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Previous Question Papers
Academic year: 2021.0

- R15 I YEAR I SEM SUPPLEMENTARY, JUNE 2022
- R18 I Year I Sem Supplementary, June 2022
- R20 I Year I Sem Supplementary, October 2022
- R20 I Year I Sem Regular, July 2021
- R18 I Year Isem Supplementary, October 2020
- R18 I Year I Sem Regular-Supplementary, December 2019
- R18 I Year I Sem Supplementary, February 2021
- R18 I Year I Sem Supplementary, July-August 2021
- R17 I Year I Sem Supplementary, December 2019
- R17 I Year I Sem Supplementary, February 2021

Page 1 of 1 Code No: R15A0013 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.Tech I Semester Supplementary Examinations, February 2021

Engineering Chemistry (ECE, CSE & IT) Roll No Time: 2 hours 30 m in Max. Marks: 75 Answer Any F ive Questions

All Questions carries equal marks .

1 Write the construction and working of Calomel electrode with neat diagram and proper reactions involved in it. [15M] 2 Write a brief note on construction, working and reactions involved in lead acid battery . [15M] 3 Discuss the chemical and electrochemical theories of corrosion. [15M]

4 a. Write the procedure involved in Electroplating of Cu.

b. Define hot dipping and explain the process of Galvanisation using neat diagra m [7M] [8M] 5 Write a detailed note on various types of Polymerization. [15M] 6 Write a short note on following properties of lubricants

i. Cloud point ii. Pour point iii. F lash and fire points. [15M] 7 How hard water is softened by Ion exchange process? Explain in detail with neat diagram. [15M] 8 Write the steps involved in refining of petroleum with neat sketch. [15M] ******

R15 Page 1 of 2 Code No: R15A0302 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India)

I B.Tech I Semester Supplementary Examinations, February 2021 Engineering Drawing (ECE, CSE & IT) Roll No Time: 2 hours 30 min Max. Marks: 75

Answer Any F ive Questions All Questions carries equal marks .

**** 1 Construct a parabola when the distance between the focus and directrix is 30mm.Draw the tangent and normal at the any point on the curve [15M] 2 Draw a hypocycloid of a circle of 40 mm diameter which rolls inside another circle of 200 mm diameter for one revolution. Draw a normal and tangent at any

point on it [15M] 3 Draw the projections of the following points on a common reference line:

(i) P, 40 mm below HP and in the VP (ii) Q, 35 mm behind VP and in the HP (iii) R, 25 mm below HP and 25 mm in front of VP (iv) S, 30 mm behind VP and 45 mm below HP. (v). Point A lies in the H.P. and 22 mm in front of the V.P.

(vi). Point B lies 20 mm behind the V.P. and 32 mm above the H.P.

(vii). Point C lies 32 mm below the H.P. and 22 mm in front of V.P.

[15M] 4 The projections of the ends of a line EF are on the same projector. The end E is 10 mm above HP and 15 mm in front of VP. The end F is 35 mm above HP and 45 mm in front of VP. Draw the projections. Find the true length, true inclinations

and traces [15M] 5 A Hexagonal lamina of 20 mm side rests on one of its corners on the HP. The diagonal passing through this corner is inclined at 450 to the HP. The l amina is then rotated through 900 such that the top view of this diagonal is perpendicular to

the VP and the surface is still inclined 450 to the HP. Draw the projections of the lamina [15M] 6 Draw the top and front views of a rectangular pyramid of side s of base 40 Χ50 mm and height 70 mm when it lies on one of its larger faces on HP.The longer edge of the base of the triangular face lying on HP is inclined at 600 to VP in the top view

with the apex of the pyramid being nearer to VP. [15M] 7 A hollow cylinder of bas e 50 mm diameter and axis 7 0 mm long has a square hole of 20 mm side. The axi s of the cylinder and the hole coincide. Draw the three possible ways of representing the isometric projection of the solid [15M] 8 Draw Front view, top view and side view of a given object (All dimensions are in

mm) [15M] R15 Page 2 of 2 ********** Page 1 of 2 Code No: R15A0301

MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.Tech I Semester Supplementary Examinations, February 2021 Engineering Mechanics (ME & AE )

Roll No Time: 2 hours 30 min Max. Marks: 75 Answer Any F ive Questions All Questions carries equal marks .

*** 1(a) (b) Find the resultant of the force acting on a particle P as shown in Fig:1 Fig:1 Three collinear horizontal forces of magnitude 150N, 450N and 300N are acting

On a rigid body. Determine the resultant of forces when (i) all the forces are acting in the same direction; (ii) the force of 300N act in the same direction. [5+10M] 2(a) (b) Explain how will you reduce the system of coplanar, non -concurrent forc es to a force and a couple?

What do you understand by the term ‘Couple’? Discuss the characteristics of a couple [8+7M] 3 Two smooth cylinders with diameters 250 mm and 400 mm respectively are kept in a groove with slanting surfaces making angles 600 and 300 as shown in the

Figure 2 . Determine the reactions at contact points A, B and C.

Figure 2 [15M] 4 An effort of 200N is required just to move a certain body up an inclined plane of angle 150, the force acting parallel to the plane. If the angle of inc lination of the plane is made 200, the effort, required, again applied parallel to the plane, is found to be 230N.Find the weight of body and the Co -efficient of friction [15M]

5 Locate the centroid of an I -section about X -X axis as shown in the figure -3. [15M] R15 Page 2 of 2 figure -3 6 Using the analytical Method, determine the centre of gravity of the plane lamina of given Fi g:4

Fig:4 [15M] 7 Find area moment of inert ia of L section shown in Figure about X axis [15M] 8 Two bodies of weight 60N and 40N are con nected to the two ends of alight in extensible string. The string is passing over a smooth pulley. Determine :

(i) the acceleration of the system (ii)the tension in the string. Take g=9.8m/s2 [15M] ****** Page 1 of 1 Code No: R15A0011

MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.Tech I Semester Supplementary Examinations, February 2021 Engineering Physics -I (ME, ECE, CSE, IT & AE)

Roll No Time: 2 ho urs 30 min Max. Marks: 75 Answer Any F ive Questions All Questions carries equal marks .

