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EX-601 · Power System‑II/Unsolved PYQ Paper

EX-601 Power System - II - Jun 2025 Question Paper

  1. 7 Marks
    aWhat do you understand by restructuring process. Describe various entities involved in restructuring process.
  2. 7 Marks
    bExplain to calculate available transfer capacities using AC power flow analysis.
  3. 7 Marks
    aCompare various load flow solution methods.
  4. 7 Marks
    bExplain Gauss-Seidel method of power flow analysis.
  5. 14 Marks
    Determine $Y_{bus}$ for the 4-bus system if the line series impedances are as follows: Neglect shunt capacitance of the line.
  6. 7 Marks
    aExplain the methods used for protection and absorption of reactive power in power systems.
  7. 7 Marks
    bDiscuss various voltage control methods used in modern power systems.
  8. 7 Marks
    aDerive the swing equation and explain its physical significance in the context of rotor angle stability.
  9. 7 Marks
    bA turbo alternator with 4-pole, 50 Hz, 80 MW, 0.8 lag and moment of inertia 40,000 $kgm^2$ is interconnected via a short transmission line to another alternator with 2-pole, 50 Hz, 100 MW, p.f. 0.8 lag and moment of inertia 10,000 $kgm^2$. Determine the inertia constant of the single equivalent machine on a base of 100 MVA.
  10. 7 Marks
    aExplain why it is necessary for keeping strict limits on the system frequency variations.
  11. 7 Marks
    bA 100 MVA 50 Hz turbo alternator operates at no load at 3000 rpm. A load of 25 MW is suddenly applied to the machine and the steam valves to the turbine commence to open after 0.6 secs due to the time lag in the governor system. Assuming inertia constant H of 4.5 kw-sec per KVA of generator capacity, calculate the frequency to which the generated voltage drops before the steam flow commences to increase to meet the new load.
  12. 7 Marks
    aDifferentiate between steady state and transient stability of a power system. Discuss the factors that affect (i) steady state stability and (ii) transient state stability of the system.
  13. 7 Marks
    bA 50 Hz generator is delivering 50% of the power that is capable of delivering through a transmission line to a infinite bus. A fault occurs that increases the reactance between the generator and the infinite bus to 500% of the value before the fault. When the fault is isolated, the maximum power that can be delivered is 75% of the original maximum value. The determine the critical clearing angle for the condition described.
  14. 14 Marks
    Write short notes (any two)
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