WBBSE Madhyamik Electronics (Vocational) case studies
WBBSE Madhyamik Electronics (Vocational) · Put your knowledge to work in context.
Electronics as a vocational subject at the Madhyamik level is a school-leaving qualification with a practical, trade-oriented core: it is designed for Class 10 candidates in West Bengal who want a recognised secondary certificate alongside marketable bench skills. It suits students who are comfortable with basic arithmetic and physics, enjoy building and repairing things, and may move into an ITI, polytechnic diploma, or a service-shop apprenticeship rather than a purely academic stream. The WBBSE Madhyamik Electronics (Vocational) case studies are 5 cases and about 2,921 words.
1Voltage Drop on a 12 V LED Strip Run
A shop installs 5 m of 12 V LED strip rated 4.8 W/m in a customer's false ceiling. The 12 V, 5 A adapter sits at one end, and the strip is fed only at its far end through 14 m of 0.75 mm² copper cable (resistivity about 0.0175 Ω·mm²/m).
606 words, about 3 min2Zener Shunt Regulator That Collapses Under Load
A trainee builds a 5.1 V Zener shunt regulator for a sensor board. The unregulated input is 12 V nominal but varies from 10.8 V to 13.2 V.
609 words, about 3 min3Hum and Ripple After a Reservoir Capacitor Replacement
A technician repairs a small audio preamp that is fed from a 12 V AC, 50 Hz transformer through a bridge rectifier and a 2200 µF reservoir capacitor. The preamp draws 0.4 A.
505 words, about 3 min4Two-out-of-Three Interlock That Energizes With One Input
A trainee wires a two-out-of-three interlock for a small press using 74LS08 AND gates and a 74LS32 OR gate, implementing Y = AB + BC + AC. Inputs A, B and C come from three normally open limit switches pulled up by 4.7 kΩ resistors; a closed switch gives logic 0 and an open switch gives logic 1.
616 words, about 3 min5Clearing a Store Room With Battery, CRT and Chemical Waste
A vocational trainee is asked to clear a locked store room before an inspection. The room contains a swollen lithium-ion power bank with a cracked case, a 21-inch CRT television with a broken back cover, a half-full tin of lead-based solder, a squeeze bottle of ferric chloride etchant, and a box of assorted PCB scraps.
585 words, about 3 min