Specifications

HIGHER SECONDARY – VOCATIONAL COURSE
ELECTRICAL MACHINES AND APPLIANCES
SECOND YEAR – THEORY SYLLABUS
1. Winding Insulating Materials
Introduction – Electrical properties – Classification – Characteristics – Application areas insulation
materials – plastics – insulating varnishes - Types of Insulating varnishes
2. Winding Wire
Introduction – Properties – Characteristics – Choice of Conductor material – Enamelled wire –
Grades – Properties – Types & shapes of winding wires – Gauge plate
3. Details of winding
Coil details – shapes of slot – slot insulation – coil formation – Stator (stationary) winding –
Rotor (rotating) winding – DC Armature winding - Lap winding – wave winding – whole coil
winding – half coil winding – concentrated winding – distributed winding - single layer winding –
double layer winding – single phase winding – three phase winding – concentric winding –
chain winding.
4. Development of winding – AC machines
Single phase windings – Lap winding – wave winding – concentric winding – Three phase
winding – single layer winding – double layer winding.
5. Development of winding – DC machines
General procedure – Double Layer simplex Lap winding – Double layer duplex Lap winding –
Double Layer simplex wave winding.
6. Rewinding and Testing of Electric Motors
Methods of Rewinding – Testing the new winding – Testing of Armature – Insulation resistance
test - Growler test - Drop test.
7. Instruments and Testing
Introduction – Voltage tester screwdriver – Continuing Test – Insulation test – Measurement of
Power for DC & AC Circuits.
8. Electrical Cooking Appliances
Introduction – Types – Construction – Electric Toaster – Types – Automatic and Non-Automatic.
9. Electric Iron Box
Types – Non-Automatic – Automatic – Construction and Working – Comparision – Trouble
Shooting – Steam Iron Box.
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