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Previous Question Papers
Academic year: 2020

- 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.TechII Semester Supplementary Examinations, October/November 2020

Engineering Chemistry (ME & AE) Roll No Time: 2 hours Max. Marks: 75 Answer Any F our Questions

All Questions carries equal marks .

1 a) What are the types of Electrodes . Explain constructi on and functioning of calomel, quinhydrone and glass electrodes?

2 a) Define EMF and electrode potential? Derive the Nernst equation and give its applications ?

b) What is hydrogen- oxygen fuel cell construction? And its functioning, advantages and applications.

3 a) What is the e lectro chemical corrosion ? Explain the mechanism of evolution of hydrogen?

b) Briefly explain the galvanic corrosion and f actors affecting rate of corrosion of nature of metal?

4 a) Write a brief note on galvanization & tinning b) What are the applications and advantages of electroless plating ?

5 What are the characteristics of good refractories? Give the c lassificatio n of refractories with examples and applications of refractories.

6 Define the c haracteristics and c lassification of a good lubricant with examples and their properties of lubricants .

7 a) Explain the treatment of boiler feed water w ith internal treatment .

b) Determination of hardness of water by EDTA method ?

8 a) What are the types of cracking and fixed bed catalytic cracking. Explain the Fischer -Tropsch‘s process ?

b) Define the fuel and good fuel? Explain the characteristics of a good f uel.

****** R15 Page 1 of 2 Code No: R15A0201 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY

(Autonomous Institution – UGC, Govt. of India) I B.TechII Semester Supplementary Examinations, October/November 2020 Electrical Circuits (ECE, CSE & IT) Roll No

Time: 2 hours Max. Marks: 75 Answer Any F our Questions All Questions carries equal marks .

*** 1 a) Differentiate between independent and dependent sources and draw their circuit representation.

1 b) State and Explain Ohm’s law and Kirchhoff’s law 2 Determine the current delivered by the source in the circuit shown in Fig. 2.

Fig. 2.

3 Explain about the incidence matrix and tricet matrix in detail.

4 Using mesh analysis, determine the voltage Vs which gives a voltage of 50V across the 10Ω resistor as shown in Fig. 4.

Fig. 4.

5 For a series resonant circuit with constant voltage and variable frequency, obtain the frequency at which voltage across the inductor is maximum. Calculate this R15 Page 2 of 2 maximum voltage when R=50 ohms, L=0.05H, C=20 micro farad and V=100

volts.

6 A series R -C cir cuit with R=10 ohms and C= 2F has a sinusoidal voltage source 200 𝑠𝑠𝑠𝑠𝑠𝑠(500𝑡𝑡 +∅ ) applied at time when ∅=0. (i) Find the expression for current (ii) At what value of ∅ must the switch be closed so that the current directly enter steady state.

7 State M aximum power transfer Theorem. For the circuit shown in Fig. 7 determine the value of R L to get the maximum power. Also find the maximum power transferred to the load.

Fig. 7 8 A 4 kVA, 200/400 V, 50 Hz, single phase transformer has equivalent resistance referred to primary as 0.15 Ω. Calculate, i) The total copper losses on full load ii) The efficiency while supplying full load at 0.9 p.f lagging

iii) The efficiency while supplying half load at 0.8 p.f. leading.

Assume total iron losses equal to 60 W.

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

I B.TechII Semester Supplementary Examinations, October/November 2020 Engineering Drawing (ME & AE) Roll No Time: 2 hours Max. Marks: 75

Answer Any F our Questions All Questions carries equal marks .

**** 1 (a) Construct a regular heptagon with a side of 30mm by general method (7M) (b) The foci of an ellipse are 90mm apart and the minor axis is 72mm long.

Determine the length of the major axis. Construct the ellipse and draw the tangent from any point outside the ellipse 2 (a) Construct a regular Octagon with a side of 30mm by general method (7M) (b) Construct an ellipse with a distance of focus from directrix as 50 mm and eccentricity as 2/3. In addition draw the tangent and normal to a curve at a point 40 mm from directrix

3 (a) A point A is 20mm above HP and in the first quadrant. Its shortest distance from the reference line XY is 40mm. Draw the projections of the point and determine its distance from VP.

(b) A line EF 60mm long is in VP and inclined to HP. The top view measures 45mm. The end E is 15mm above HP . Draw the projections and find the inclinations with HP.

