ELECTRICAL DEPARTMENT NOTICE BOARD

MID SEM TEST SYLLABUS   

SUBJECT : DESIGN OF DC MACHINES AND TRANSFORMER

SUBJECT CODE : 2160912

SEMESTER : 6^TH

Ch – 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

Ch – 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.

PERFORMANCE PARAMETERS ESTIMATION:

Primary and secondary winding resistance and Leakage reactance

 calculation; Calculation of no load current, losses and temperature

 rise of transformer;

Ch -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.

DESIGN OF FIELD SYSTEMS:

Pole design; Design of field winding of shunt, series and compound

 machines;