**** 1 Discuss the phenomenon of i nterference in thin films by reflected light . Obtain the conditions for maxima and minima . [15M] 2 Derive an expression for the intensity distribution due to diffraction at a single slit. [15M] 3 Explain principle, construction and working of Semiconductor laser with the help

of Energy Level Diagram. [15M] 4 Define Numerical Aperture and Acceptance angle. Derive the expressions for them. [15M] 5 Derive an expression for Schrodinger time independent wave equation. [15M] 6 Describe Davisson and Germer experiment to verify the wave nature of matter. [15M]

7 a) Compare the highlights of M -B, F-D & B -E distributions.

b) Explain For mation of energy bands in solids by using Band theory of solids. [10M] [5M] 8 Explain the principle, construction and working of solar cell with necessary diagrams and mention its characteristics. [15M] ******

R15 Code No: R15A0021 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.Tech I Semester Supplementary Examinations , February 2021

Mathematics -I (ME, ECE, CSE, IT & AE) Roll No Time: 2 hours 30 min Max. Marks: 75 Answer Any F ive Questions

All Questions carries equal marks .

1 a) Reduce the given matrix into normal form and hence find the rank �234 3−1−5 −2

26 50−5 147�.

b) For a matrix 𝐴𝐴 = �12−303 200−2� find the Eigen values of 3𝐴𝐴3+5𝐴𝐴2−6𝐴𝐴+2𝐼𝐼.

[8M+7M] 2. If 𝐴𝐴= �1 2−12 1−22−2 1� verify Cayley -Hamilton theorem. Find 𝐴𝐴−1 using Cayley- Hamilton theorem. [15M]

3. a) Prove that 𝜋𝜋6+15√3<𝑠𝑠𝑠𝑠𝑠𝑠−1�35�<𝜋𝜋6+18.

b) Find minimum values of 𝑥𝑥2+𝑦𝑦2+𝑧𝑧2 if 𝑥𝑥+𝑦𝑦+𝑧𝑧=3𝑎𝑎. [8M+7M] 4 .a) V erify Rolle’s Theorem for 𝑙𝑙𝑙𝑙𝑙𝑙�𝑥𝑥2+𝑎𝑎𝑎𝑎𝑥𝑥(𝑎𝑎+𝑎𝑎)� on [a,b], b > a > 0.

b) Using Taylor’s series expand 𝑓𝑓(𝑥𝑥,𝑦𝑦)= 𝑒𝑒𝑦𝑦log (1+𝑥𝑥) in powers of x and y. [ 7M+8M] 5. a) Solve 𝑥𝑥3𝑠𝑠𝑒𝑒𝑠𝑠2𝑦𝑦𝑑𝑑𝑦𝑦𝑑𝑑𝑥𝑥+3𝑥𝑥2𝑡𝑡𝑎𝑎𝑠𝑠𝑦𝑦 =𝑠𝑠𝑙𝑙𝑠𝑠𝑥𝑥 .

b) If the surroundings are maintained at 30℃ and the temperature of body cools from 80℃ to 60℃ in 12 minutes, find the temperature of body after 24 minutes. [7M+8M] 6 a) Find the orthogonal Trajectory of the family of 𝑎𝑎𝑦𝑦2=𝑥𝑥3.

b) I f the population is increasing exponentially at the rate of 2% per year. What will be the percentage increase over a period of 10 years? [ 8M+7M] 7. Apply the method of variation of parameters to solve𝑑𝑑2𝑦𝑦𝑑𝑑𝑥𝑥2+𝑦𝑦=𝑡𝑡𝑎𝑎𝑠𝑠𝑥𝑥. [1 5M] R15

8. Solve 𝑑𝑑2𝑥𝑥𝑑𝑑𝑑𝑑2+2𝑑𝑑𝑥𝑥𝑑𝑑𝑑𝑑+5𝑥𝑥= 𝑒𝑒−𝑑𝑑𝑠𝑠𝑠𝑠𝑠𝑠𝑡𝑡,𝑥𝑥(0)=0,𝑥𝑥′(0)=1 by using Laplace Transform. [15M] *** Page 1 of 1

Code No: R15A0501 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.Tech I Semester Supplementary Examinations, February 2021 Computer Programming with C

(ME, ECE, CSE, IT & AE) Roll No Time: 2 hours 30 min Max. Marks: 75 Answer Any F ive Questions All Questions carries equal marks .

*** 1 a) Sketch the structure of C program and explain.

b) Elucidate how do you create and r un a C program [7M] [8M] 2 Illustrate the standard data types suppo rted by C language . [15M] 3 a) Distinguish between actual and formal p arameters with an example.

b) Differentiate between call by value and call by reference with an example [7M] [8M] 4 Describe the following with examples:

i. Function definition ii. Function c all iii. Function declaration. [15M] 5 Define array . Explain the declaration and initialization of one dimensional and two dimensional array with an example [15M]

6 a) Explain declaration and initiali zation of array of strings.

b) Develop a C program to f ind whether a given string is palindrome or not. [7M] [8M] 7 Briefly e xplain the concept of functions returning pointers with example. [15M] 8 Exemplify the following: i. Self -referential structure ii. Typedef declarations iii.

Enumerations, iv. Union [15M] ****** R15 Page 2 of 1