IV B.Tech I Semester Regular Examinations,Nov/Dec 2009 CORROSION ENGINEERING Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Explain flame spraying in detail.
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2. Explain concentration polarization in detail. 3. Write short notes on the following: (a) Cavitation damage. (b) Fretting corrosion.
[8+8]
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4. Explain vapor phase inhibitors.
5. (a) Discuss various corrosion rate expressions with their merits and demerits. (b) Iron is corroding uniformly at a rate of 35 mdd. What is the corrosion rate in mm/year? Specific gravity of iron is 7.87. [16]
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6. (a) Explain how aeration is checked in corrosion testing.
(b) What is the influence of aeration in corrosion testing results?
[10+6]
7. Explain the various terms involved in consideration of economical aspects involved in corrosion. [16] 8. Explain in detail EMF and galvanic series.
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Code No: 37065/37066
R05
Set No - 2
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IV B.Tech I Semester Regular Examinations,Nov/Dec 2009 CORROSION ENGINEERING Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Write Nernst equation and name all the terms. Where do we use this equation? [16]
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2. What is anodic protection? What is a potentiostst? Give some examples.
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3. Write down the important properties of metals that have impact on corrosion.[16]
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4. (a) Explain the effect of cathode-anode area on electrochemical corrosion of a galvanic couple of dissimilar metals. (b) Compare galvanic series with EMF series.
5. Explain the effects of various inhibitors on corrosion resistance.
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6. Explain the various environmental factors that contribute to formation of various forms of corrosion. [16] 7. Can the depth of pit in selection to the exposed area and number of pits be an indication for evaluating pitting damage? Explain. [16]
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8. What are the various exposure techniques that support the testing of specimen in the laboratory? [16]
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Code No: 37065/37066
R05
Set No - 3
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IV B.Tech I Semester Regular Examinations,Nov/Dec 2009 CORROSION ENGINEERING Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Explain the mechanism of crevice corrosion.
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2. Describe a half cell and a standard half cell.
3. Describe the anodic protection of a steel storage tank filled with sulphuric acid. [16]
4. Explain the corrosion resistance of copper, and aluminium to the atmosphenic corrosion.. [16]
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5. (a) What is the minimum test time for checking results of corrosion?
(b) Explain the importance of planned interval tests for corrosion testing. [6+10] 6. (a) Explain the effect of oxidizers on electrochemical behaviour of an active- passive metal.
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(b) Explain corrosion rate.
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7. Explain the electro-chemical reactions involved corrosion of metals, in air free hydrochloric acid in case of copper. [16] 8. (a) Explain what is meant by stress corrosion. (b) Explain the morphology of stress corrosion.
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(c) What are the metallurgical factors involved in stress corrosion?
3
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Code No: 37065/37066
R05
Set No - 4
1. Discuss the effects of corrosive concentration on corrosion.
3. Explain free energy change in a reversible cell.
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2. What are oxidizing agents? Explain their effect on corrosion rate.
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IV B.Tech I Semester Regular Examinations,Nov/Dec 2009 CORROSION ENGINEERING Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
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4. How are AC impedance methods useful in determining the mechanism of corrosion process? [16]
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5. Write the corrosion phenomena on austenitic stainless steels. 6. Explain the factors affecting corrosion resistance of metals.
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[16]
7. Discuss the cathodic protection of a underground tank using impressed currents. [16]
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8. Presence of noble electrode and active electrode involve in a form of corrosion. What is the type of corrosion and what is the mechanism? Explain. [16]
(b) Fretting corrosion. [8+8] · 4. Explain vapor phase inhibitors. [16] · 5. (a) Discuss various corrosion rate expressions with their merits and demerits. (b) Iron is ...
6. (a) Explain the various functions and tables associated with Ring station and · Source routing group of RMON token ring. (b) Explain the different alarms and ...
where you are studying. Write CSS rule such that there are three different para- · graph styles p1, p2 and p3. p1 style must use left and right margins of 20 pixels, ...
heit (oF),converts in to an absolute temperature in kelvins · T(oK) = 5/9[t(oF)-32.0]+273. [16] · 6. Sketch an inverse Nyquist plot for a system with g(s) =.
(b) How fast can the output of an Op-amp change by 10V, if its slew rate is · 1V/µs? .... (b) Explain the application of 555 timer as Linear ramp generator. [8+8].
How can you find virus concentration both directly and indirectly by particle counts · and measurement of infectious unit concentration. Define plaque forming ...
(b) Explain with a neat block diagram the operation of a continuously variable .... (a) Draw the block diagram of band pass binary data transmission system and.
(b) Describe the effect of lack of fusion in butt, fillet and lap welded joints. ... 8. (a) Describe the process of welding dissimilar metals by fusion welding technique?
[16] · 4. A chemical process is represented by the following set of equations : f1(x3,x4)=0 · ; f2(x5,x2) =0 ; f3(x6) = 0 ; f4(x6,x1) = 0 ; f5(x3,x2) = 0 & f6 (x4,x5,x1) =0.
Explain. [8+8] · 2. Describe the different databases available for storage of protein resources. [16] ... acid sequence as query. The only reported match has an E ...
A steel bolt of 650 sq.mm C.S.A passes centrally through a copper tube of .... 6. A wagon of weight 25 k N, attached to a wire rope, is moving at speed of 4 km.
Explain in detail how transposable elements could be used to clone the genes. [16] · 7. Write in detail about ISSR molecular markers and its applications. [16].
(a) With a neat sketch explain the generation of action potentials. (b) List out different bio electric potentials. (c) Explain how bio electric potentials are measured.
(b) Break-Even Point in Rupees,. (c) Margin of Safety. (d) It is proposed to reduce the selling price by 20%. What extra units should be sold to obtain the same ...
(b) Explain briefly about the threat's to data integrity and confidentiality. [8+8] · 5. Describe different clinical applications of computers in nuclear medicine. [16].
(b) Evaluate. â. â«. 0 dx. (1+x2)2 using residue theorem. [8+8]. 8. (a) Evaluate using Cauchy's Integral Formula â«. C. (z+1) dz. (z3â4z) where C is |z + 2| = 3. 2.
Code No: 35051. R05. Set No - 2. 6. (a) Obtain the state-space representation of the system given by the transfer func- · tion. (Conanical form of state space model) · Y (S) · U(S) · = T (S) = · 1 · (S+1)(S+2)(S+3) · (b) A system is characterized by
[16] · 4. What are channel,circuit and half circuit in the context of satellite telemetry sys- .... 3. Describe the conditions for total internal reflection within a fibre. [16].
(b) Describe a DC Servo Motor with a neat sketch. [8+8] · 4. (a) What is a timing belt? Discuss the use of Timing belts in power transmission? (b) Discuss various ...
(b) Consider any two networks of your choice which support Circuit switching or ... (b) Which is more efficient, circuit switching or packet switching? Why?
(a) What is the difference between logical I/O and device I/O? (b) Explain feed back scheduling policy. [8+8] · 2. (a) How can logical address space be ...
kerosene, and fuel oil must be limited as also shown in this table. There are no ... equipment is a function of x, the size (horsepower ) of the motor, namely.
