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(1) D.C. Machines:
Working
principle, construction and methods of excitation.
Armature Winding: Introduction
of simplex
lap and wave windings.
DC generators:
EMF equation – methods of excitation – separately and self-excited
– shunt, series,
compound - armature reaction
–effects of armature reaction -
demagnetizing
& cross
magnetizing ampere-turns
– compensating windings
– inter poles - commutation
– methods to improve
commutation -
voltage build-up –
no load characteristics – load characteristics – losses and
efficiency -
power flow
diagram
–parallel
operation
– applications of DC
generators.
D.C. Motors: Principle
of operation –
back EMF – classification
– torque equation –
losses and efficiency –
power flow diagram – performance
characteristics
of shunt, series and compound motors
–starting
of DC motors – necessity
and types of starters
– design
of starters – speed control
– methods of
speed control –
solid state
speed control
(block diagram)
(2)Transformers:
Single phase Transformer:
Principle, construction
and operation of single phase transformers, phasor diagram, equivalent
circuit, voltage regulation, losses and
efficiency, Testing- Open & short circuit
tests, Polarity
test, Sumpner’s test,
Separation of
hysteresis
and eddy current losses, Autotransformers -
Construction,
Principle,
Applications
and Comparison
with two
winding
transformer, Parallel
operation of single
phase transformer.
Special Transformers: Potential transformer, Current transformer,
Grounding transformer.
Example Based on above Topics
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