Karnataka SSLC Elements of Electrical Engineering IV - JTS (KSEAB) case studies
Karnataka SSLC Elements of Electrical Engineering IV - JTS (KSEAB) · Put your knowledge to work in context.
Elements of Electrical Engineering IV is the JTS (Job Training Scheme) electrical paper in the Karnataka SSLC vocational stream, examined by KSEAB. It is aimed at secondary-level vocational candidates who are building technician-entry skills: school students taking the JTS trade paper, private candidates, and learners who want a recognised school-leaving credential with a practical electrical core rather than a purely academic science stream. The Karnataka SSLC Elements of Electrical Engineering IV - JTS (KSEAB) case studies are 5 cases and about 3,721 words.
1Rewinding a Scrap-Yard Lifting Magnet
A JTS trainee at a scrap dealer's yard is asked to rewind the coil of a circular lifting electromagnet used on a 3-tonne crane. The iron core is cast iron with a mean magnetic path length of 0.40 m and a uniform cross-section of 20 cm².
738 words, about 4 min2Adding Loads to a 25 kVA Workshop Transformer
The electrical board of a small printing unit is fed by a dedicated 415 V, 50 Hz, 25 kVA three-phase distribution transformer whose iron loss is 400 W and full-load copper loss is 700 W. The connected load is a 7.5 kW three-phase motor (efficiency 88%, power factor 0.82 at full load) plus single-phase lighting and socket circuits taken phase-to-neutral at 240 V: 3 kW on the red phase, 2 kW on the yellow phase and 1 kW on the blue phase, all effectively resistive.
720 words, about 4 min3Star-Delta Starting Judgement for a Compressor Motor
A garment factory's compressed-air supply is driven by a 415 V, 50 Hz, 11 kW, 4-pole squirrel-cage motor running at 1440 rpm at full load, with efficiency 88% and power factor 0.84. The nameplate gives Ist/In = 6.5, Tst/Tfl = 2.2 and Tmax/Tfl = 2.4.
718 words, about 4 min4RCCB Nuisance Tripping in a Sheet-Metal Workshop
A sheet-metal workshop is fed from a 415 V three-phase four-wire supply through a 63 A main switch and a single 4-pole, 30 mA-sensitivity RCCB protecting the whole board. The sub-circuits are: a 3.7 kW, 415 V three-phase motor (nameplate full-load current 7.4 A) protected by a 20 A type C MCB and wired in 2.5 mm² copper; two 2 kW, 230 V heater banks, each on a 16 A MCB; and 500 W of lighting.
812 words, about 4 min5Checking a Flour Mill's Energy Bill, CT Ratio and Power-Factor Penalty
A flour mill is a low-tension three-phase consumer with a sanctioned load of 20 kW. Its meter is connected through three 100/5 A current transformers, and the CT multiplier has been entered as 20 in the billing system.
733 words, about 4 min