GATE GG case studies
GATE GG · Put your knowledge to work in context.
GATE 2026 (Graduate Aptitude Test in Engineering) is a national-level examination that assesses candidates' comprehensive understanding of undergraduate-level subjects in Engineering/Technology/Science/Commerce/Arts/Architecture/Humanities. It is conducted by IISc and all IITs on behalf of the National Coordination Board, Department of Higher Education, Ministry of Education, Government of India, with IIT Guwahati as the Organizing Institute for 2026. The GATE GG case studies are 5 cases and about 3,450 words.
1String sizing and yield claim for a 9 kWp rooftop PV plant
A 9 kWp rooftop array is proposed for a garment unit in Coimbatore: 20 modules of 450 Wp each (Voc 49.5 V, Vmp 41.2 V, Impp 10.93 A, beta Voc = −0.27 %/°C, beta Vmp = −0.40 %/°C, gamma Pmp = −0.35 %/°C, NOCT 45 °C), wired as two strings of ten into a string inverter rated 8 kW AC with an MPPT window of 200–800 V and a 1000 V DC maximum. The site record low is −5 °C; on a 45 °C ambient day the measured cell temperature is 68 °C.
722 words, about 4 min2Energy yield and 20 MW grid cap for a 25.2 MW wind farm
A 25.2 MW onshore wind farm is planned with twelve 2.1 MW turbines at 110 m hub height. The consultant's table of hub-height wind-speed bins with average turbine output is: 0–4 m/s, 1,200 h, 0 kW; 4–6 m/s, 2,100 h, 350 kW; 6–8 m/s, 2,400 h, 950 kW; 8–10 m/s, 1,600 h, 1,650 kW; 10–12 m/s, 900 h, 2,100 kW; 12–25 m/s, 560 h, 2,100 kW.
729 words, about 4 min3Moisture upset in a 500 kg/h rice-husk gasifier CHP
A 400 kW-class downdraft gasifier–engine CHP unit is being commissioned at a rice mill. Design feed is 500 kg/h of rice husk as received at 12% moisture with LHV 13.5 MJ/kg.
666 words, about 3 min4Battery arbitrage and demand-charge stacking for an industrial consumer
An industrial consumer with 2.0 MVA contract demand is evaluating a 2 MW / 8 MWh lithium-iron-phosphate battery at its 11 kV bus. The plant load is flat at about 1.6 MW from 06:00 to 22:00 and 1.1 MW overnight.
606 words, about 3 min5Heat pump versus PNG boiler for a dairy hot-water load
A dairy plans to replace its PNG-fired hot-water boiler with an electric heat pump. The site needs 1,800 MWh of hot water a year at 70 °C.
727 words, about 4 min