The GATE Grind

GATE Power Systems: Basic concepts of electrical power generation, AC and DC transmission concepts, Models and performance of transmission lines and cables – Previous Year Questions

13 GATE previous year questions on Basic concepts of electrical power generation, AC and DC transmission concepts, Models and performance of transmission lines and cables (Power Systems, Electrical Engineering) with answers and explanations, from every paper.

  1. GATE 2015 EE Q26 (1 mark, Multiple choice) – Consider a HVDC link which uses thyristor based line-commutated converters as shown in the figure. For a power flow of 750 MW from System 1 to System…
  2. GATE 2015 EE Q27 (1 mark, Multiple choice) – Base load power plants are P: wind farms. Q: run-of-river plants. R: nuclear power plants. S: diesel power plants.
  3. GATE 2016 EE Q61 (2 marks, Numerical answer) – A single-phase transmission line has two conductors each of 10 mm radius. These are fixed at a center-to-center distance of 1 m in a horizontal plane.…
  4. GATE 2018 EE Q16 (1 mark, Multiple choice) – Consider a lossy transmission line with V 1 and V 2 as the sending and receiving end voltages, respectively. Z and X are the series impedance and…
  5. GATE 2019 EE Q53 (2 marks, Numerical answer) – The voltage across and the current through a load are expressed as follows v(t)=-170(377t-6) V, i(t)=8(377t+6) A. The average power in watts (round…
  6. GATE 2021 EE Q25 (1 mark, Numerical answer) – Two single-core power cables have total conductor resistances of 0.7\ and 0.5\ , respectively, and their insulation resistances (between core and…
  7. GATE 2022 EE Q14 (1 mark, Multiple choice) – The geometric mean radius of a conductor, having four equal strands with each strand of radius 'r', as shown in the figure below, is
  8. GATE 2022 EE Q30 (1 mark, Numerical answer) – If only 5% of the supplied power to a cable reaches the output terminal, the power loss in the cable, in decibels, is . (round off to nearest integer)
  9. GATE 2023 EE Q33 (1 mark, Numerical answer) – A 50 Hz, 275 kV line of length 400 km has the following parameters: Resistance, R=0.035\ /km; Inductance, L=1 mH/km; Capacitance, C=0.01\ F/km; The…
  10. GATE 2023 EE Q64 (2 marks, Numerical answer) – A balanced delta connected load consisting of the series connection of one resistor (R=15\ ) and a capacitor (C=212.21\ F) in each phase is connected…
  11. GATE 2024 EE Q41 (2 marks, Multiple choice) – For the three-bus lossless power network shown in the figure, the voltage magnitudes at all the buses are equal to 1 per unit (pu), and the…
  12. GATE 2025 EE Q24 (1 mark, Multiple choice) – During a power failure, a domestic household uninterruptible power supply (UPS) supplies AC power to a limited number of lights and fans in various…
  13. GATE 2026 EE Q54 (2 marks, Multiple select) – For the balanced 3-phase transmission line shown, consider the following cases: **Case-1:** V 1 =1.1 p.u., V 2 =0.9 p.u., Z=0.750 p.u. and 12= 1- 2=0…