Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV NANOTECHNOLOGY FOR ENERGY SYSTEMS Previous Question Paper (May - 2019 - R15)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
Write positive and negative sign conventions for cathode and anode electrodes in battery devices.
Answer
In a discharging battery, the anode is assigned a negative (-) sign as it is the site of oxidation, while the cathode is assigned a positive (+) sign as it is the site of reduction.
How Li-ion battery is different from other batteries?
Answer
Li-ion batteries differ from traditional batteries primarily due to their high energy density, low self-discharge rate, and absence of the memory effect. Unlike aqueous-based batteries (like Lead-acid or Ni-Cd), they utilize non-aqueous electrolytes and operate on an intercalation mechanism, allowing for a lightweight design and longer cycle life.
Write few renewable energy sources
Answer
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What is the bandgap of Silicon (Si)? Why it is preferred in solar cells?
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What do you mean by CIGS solar cells?
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Write chemical equations of potassium iodide couple regeneration for ionic transport in Dye Sensitized Solar Cells (DSSC).
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What do you mean by gravimetric storage capacity?
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Define metal-organic framework (MOF)? Write any two MOF materials.
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What is Proton Exchange Membrane (PEM) cell?
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What is the role of methanol in DMFC?
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Part B
What are the basic components of a battery? Discuss in detail the working principle of Lithium (Li) ion battery with a neat schematic diagram.
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Write different anodic and cathodic materials that are frequently used in Li ion batteries.
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What is the main criterion of selection of these materials?
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Explain in detail the energy needs, demands and challenges.
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Discuss briefly the methodologies adopted to overcome the existing energy crisis.
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Discuss briefly the nanomaterials and nanostructures that are used in energy harvesting process.
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Distinguish CIGS and DSSC briefly.
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What do you mean by quantum dot? Explain the concept of quantum dot solar cells.
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With a neat schematic diagram, explain the working principle of dye sensitized solar cells (DSSC).
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Write short notes on hydriding and dehydriding kinetics.
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What do you mean by thermal management during hydriding reaction? Explain briefly.
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What type of materials used to store hydrogen? Discuss briefly with few examples.
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What do you mean by fuel cell? Write basic components and explain working principle of any fuel cell of your choice with a neat schematic diagram.
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Can primary alcohols play any role in DMFCs? Explain briefly why methanol is preferred among existing primary alcohols.
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Discuss the role of catalyst in fuel cells? Explain how to improve the performance of the catalyst subjected to low cost.
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