Odisha CHSE +2 Vocational EDA (Electrical Domestic Appliances) case studies
Odisha CHSE +2 Vocational EDA (Electrical Domestic Appliances) · Put your knowledge to work in context.
The Odisha CHSE +2 Vocational programme in Electrical Domestic Appliances (EDA) is a higher-secondary vocational stream offered under the Council of Higher Secondary Education, Odisha. It suits students who want a practical, trade-oriented qualification alongside or instead of a purely academic +2 course, and it also serves hobbyists, ITI holders and small repair-shop workers who want recognised grounding in household electrical work. The Odisha CHSE +2 Vocational EDA (Electrical Domestic Appliances) case studies are 5 cases and about 3,507 words.
1Geyser Circuit Losing 19 V: Cable or Joint?
A single-storey house in Bhubaneswar is supplied at 230 V, single phase. A 2 kW, 230 V storage geyser is fed from the distribution board through a 32 m run of 1.0 mm² copper twin-core cable, part of which is buried in a wall conduit shared with two lighting circuits.
671 words, about 3 min2Random RCD Tripping and the Demand for a 100 mA Unit
A 25-year-old house has a main distribution board containing a 63 A isolator, a 63 A / 30 mA RCD used as the main switch, and four MCBs: 6 A lighting, 16 A socket outlets, 16 A geyser and 20 A for a 1.5 TR window AC. For several weeks the RCD has tripped at random, most often at night during rain and sometimes a few seconds after the AC compressor starts.
748 words, about 4 min3Mixer Grinder: 'Just Change the Brushes'
A 750 W, 230 V, three-speed mixer grinder, four years old, comes to a service centre. The customer reports sparks visible through the ventilation slots near the brushes, a sharp fall in speed when wet masala is ground, loud humming under load, and the 6 A MCB tripping after 10–15 s of loaded running.
689 words, about 3 min4Refrigerator That Hums, Clicks and Never Cools
A 190 L single-door domestic refrigerator with a hermetic compressor and R600a refrigerant is five years old. The owner reports that it stopped cooling two days ago.
695 words, about 3 min5Shop Wiring Quotation and a Warranty Dispute
A vocational graduate runs a small electrical repair and wiring shop. A customer wants a quotation for wiring a 600 sq ft two-room rented shop: 6 LED tube lights, 4 ceiling fans, 8 six-amp sockets, 2 sixteen-amp sockets for an AC point, a distribution board with a 30 mA RCD and MCBs, conduit, boxes and earthing.
704 words, about 4 min