JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III FUNDAMENTALS OF MECHANICAL ENGINEERING Previous Question Paper (May/June - 2019 - R16)
Part A is compulsory (25 Marks). Answer all questions. Part B consists of 5 Units. Answer any one full question from each unit (10 marks each).
Part A
Write the statement of zeroth law of thermodynamics.
Answer
The zeroth law of thermodynamics states that if two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. This principle serves as the basis for the definition of temperature and the construction of thermometers.
Write a short note on Global warming.
Answer
Global warming refers to the long-term increase in the Earth's average surface temperature due to the enhanced greenhouse effect. This phenomenon is primarily driven by human activities that release greenhouse gases into the atmosphere.
Key aspects include:
- Greenhouse Gases: Emissions of carbon dioxide (CO2), methane (CH4), and nitrous oxide from burning fossil fuels, deforestation, and industrial processes trap heat in the atmosphere.
- Impacts: The rise in temperature leads to the melting of polar ice caps, rising sea levels, and increased frequency of extreme weather events such as droughts, floods, and heatwaves.
- Consequences: These changes disrupt ecosystems, threaten biodiversity, and pose significant risks to human health, agriculture, and global economic stability.
Define Charle's law.
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What are fire tube boilers?
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Define Indicated power.
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Draw p-v and T-s plots of Otto cycle. Indicate all salient features.
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What is the working principle of rotary pump?
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Write a note on window air conditioner.
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What do you mean by disc type clutch?
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What are the applications of Abrasive materials?
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Part B
What is a prime mover? Explain various types in detail.
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What do you mean by a fossil fuel? List out different types and their application.
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Write a note on bio fuels.
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Write a note on solar power.
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Why cannot a throttling calorimeter measure the quality if the steam is very wet?
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A spherical shell of diameter 50 cm contains steam at a pressure of 40 bar and 0.85 dryness fraction. Calculate the mass of water and steam.
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Discuss working of Chocran boiler with the help of a neat sketch.
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An engine operating on a Carnot cycle works with in temperature limits of 600 K and 300 K. If the engine receives 2000 kJ of heat, evaluate the work done and thermal efficiency of the engine.
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Draw the p-v and T-s plots of Otto cycle. Derive the expression for thermal efficiency of Otto cycle.
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Write detailed classification of IC engines based on various aspects.
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Write the differences between petrol engines and diesel engines.
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Differentiate between positive displacement compressors and dynamic compressors.
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What is meant by multistage compression? Explain its significance.
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Explain working of vapour absorption refrigeration system with the help of a neat sketches of layout and property plots. Derive expression for COP.
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Discuss the construction details of flange coupling.
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Explain the working of gear drive.
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Write a note on various metals that come under engineering materials. Discuss their applications.
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