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EndsemMay 20232019 patternBE Mech

Renewable Energy Technologies (RET) SPPU Endsem Question Paper May 2023

All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated RET questions
Subject code
402051B
Pattern
2019 pattern
Exam
Endsem
Session
May 2023
Max. marks
70
Time
2½ Hours
Semester
VIII
Paper code
[6004]-625

Printed for: B.E. (Mechanical Engineering)

Instructions to the candidates

  1. Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6 and Q.7 or Q.8.
  2. Neat diagrams must be drawn wherever necessary.
  3. Figures to the right indicate full marks.
  4. Use of electronic pocket calculator is allowed.
  5. Assume Suitable data if necessary.

Questions

  1. Q1

    1. a)

      Explain below solar cells with neat sketch. i) Mono Crystalline ii) Cd-Te and iii) CIGS

      [6]
    2. b)

      Explain the effects of factors affecting electricity generated by a solar cell.

      Also asked:May 2025

      [6]
    3. c)

      If for a given solar power plant, total revenue generated in 25 years is Rs. 19966500 and installation cost of the plant is Rs. 7535730. Calculate Cost Pay Back Time (CPBT) andLife Cycle cost for producing a kWh of electricity by 100 wpsolar PV system over a life time of 25 years.

      [6]

  2. Q2

    1. a)

      Explain following third generation solar cells with neat sketch. i) Polymer based solar cell ii) Quantum Dots solar cell iii) Multi Junction Tandem cells and iv) Hybrid solar cell

      [8]
    2. b)

      Design a standalone PV system for the load specified in the table. Load Number Power Rating (Watt) Hr/day Light (CFL) 3 18 5 Fan 2 50 8 Computer 1 100 2 Find : i) Energy supplied (Wh) by the battery to inverter input considering inverter efficiency = 85 %. ii) Considering Depth of Discharge (DOD) of 50 %, calculate the required charge capacity of battery (24V). iii) Considering two 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 60 wp for the above case considering 6 sunshine hours of 1000 W/m 2 -day. Assume battery efficiency = 80 %, Assume controller circuit efficiency = 100%.

      Also asked:May 2025 ·May 2024

      [10]

  3. Q3

    1. a)

      Explain different components of wind turbines with neat sketch.

      Also asked:May 2025 ·Nov 2024

      [6]
    2. b)

      Explain the following topologies for a wind turbine. i) Rotor axis rotation ii) Rotor Position and iii) Rotor Speed

      [6]
    3. c)

      Write a short on Wind power generation curve and Betz coefficient.

      [6]

  4. Q4

    1. a)

      Explain Horizontal and Vertical Axis turbine with neat sketch.

      Also asked:Nov 2025 ·May 2025 ·May 2024

      [8]
    2. b)

      A propeller type wind turbine has the following data : Speed of free wind at a height of 10 m = 12 m/s Air density = 1.226 kg/m 3  =0.14 Height of the tower = 100 m Diameter of the rotor = 80 m Wind velocity at the turbine reduces by 20 %. Generator efficiency = 85 % Find i) Total power available in the wind ii) Power extracted by the turbine iii) Electrical power generated iv) Axial thrust on the turbine Maximum axial thrust on the turbine

      Also asked:Nov 2025 ·Nov 2024 ·Feb 2023

      [10]

  5. Q5

    1. a)

      Explain off shore and on shore wind farms providing their advantages and disadvantages.

      Also asked:May 2025

      [6]
    2. b)

      Write a short note on : i) ICT based monitoring and control of wind farm ii) Solar PV tracking

      [6]
    3. c)

      Explain Pitch controlled and Stall controlled power control for wind turbines.

      Also asked:May 2025

      [5]

  6. Q6

    1. a)

      List out and explain various components of solar photovoltaic system.

      Also asked:May 2025

      [6]
    2. b)

      Write a short note on : i) Effect of dust on PV and remedies ii) Site selection for wind farm

      [6]
    3. c)

      Write a short note on Yaw control mechanism used in wind turbine with neat sketch.

      [5]

  7. Q7

    1. a)

      List out and explain various type of biomass.

      Also asked:May 2025

      [6]
    2. b)

      Write a short note on Bio-Diesel.

      [6]
    3. c)

      Explain process of pyrolysis with neat sketch.

      [5]

  8. Q8

    1. a)

      Explain following characteristics of biomass : i) Ultimate analysis ii) Proximate analysis and iii) Thermo- gravimetric analysis

      Also asked:May 2025

      [6]
    2. b)

      Write a short note on Bio-Hydrogen.

      [5]
    3. c)

      A biomass gasifier is used to run a compression ignition engine. The engine operates in the dual fuel mode with 80% diesel replacement. The gasifier engine system produces 210Kw of power. Calculate the biomass feeding rate to the gasifier if the efficiency of the engine is 30% and the calorific value of biomass is 16000 kJ/kg. Consider the efficiency of gasifier is 0.7. 

      Also asked:May 2025 ·Nov 2023

      [6]