SSC JE Electrical case studies
SSC JE Electrical · Put your knowledge to work in context.
The Junior Engineer (Civil, Mechanical & Electrical) Examination is conducted by the Staff Selection Commission (SSC), India's central recruitment body. As the commission's own site describes it, "This competitive exam is held to recruit junior engineers in various government departments and organizations." Candidates choose one engineering branch - Civil, Mechanical or Electrical - and compete within that branch for junior engineer posts across participating departments and organisations. The SSC JE Electrical case studies are 5 cases and about 2,760 words.
1Cube results below the M25 acceptance band on a framed structure
A residential frame uses M25 concrete supplied by a ready-mix plant. The site engineer has 28-day cube results for the third lift: 21.8, 23.2 and 24.6 N/mm², each the average of three 150 mm cubes.
531 words, about 3 min2Pump upgrade at a cooling-water transfer station
A cooling-water transfer pump runs at 1450 rpm and is rated 20 L/s at 30 m head, with a published efficiency of 68%. It is driven by an 11 kW, 415 V, three-phase squirrel-cage motor.
617 words, about 3 min3Loading a 630 kVA transformer beyond its derated capacity
A 630 kVA, 11/0.433 kV, ONAN distribution transformer serves a small industrial feeder. The monthly maximum demand is 480 kW at a power factor of 0.82, and the ambient in the transformer bay reaches 46°C in summer.
513 words, about 3 min4Cable and starter selection for a 30 kW motor at the end of a long feeder
A 30 kW, 415 V, three-phase, four-pole induction motor drives a conveyor. The motor nameplate gives 56 A at 0.86 power factor and 91% efficiency.
576 words, about 3 min5Power-factor correction on a VFD-heavy 415 V bus
A fabrication shop has a maximum demand of 800 kW at 0.72 lagging power factor on a 415 V, 50 Hz bus. The utility tariff penalises power factor below 0.90 and the plant wants to target 0.95.
523 words, about 3 min