Question Bank for Renewable Energy

  1. Write a comparison between conventional and non-conventional energy sources. Mention at least five differences between them.
  2. Define extraterrestrial radiation and air mass. Describe three components of solar radiation with a suitable diagram.
  3. Explain the wind electric conversion system including its block diagram. Also, describe at least two wind energy storage systems.
  4. Derive the input power (i.e., wind power) expression for a wind turbine. A wind turbine has a rotor diameter of 120m and operates at a wind speed of 10 m/s. The wind turbine has a rated power output of 3.6 MW at a wind speed of 12 m/s. Calculate the power output of the wind turbine at the current wind speed.
  5. Explain the hour angle with a suitable diagram. Calculate the hour angle as well as daylight hours (at sunrise and sunset) on 15th June and 15th December for a surface inclined at an angle of 100 and facing towards south. The solar radiation trapping surface is located in NIT Patna (i.e., 250 37′ N, 850 10′ E).
  6. Discuss four major functions of a thermal-electric conversion system with a proper schematic diagram.
  7. What is a solar energy collector? Classify and describe different concentrating and non-concentrating solar energy collectors.
  8. Define solar altitude angle with a suitable diagram. Find the solar altitude angle at 2 hours after the local solar angle on 1st June for a place located at 26.750 N latitude. Also, determine the day length, sunrise hours and sunset hours.
  9. Describe the working principle of MHD generation. Discuss various components used in the MHD generator including their material selection criteria. Write the advantages and disadvantages of MHD generation. Derive the maximum power expression from the equivalent circuit of MHD generator.
  10. A wind turbine has a rotor diameter of 120 m and a rated power output of 3 MW. The wind speed at the site is measured 14 m/s. Assume, the power coefficient is 0.45. Calculate the following:
    • a) The swept area of the wind turbine,
    • b) The annual energy production (AEP) of the wind turbine assuming a capacity factor of 0.32,
    • c) The percentage of the rated power that the wind turbine achieves based on the measured wind speed.
  11. Write five power sale modes of renewable energy (RE).
  12. What is aggressive RE integration ? Describe four rules of energy mix.
  13. Write short notes on:
    • (a) Solar pond
    • (b) Thermoelectric effects
    • (c) Bio-gas generation
    • (d) Fuel cell
    • (e) Three direct energy conversion processes
  14. A wind turbine with a rotor diameter of 80 meters operates at an efficiency of 40%. The wind speed at the site is measured to be 10 m/s. What is the maximum electrical power output that can be generated by the wind turbine ?
  15. Determine the local solar time (LST) at a location of 230 15′ N, 770 30′ E and 12.30 IST if declination angle is 210 25′ and equation of time correction is -1. (Standard meridian of India is 82.50 E)
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