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

EX-601 Power System - II - May 2024 Question Paper

  1. 7 Marks
    aTwo power plants A and B are interconnected by a short line. Capacity of A is 200 MW and that of B is 100 MW. Their speed regulations (from no load to full load) are 1.5% and 3% respectively. The load on bus of each station is 100 MW. Find the generation at each plant and transfer of power through line.
  2. 7 Marks
    bIn interconnected system how the real and reactive power is controlled explain.
  3. 7 Marks
    aCompare the performance of Gauss-Seidel and Newton-Raphson methods for load flow solution. Explain the method of formation of $Y_{bus}$.
  4. 7 Marks
    bDefine Economic operation of power system.
  5. 7 Marks
    aWhat is the significance of load flow analysis in a power system? Give the classification of various types of buses in a power system for load flow studies. Justify the classification.
  6. 7 Marks
    bUsing Gauss-Seidel method give a flow chart for a load flow study on a power system having only P-Q buses. What modification is made in the flow chart to account for PV buses? Discuss.
  7. 7 Marks
    aA 100 MVA synchronous generator operates on full load at a frequency of 50 Hz. The load is suddenly reduced to 50 MW Due to time lag in governor system, the steam valve begins to close after 0.4s. Determine the change in frequency that occurs in this time.
  8. 7 Marks
    bDefine modeling of turbine speed governing system.
  9. 7 Marks
    aWhat are the types of excitation systems? Draw the functional block diagrams of them and briefly describe the various elements of the block diagrams.
  10. 7 Marks
    bExplain the DC excitation system with amplidyne voltage regulator.
  11. 7 Marks
    aBy the phasor diagram and equation, show that the voltage drops is almost due to the reactive power.
  12. 7 Marks
    bExplain with block diagram the brush less excitation system of synchronous generators.
  13. 7 Marks
    a50 Hz 4 pole turbo generator rated at 20 MVA 13.2 kV has an inertia constant of H=9 KW-sec/KVA. Find the kinetic energy stored in the rotor at synchronous speed.
  14. 7 Marks
    bDerive the relation for linearized swing equation for small incremental changes and findout the steady state stability limits. What are the causes of instability.
  15. 14 Marks
    Write a short notes on (any two)
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