4 The projectors of the ends of a line AB are 60mm apart. The end A is 2 0mm above the HP and 30mm in front of the VP. The end B is 10mm below the HP and 40mm behind the VP. Determine the true length and traces of AB, and its inclinations with the two planes.

5 A thin rectangular cord board lamina has one of its corners on th e HP and the surface makes 600 with HP. Draw the projections when the top view of the diagonal passing through the corner on HP, makes 450 with the reference line. The size of the lamina is 50X25 mm 6

A pentagonal pyramid of base edges 30 mm and axis 70 mm long has a corner of base on HP. Draw its projections when the slant edge through corner lies on HP and is parallel to VP 7 Draw the isometric projection of the frustum of a hexagonal pyramid of base edges 20 mm sides and top edges 8 mm sides and axis 55 mm long when its base

on HP. Two of the base edges are parallel to the VP.

8 Draw the following orthographic views of an object shown in the pictorial projection. (All dimensions are in mm) (i) Front view (ii) Top view and (iii) Side view R15 Page 2 of 2 **********

Page 1 of 1 Code No: R15A0012 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.TechII Semester Supplementary Examinations, October/November 2020

Engineering Physics-II (Common to all branches) Roll No Time: 2 hours Max. Marks: 75 Answer Any F our Questions

All Questions carries equal marks .

****** 1 What is cohesive energy? Assuming a suitable model for interatomic forces derive an expression for cohesive energy 2 Show that FCC crystals are close ly packed than SC and BCC structures 3 Derive Bragg’s law of X -ray diffraction?

4 Distinguish between Frenkel defects & Schottky defects 5 Derive an expression for electronic polarization in case of dielectric materials 6 Explain how are the ultras onic waves are produced by magnetostriction method 7 Distinguish between Type -I & Type -II superconductors 8 Describe the process of “sol -gel” in the fabrication of nano materials

****** R15 Page 1 of 1 Code No: R15A0022 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY

(Autonomous Institution – UGC, Govt. of India) I B.TechII Semester Supplementary Examinations, October/November 2020 Mathematics-II (Common to all branches) Roll No

Time: 2 h ours Max. Marks: 75 Answer Any F our Questions All Questions carries equal marks .

****** 1 a) Find a root of the equation x3- 4x – 9 = 0, using the Bisection method.

b) Find the positive root of x4 – x = 10, using Newton -Raphson method.

2 a) The table gives the distances in nautical miles of the visible horizon for the given heights in feet above the earth’s surface:

x(height): 100 150 200 250 300 350 400 y(distance): 10.63 13.03 15.04 16.81 18.42 19.90 21.27 Find the value of ‘y’ when x = 218 ft .

b) Given the values x: 5 7 11 13 17 y: 150 392 1492 2366 5202 Find the value of ‘y’ when x = 9 using Lagrange’s formula.

3 Evaluate ∫+1021xdx using (i) Trapezoidal rule taking h=1/4 and (ii) Simpson’s 1/3rd rule taking h=1/4.

4 a) Find by Taylor’s series method the value of y at x=0.1 to three places of decimals from .1)0(,12=−= y yxdxdy b) Fit a straight line that best fits the following data:

x: 1 2 3 4 5 y: 14 27 40 55 68 5 If x xf cos)(= , expand )(xf as a Fourier series in the interval ).,(ππ− 6 Expand xexf−=)( as a Fourier Series in the interval (-l, l).

7 Solve (x2-yz)p + (y2-zx)q = z2-xy.

8 a) Find the directional derivative of ϕ = x2yz + 4xz2 at the point (1, -2, 1) in the direction of the vector 2 i – j – 2k.

b) Show that div(grad rm) = m(m+1)rm-2, where r = │r│, r = xi + yj + zk ****** R15 Page 1 of 1 Code No: R15A0502

MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.TechII Semester Supplementary Examinations, October/November 2020 Object Oriented Programming (Common to all branches )

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

**** 1 Explain the member functions of ISTREAM class with an example 2 Differentiate among Pass by value, pass by reference and pass by address with the help of a suitable program?

3 Describe the read and write functions, their prototype, use and the way input and output data?

4 Write a recursive program for finding the GCD between two numbers.

5 Write a C++ Pro gram for Dynamic Initialization using constructors 6 What is virtual base class? Write a C++ program illustrating virtual base Classes?

7 Describe the three different inheritance behaviors achieved through the use of pure virtual, ordinary virtual and non virtual functions?

8 Write a program containing a possible exception. Use a try block to throw it and a catch block to handle it properly?

****** R15