Download VTU B-Tech/B.E 2019 June-July 1st And 2nd Semester 2015 June-July 14EME14 Elements of Mechanical Engineering Question Paper

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First/Second Semester B.E. Degree Examination, June/July 2015

Elements of Mechanical Engineering

Time: 3 hrs.

Note: Answer FIVE full questions, selecting ONE full question from each part.

Max. Marks: 100

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PART — A

1. 1. What are the advantages and disadvantages of renewable and non-renewable energy sources? (05 Marks)
   2. What is calorific value? Compare biofuels with petroleum fuels in terms of calorific value. (05 Marks)
   3. Explain with a neat sketch, the working of Babcock and Wilcox boiler. (10 Marks)

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2. 1. Explain briefly the principle of conversion of solar energy directly into electrical energy in a solar cell. (10 Marks)
   2. Write a short note on wind energy and its conversion. (10 Marks)

PART — ?

3. 1. Differentiate between reaction and impulse turbines. (05 Marks)

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   2. With a neat sketch, explain the working of the Pelton wheel. (10 Marks)
   3. Differentiate between a petrol engine and a diesel engine. (05 Marks)
4. 1. With a neat sketch, explain the working of a 4-stroke diesel engine. (10 Marks)
   2. With a neat sketch, explain the working of a closed cycle gas turbine. (06 Marks)

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   3. Define: Thermal efficiency and mechanical efficiency of an IC engine. (04 Marks)

PART — ?

5. 1. Name the various operations carried out on a lathe. (08 Marks)
   2. What is milling? With a neat sketch, explain end milling and plane milling operations. (06 Marks)

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   3. Differentiate between: (i) Counter sinking and counter boring, (ii) Reaming and Boring. (06 Marks)
6. 1. Define Robot. Write a classification based on robot physical configuration. Write down the applications of an industrial robot. (08 Marks)
   2. What is automation? Explain the types of automation with examples. (07 Marks)
   3. With a block diagram, explain the basic components of an NC system. (05 Marks)

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PART — D

7. 1. What are ferrous metals? Write a note on stainless steel. Write down its applications. (08 Marks)
   2. Differentiate between ferrous and non-ferrous materials. (06 Marks)
   3. What is soldering? Classify the soldering process. (06 Marks)

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8. 1. Define welding. Explain the electric arc welding process. Write down its demerits. (08 Marks)
   2. Differentiate between welding, brazing, and soldering. (06 Marks)
   3. Define composite materials. Write down its practical applications. (06 Marks)

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PART — E

9. 1. What are the required properties of a good refrigerant? (06 Marks)
   2. With a neat sketch, explain the working of a vapor compression refrigeration system. (10 Marks)
   3. What is air conditioning? Why is it necessary? (04 Marks)

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10. 1. Define: (i) Refrigeration effect (ii) Unit of Refrigeration (iii) COP of Refrigeration. (06 Marks)
    2. List the commonly used refrigerants. (04 Marks)
    3. Explain with a neat sketch the principle of a room air-conditioner. (10 Marks)

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