JNTU
JNTU B.Tech II FUELS, FURNACES AND REFRACTORIES Previous Question Paper (December - 2018 - R13)
Note: This question paper contains two parts A and B. 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.
Part A
What is fission? Explain with an example.
Answer
Fission is a nuclear reaction in which the nucleus of a heavy atom splits into two or more smaller nuclei, releasing a large amount of energy. A common example is the fission of Uranium-235, which splits into Barium and Krypton upon bombardment by a neutron.
Explain about the nuclear chain reaction.
Answer
A nuclear chain reaction occurs when the neutrons released during the fission of one nucleus trigger the fission of other neighboring nuclei. This process becomes self-sustaining if at least one neutron from each fission event causes another fission, leading to a continuous release of energy.
Define thermal conductivity. Give its importance.
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What is steady state heat transfer? Explain with an example.
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What do you mean by heat balance in a furnace?
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Where do the continuous furnaces used? Explain with an example.
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What are the noble metal thermocouples?
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Explain Seebeck effect.
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What is pyrometric cone equivalent test?
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What are monolithic bricks? Explain with an example.
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Part B - Unit I
Explain the production of metallurgical coke.
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Explain its composition and properties and uses of producer gas.
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Explain the principles of production of fuels from crude.
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Part B - Unit II
A cylindrical tube of inside radius (r1) and outside radius (r2) is lagged by insulating material with r3 as the outer radius of insulation. Derive the expression for rate of heat flow.
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Derive an expression for heat conduction in a cylindrical coordinate system.
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The inner surface of a nickel-steel cylinder (k=19 w/mK) of inner diameter is 1 cm and outer diameter is 7 cm is maintained at a constant temperature of 1100C, while the outer surface is held at 500C. Calculate the heat lost per meter length of the pipe.
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Derive an expression for heat conduction through anisotropic materials.
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Part B - Unit III
Describe the principle and operation of reverberatory furnace with the help of a neat sketch.
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Distinguish between direct and indirect arc furnace.
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What are the advantages, drawbacks and applications of an electric furnace?
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Part B - Unit IV
Explain Peltier effect.
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What are the sources of error in radiation pyrometer? Discuss.
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What are base metal thermocouples and nobel thermocouples? Explain with examples.
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Explain the factors which affect the readings of optical pyrometer.
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Part B - Unit V
Compare and contrast between acid, basic and neutral refractories.
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Distinguish between tridimite and crystabolite.
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Explain the method of manufacture, composition, properties and applications of magnasite refractories.
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