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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 2 Code No: R17A0013 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.Tech II Semester Supplementary Examinations, October/November 2020

Engineering Chemistry (Common to ME & AE) Roll No Time: 2 hours Max. Marks: 70 Answer Any F our Questions

All Questions carries equal marks .

*** 1 a. Derive the Nernst Equation for single electrode potential. Write the Nernst equation for cell EMF .

b. A conductance cell containing 0.01N KCl solution was found to have a resistance of 2573 ohms at 25oC. The same cell when filed with a solution of 0.2N acetic acid had a resistance of 5085 ohm. Calculate the cell constant, specific conductance and equivalent conductance of acetic acid. (Given kv of 0.01N KCl is 0.00141 ohm-1cm-1)

c. Explain the construct ion and working of calomel electrode.

2 a. What is a Galvanic cell? Describe the construction, working of a Daniel cell with cell diagram, cell representation and electrode reactions.

b. Explain the construction, functioni ng and applications of Hydrogen – Oxygen Fuel cell.

3 a. Define Corrosion. Describe the causes and effects of corrosion.

b. Explain the mechanism involved in the rusting of iron in acidic medium with diagram.

4 a. Explain in detail various factors that influ ence rate of corrosion.

b. What is meant by metal cladding ? Explain the process and its significance .

5 a. Differentiate between chain polymerisation and step polymerisation with examples.

b. What are conducting polymers? How the conductance of polyacetylene ca n be increased by p -doping and n- doping? Explain with mechanism.

6 a. Write a short no te on Fibre Reinforcing P lastics and mention their applications.

b. Write an account of preparation, properties and uses of i. Buna -S rubber ii. Poly vinylacet ate c. Write the classification of refractories with examples.

7 a. Explain the zeolite process for the external treatment of boiler feed water.

What are its limitations and advantages ?

b. Write a brief account of break point chlorination and mention its significance.

c. What is Calgon conditioning ? Mention the reactions involved. R17 Page 2 of 2 8 a. Explain the ultimate analysis of coal and its significance.

b. Explain the process of refining of petroleum.

********** Page 1 of 2 Code No: R17A0201 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India)

I B.Tech II Semester Supplementary Examinations, October/November 2020 Electrical Circuits (EEE,ECE,CSE&IT) Roll No Time: 2 hou rs Max. Marks: 70

Answer Any F our Questions All Questions carries equal marks .

*** 1 a) Three resistances of values 2Ω,3Ω and 5Ω are connected in series across 20V DC supply. Calculate i) Equivalent resistance of the circuit. ii) The total current of the circuit.

iii) The voltage drop across each resistor. iv) The power dissipated in each resistor b) Illustrate the classification of electrical circuit elements.

2 a)Derive the equation for energy stored in the capacitor and Inductor b) Explain about source transformation techniques 3 Determine the current in the 4Ω branch in the cir cuit shown in Fig below by using mesh analysis method.

4 Derive the Star–to-Delta and Delta -to-Star Transformation.

5 a) Derive the Steady State Analysis of series R -C circuits b) Define Average value and R.M.S. value 6 a)A series RLC circuit containing a resistance of 20Ω, an inductance of 0.25H and a capacitor of 50 µF are connected in series across a 120V, 50Hz supply. Calculate the total circuit impedance, the circuits current, power factor.

b) Define form factor and pe ak factor 7 a) Verify the Reciprocity theorem for the network shown in figure below.

b) State the superposition theorem with an example .

R17 Page 2 of 2 8 a) Two coils A and B with self inductances La and Lb respectively are connected in series. If the mutual inductance is M, find equivalent inductance.

b) ) Establish the relation between polarity of the windings and dot convention with the help of diagram.

********** Page 1 of 2 Code No: R17A0302 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India)

I B.Tech II Semester Supplementary Examinations, October/November 2020 Engineering Drawing (ME&AE) Roll No Time: 2 hours Max. Marks: 70

Answer Any F our Questions All Questions carries equal marks .

**** 1 The major axis of an ellipse is 150 mm long and the minor axis is 100 mm long.

Find the foci and draw the ellipse .Draw a tangent to the ellipse at a point 25mm above the m ajor axis 2 A circle of 30 mm diameter rolls on circumference of another circle of 125mm diameter and outside it; trace the locus of a point on the circumference of the rolling circle for one complete revolution. Name the curve. Draw tangent and a

normal to the curve at any point from the center of the directing circle.

3 Draw the projections of a straight line PQ when it is inclined at an angle of 300 to HP and 450 to VP. The length of the straight line is 90 mm and the end P is 20 mm above HP and 10 m m in front of VP.

4 The midpoint of a straight line AB is 60mm above HP and 50m m in front of VP.

The line measures 80mm long and inclined at 300 to HP and 450 to VP. Draw its projections 5 Draw the projections of a regular pentagon plane of 25mm side, with its surface making an angle of 450 with HP. One of the sides of the pentagon is parallel to HP and 15 mm away from it.

6 A cylinder of 30 mm base diameter and 60 mm axis rests on HP with a point of its base such that the axis is inclined at 300 to HP. Draw its projections.

7 A sphere with a 50 mm diameter rests centrally over a cube with a 60 mm side.

Draw its isometric projection. R17 Page 2 of 2 8 Draw top, front and side views of the isometric projection given in figure All dimensions are in mm.

****** **** Page 1 of 1 Code No: R17A0012 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: 70

Answer Any F our Questions All Questions carries equal marks .

*********** 1 (a) Derive an expression for cohesive energy between two atoms.

(b) What are primary bounds? E xplain in detail.

