metallurgical analysis rr

8/14/2019 Metallurgical Analysis Rr

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Code No: RR11801 Set No. 1

I B.Tech Supplimentary Examinations, Aug/Sep 2007METALLURGICAL ANALYSIS

(Metallurgy & Material Technology)Time: 3 hours Max Marks: 80

Answer any FIVE QuestionsAll Questions carry equal marks

1. (a) What is the difference between the gross sample and the laboratory samplewith reference to solids?

(b) Describe various methods of reduction of bulk sample. [8+8]

2. (a) What is a borax bead test? How is it carried out? Give the applications ofthis test for qualitative analysis. [7]

(b) Mention the spot test analysis for the following

i. Al

ii. Ni

iii. Mo [3x3=9]

3. (a) Explain the procedure for Zn determination in Brass by Gravimetric method.

(b) How is Cu estimated from the Sn-base solders. [8+8]

4. (a) With a neat sketch explain Sulfur estimation in steels by evolution method.

(b) Describe the procedure for Mo determination by Volumetric method in steel.[8+8]

5. (a) Explain the influence of impurities on the losses of precious metals duringcupellation.

(b) Explain the errors resulting from parting operations. [9+7]

6. (a) What are Nessler tubes. In which method of metallurgical analysis these tubesare being used. Describe the tubes fully, also explain its usages.

(b) Briefly explain the theory of colorimetry. [9+7]

7. (a) Explain determination of fluoride with standard thorium nitrate solution.

(b) What is the advantage of replacing the dropping mercury electrode by an inertplatinum electrode?

(c) Give an account on determination of zinc with EDTA. [5+6+5]

8. (a) With a neat sketch, discuss electrolytic separation of metals with controlledcathode potential.

(b) Explain the effect of stirring during electrolysis. [10+6]

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2. (a) What is a flame test? How is it carried out? How are the following identifiedby flame test?

i. Cu

ii. Ca

iii. K

iv. Sr

(b) Give an account of IIIrd group cation analysis. [10+6]

3. (a) How is Aluminium content determined in Aluminuim bronzes.

(b) Describe the process of determination of Managanese in silicon bronzes.[8+8]

4. (a) Describe the procedure for determination of Phosphorous in Iron by Gravi-metric method.

(b) How is the combined carbon estimated by Colorometry technique? [8+8]

5. (a) Explain how parting of gold and silver is done using nitric acid.

(b) Explain briefly the different types of reaction vessels used for parting. [10+6]

6. (a) Explain in detail any one of the colorimetric methods.

(b) Explain the important basic principles of chemical analysis.

(c) List the advantages of using photoelectric cells in colorimetric analysis.[5+5+6]

7. (a) Give an account on the preparation and the use of the hydrogen electrode.

(b) What are pH meters? Discuss mode of operation. [8+8]

8. (a) What are the advantages of dropping mercury electrode?

(b) What are the factors affecting the limiting current with a dropping mercurycathode? Briefly discuss each one of them. [7+9]

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2. Write in detail the qualitative analysis of cations. Give suitable examples andreactions.

[16]

3. (a) Describe the procedure for Sn estimation in Cu alloys by Gravimetric method.

(b) Explain Zn estimation by volumetric method in Brass. [8+8]

4. (a) Discuss the various methods for the estimation of Cr in alloy steels.

(b) How is Phosphorous in Iron determined by Volumetric method. [8+8]

5. (a) Explain how the Ferrous Iron and Ferric Iron contents ore estimated in ironores.

(b) What are the important ores of iron. Give their chemical formulae. [8+8]

6. (a) Give a detailed account of the standards used in standard series method.

(b) What is duplication method? When can this method be applied? Explainthis method briefly. [7+9]

7. (a) Give an account on the preparation and the use of the hydrogen electrode.

(b) What are pH meters? Discuss mode of operation. [8+8]

8. (a) Name the two methods used for determination of cadmium in solution andbriefly explain both of them.

(b) Discuss the nature of alternating current polarography. [9+7]

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metallurgical analysis rr

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