JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV ELECTROMETALLURGY AND CORROSION Previous Question Paper (November/December - 2018 - R15)
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. Each question carries 10 marks.
Part A
What is cell potential?
Answer
Cell potential is the measure of the potential difference between two electrodes in an electrochemical cell, representing the driving force that pushes electrons through the external circuit from the anode to the cathode.
What is EMF? Define it.
Answer
Electromotive Force (EMF) is the maximum potential difference between two electrodes when no current flows through the cell. It is defined as the algebraic sum of the reduction potential of the cathode and the oxidation potential of the anode.
How galvanic series is different from the electrochemical series?
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What are temperature cells?
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Give examples of Galvanic corrosion.
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Explain the effects of pitting corrosion.
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Write two uses of inhibitors in preventing the corrosion.
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Explain the effect of pH to the rate of corrosion.
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What is cathodic coating? Explain.
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What is the Effect of oxidative environment to the rate of corrosion?
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Part B
Explain the Faraday’s law of electromagnetic induction.
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Describe the electroplating mechanism by giving example.
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Explain two testing methods of electro deposits.
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Give the basic principle of corrosion with the help of electrochemical corrosion.
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Derive and explain the Nernst equation.
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Explain the characteristics and formation of concentration cell.
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Explain how the pourbauix diagram is helpful to decide the corrosion characteristics of metals.
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What is exchange potential theory? Explain it.
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What is Crevice corrosion? Explain with suitable examples.
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Explain the terms: i) Uniform attack ii) Knife line attack.
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Explain the beneficial applications of galvanic corrosion.
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What is fretting corrosion? Explain with suitable examples.
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Write short note on: i) Sacrificial anodic protection ii) Role of pure metal in prevention of corrosion.
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Explain metal cladding in detail.
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Explain the impressed current cathodic protection with examples.
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Corrosion protection by proper designing. Explain the statement.
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Explain the high temperature corrosion in detail.
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Discuss the high temperature oxidation with some practical examples.
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Write the applications of organic coatings.
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Explain significance of Pilling Bed-worth ratio to the rate of corrosion.
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