significance; Different types of transformer windings; Different positions

of taping; Window space factor; Factors affecting window space factor;

Relation between emf per turn and transformer rating; Stacking factor.

MAIN DIMENSIONS:

Design  of  window  dimensions,  yoke  dimensions  and  overall  core

dimensions; Numerical examples.

DESIGN OF WINDINGS:

Design of HVand LV windings (No. of turns and area of cross section);

Selection of type of winding.

(3)DESIGN OF DC MACHINES:

Introduction; Output equation; MMF calculation; Selection of number of

poles; Design of core length and armature diameter; Carter’s fringing

curves  and  its  significance;  Design  of  length  of  air  gap;  Numerical

examples.

ARMATURE DESIGN:

Choice of armature winding; Armature conductor; Number of armature

slots; Slot dimensions; Slot loading; Design of

armature core; Numerical

examples.