2 (a) Derive an expression for inter planar distance in cubic crystal.

(b) In detail explain the f orces between atoms.

3 (a) Derive an equation of Bragg’s law.

(b) Explain Burger’s vector.

4 (a) Write a note on point defects.

(b) Describe Laue’s method of X -ray diffraction.

5 Drive an expression for Electronic polarizability.

6 (a) What is Ferro electricity? Explain its properties.

(b) What are applications of dielectric materials?

7 Write a note on Dia, Para, Ferro, An ti-ferro and Ferri magnetic materials.

8 (a) What is Quantum confinement? Discuss in detail.

(b) Illustrate are the a pplications of Nano materials?

********** R17 Code No: R17A0014 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India)

I B.Tech II Semester Supplementary Examinations, October/November 2020 Environmental Studies (Common to EEE, ECE,CSE & IT) Roll No Time: 2 hours Max. Marks: 70

Answer Any F our Questions All Questions carries equal marks .

******** 1 a. Differentiate Ecology and Eco -System. Explain the Food Chains, Food Websand Ecological Pyramids of an eco -system with Suitable examples.

b. Define Bioaccumulation and Bio magnification.

2 a. Explain the Nitrogen cycle with a neat diagram.

b. Discuss Producers, Consumers and Decomposers of Eco -system.

3 a. Classify the Resources. Discuss the advantages and limitations of Dams.

b. Non-renewable resources are major contributors of Environmental Pollution – Justify with your answer .

4 a. Define Deforestation .How deforestation leads to desertification – Explain in your Words with examples.

b. Write a detailed note on renewable energy resources and its role in reducing the pollution levels.

5 Define Biodiversity .Explain the consumptive, social, productive , ethical, aesthetic and optional use values of bio-diversity .

6 a. What is meant by Hot -spot? Elaborate the two important hot -spots of India.

b. Discuss the major Threats for loss of Biodiversity.

7 Write a brief note on following Green House Effects Climate change and its impacts Types of Pollutions 8 a. Explain the role of Environment Management Plan in EIA preparation

report.

b. Define Sustainable Development. Write a note on causes and threats of Sustainable Development.

********** Page 1 of 1 R17 Page 1 of 2 Code No: R17A0022 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY

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

Time: 2 hours Max. Marks: 70 Answer Any F our Questions All Questions carries equal marks .

.***** 1 a) Find a real root of the equation 2𝑥𝑥−𝑙𝑙𝑙𝑙𝑙𝑙𝑥𝑥 =7 by Rugula -falsi method.

b) Prove that ++=∆412122 δδδ

2 a) Derive a working formula to find cube root of a number and using it calculate cube root of 136.

b) Fit the interpolation polynomial for the following data x 0 1 4 5 f(x) 4 3 24 39 3 a) Fit a second degree polynomial to the following data by method of least squares:

x 0 1 2 3 4 y 1 1.8 1.3 2.5 6.3 b) Use R unge -Kutta fourth order method to find y(0.4) given y(0) =1 and xyxydxdy

+−= taking h = 0.2 4 a) Evaluate ∫+6021xdx

by using a) Trapezoidal rule b) Simpson’s 1 /3 rd rule b) Fit a curve of the form y =aebx to the data R17 Page 2 of 2

x 0 1 2 3 y 1.05 2.10 3.85 8.30 5 a) Find the Fourier series of the periodic function as defined as f(x)=�−π in−π<𝑥𝑥<0x in 0<𝑥𝑥<𝜋𝜋

Hence deduce that 112+132+152+ …=π28

b) Find the Fourier sine series for f(x)=2x−x2 in 0

6 a) Find the Fourier series expansion for function f(x)=|cosx| ,−π<𝑥𝑥<𝜋𝜋 b) Find the half range sine series for f(x)=ax+b,in 0<𝑥𝑥<1 7 a) Solve x2(y−z)p+y2(z−x)q=z2(x−y) b) Solve x2p2+y2q2=z2 8 a) Find Inverse Laplace transform of s

(s2+a2)2 , using Convolution theorem.

b) Solve (D2+1)y=6cos2t ,t>0,𝑦𝑦(0)=3,y′(0)=1 , using Laplace transform.

********** Page 1 of 1 Code No: R17A0502 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India)

I B.Tech II Semester Supplementary Examinations, October/November 2020 Object Oriented Programming Through C++ (Common to all branches ) Roll No Time: 2 hours Max. Marks: 70

Answer Any F our Questions All Questions carries equal marks .

*** 1 Define Object -Oriented Programming Paradigm. Discuss the features of OO paradigm in details and how C++ an OOP language implements the s ame.

2 a) Write a C++ p rogram to implement switch statement .

b) Classify the basic data types into various categories and explain it .

3 a) To find the Area of Circle, Square and Triangle, i mplement a function overloading concept by writing a C++ progra m b) Develop a program to calculate cube of a given variable using inline function and return the result by reference.

4 a) We have 5 students in a class and we have to input the name, rollno and mark of all the 5 students. Then create 5 different objects an d then input the name and marks of all those 5 students. Design a program to display the details of all the students using array of object .

b) List out the characteristics of friend function.

5 Define Constructor. Summarize the various types of constructo rs with an example.

6 a) Illustrate the various access modes and their role s in inheritance with example.

b) Contrast the function overloading and function overriding.

7 a) Define polymorphism. Differentiate runtime polymorphism and compile time polymorphism .

b) Demonstrate the use of new operator and delete operator with an example .

8 Outline the various ways of handling exceptions? Identify w hen do we use multi -catch handlers? Justify with an example.

********** R17