Renewable Energy Technologies (RET) SPPU Endsem Question Paper May 2024

Questions

1. Q1

   1. a)

      Describe the principle of solar photovoltaic energy conversion. How does the variation of insolation and temperature affect the I-V characteristics of a solar cell?

      [6]
   2. b)

      Describe the classification of solar cells based on the type of active material used.

      [6]
   3. c)

      Explain various factors contributing to losses and efficiency reduction in a solar cell.

      [6]
   OR

2. Q2

   1. a)

      State the principle of solar photovoltaic (PV) energy conversion and the applications of solar PV systems.

      [8]
   2. b)

      Design a standalone PV system for the load specified in the table. Load Number Power Rating (Watt) Usage Hr/day LED lamp 1 40 12 Refrigerator 1 80 8 Computer 1 60 6 2 Find: i) Energy supplied (Wh) by the battery to inverter input considering inverter efficiency = 80 %. ii) Considering Depth of Discharge (DOD) of 50 %, calculate the required charge capacity of battery (24V). iii) Considering three days of autonomy, calculate battery charge capacity. iv) Calculate no. of batteries needed for 24 V system voltage if the available battery configuration is 12 V and 100 Ah. v) Calculate the number of panels of 40 W P for the above case considering 8 sunshine hours of 1000 W/m 2 -day. Assume battery efficiency = 80 %, Assume controller circuit efficiency = 100%.

      Also asked:May 2025 ·May 2023

      [10]

3. Q3

   1. a)

      Explain the principle of aerodynamic lift and also explain the various forces acting on aerofoil shape blade of wind turbine.

      [6]
   2. b)

      Compare vertical axis wind turbine with horizontal axis turbine.

      Also asked:Nov 2025 ·May 2025 ·May 2023

      [6]
   3. c)

      List and briefly explain the various parts of horizontal axis wind turbine.

      [6]
   OR

4. Q4

   1. a)

      Explain how the wind energy systems (WECS) are classified? Discuss in brief?

      [8]
   2. b)

      A propeller type wind turbine having blade diameter of 60 m is in operation at a speed of 175 rpm with a wind velocity of 25m/s. Calculate the total power density in the wind, maximum obtainable power density, total power produced with an efficiency of 30%, torque and axial thrust. Assume air density as ρ = 1.226 kg/m 3 .

      [10]

5. Q5

   1. a)

      Describe the working principle of grid connected SPV system with battery storage.

      [6]
   2. b)

      How do you calculate annual energy yield of wind power plant?

      [6]
   3. c)

      Comment on the environmental impact of wind energy. 3

      [5]
   OR

6. Q6

   1. a)

      Explain i) speed control strategies for wind turbines; and ii) power-speed characteristics of wind turbine for different wind speed.

      [6]
   2. b)

      What are the determinant factors in site selection for photovoltaic projects?

      [6]
   3. c)

      What is the effect of solidity on the performance of wind turbine?

      [5]

7. Q7

   1. a)

      Compare the relative performance of a floating drum and fixed one type biogas plants?

      [6]
   2. b)

      Give the advantages and disadvantages of biomass energy.

      [6]
   3. c)

      What are the different biomass energy resources and what is the energy yield from each of them.

      [5]
   OR

8. Q8

   1. a)

      What is gasification? Explain the processes i) Drying ii) Pyrolysis iii) Oxidation

      [6]
   2. b)

      What are thermo chemical and biochemical conversions?

      [5]
   3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [6]