JNTU
JNTU B.Tech IV WIND, SOLAR AND HYBRID ENERGY SYSTEMS Previous Question Paper (July - 2023 - R16)
Part A is compulsory (25 marks). In Part B, answer any one question from each unit (10 marks each).
Part A
What is Betz limit ratio?
Answer
The Betz limit is the theoretical maximum efficiency of a wind turbine, which states that no wind turbine can capture more than 16/27 (approximately 59.3%) of the kinetic energy in the wind.
What are the types of stall control?
Answer
The two primary types of stall control are:
- Passive Stall Control: The blades are designed with a fixed pitch angle such that they naturally stall as wind speeds increase beyond a certain point.
- Active Stall Control: The blade pitch angle is adjusted by a control system to induce stall at high wind speeds to limit power output.
Define tip speed ratio.
Answer
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What are the deciding factors to be considered for the selection of generator in WECS?
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Draw the block diagram of solar photovoltaic system.
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What is beam and diffused radiation?
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Give the types of solar pond.
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What is the function of central receiver used in solar thermal power generation?
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What are the power quality issues in hybrid systems?
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What are the voltage and frequency operating limits for grid operation of different energy systems?
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Part B
Write short notes on Pitch Control.
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Discuss the need of wind power in the present Scenario.
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Derive and express the equation for power obtained from the wind from the first principles.
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Draw the block diagram for the implementation of constant speed constant frequency based WECS and explain the function of each block in it.
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Compare fixed speed WECS and variable speed WECS.
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Explain the operation of DFIG used in wind energy conversion system.
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Define and explain the following with neat diagrams: i) Solar azimuth angle ii) declination angle.
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Draw and Explain the V-I characteristics of a PV cell?
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What are the different MPPT algorithms? Explain in detail.
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Parabolic dish
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Parabolic trough.
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What are the technologies used for the solar thermal power generation? Explain any two in detail.
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Explain in detail the Hybrid operations of solar PV and wind systems.
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What is meant by standalone WECS system? Explain about the issues of Grid Connection.
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