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EndsemNov 20242019 patternBE Mech

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

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
402051 B
Pattern
2019 pattern
Exam
Endsem
Session
Nov 2024
Max. marks
70
Time
2½ Hours
Semester
VIII
Paper code
[6354]-634

Printed for: B.E.

Instructions to the candidates

  1. Solve Q1 or Q2, Q3 or Q4, Q5 or Q6, Q7 or Q8.
  2. Assume suitable data if necessary.
  3. Neat diagram must he drawn wherever necessary
  4. Figures to the riqht indicate full marks.
  5. Use of electronic pocket calculator is allowed.

Questions

  1. Q1

    1. a)

      What is second generation solar cell? Explain with neat sketch Amorphous Silicon cell.

      [8]
    2. b)

      Explain with neat sketch cell, Module and array. List and explain types of Modules

      [10]

  2. Q2

    1. a)

      Explain i) Life cycle costing ii) Payback time

      [8]
    2. b)

      A residential house has a power requirement of 400 W for 4 hours every night. It is proposed to meet the requirement by using a PV array, a battery storage system and an inverter. The whole system is over designed so that it can meet one extra night’s requirement even if there has been no sunshine during the day. Calculate number of PV modules and batteries required. Given: i) Solar radiation is available for an average of six hours daily and average hourly global radiation flux incident on the array is 650 W/m 2 . ii) Battery rating = 12 V; 120 Ah. Depth of discharge = 0.7 Charging and discharging efficiency 0.9 iii) Inverter efficiency at full load =0.85. 2

      Also asked:Nov 2025

      [10]

  3. Q3

    1. a)

      Describe any two configurations of rotors of Horizontal axis wind turbine with labeled diagram.

      [8]
    2. b)

      A propeller type wind turbine has following data : Speed of free wind at a height of 10 m = 12 m/s Air density = 1 .226 kg/m 3 Induction or perturbation factor = 0. 14 Height of tower = 100 m Diameter of rotor = 80 m Wind velocity at the turbine reduces by 20% Generator efficiency = 85% Determine : i) Total power available in wind ii) Power extracted by the turbine iii) Electrical power generated iv) Axial thrust on the turbine v) Maximum axial thrust on the turbine

      Also asked:Nov 2025 ·May 2023 ·Feb 2023

      [9]

  4. Q4

    1. a)

      Describe the different types of variable speed drive systems of wind turbine

      [9]
    2. b)

      Elaborate the Materials used for wind turbine components.

      Also asked:May 2025 ·May 2023

      [8]

  5. Q5

    1. a)

      Write short notes on i) Stall control ii) Pitch control iii) Yaw control

      [12]
    2. b)

      Calculate the annual energy output production from a horizontal axis wind turbine with swept area 200 m 2 and operating in a wind regime with an average wind speed of 6 m/s, the density of wind is 1 .225kg/m 3 and the wind power coefficient is 0.40.

      Also asked:Nov 2025

      [6]

  6. Q6

    1. a)

      Write short notes on i) Maintenance procedure of solar photovoltaic plants ii) Effect of dust on PV and remedies

      [10]
    2. b)

      Write note on installation of electrical and electronic components of PV system. 3

      [8]

  7. Q7

    1. a)

      Explain Ethanol production with transesterification process.

      [7]
    2. b)

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

      [10]

  8. Q8

    1. a)

      What do you understand by the term gasification? Explain with schematic diagram the downdraft gasifier.

      [9]
    2. b)

      Write the factors considered for site selection of biogas plants. Why Biogas plants are not much successful in India. ♦♦♦

      [8]