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Previous Question Papers
Academic year: 2022.0

- R15 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
- R17 I Year I Sem Supplementary, July-August 2021

Page 1 of 1 Code No: R18A0012 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.Tech I Semester Supplementary Examinations, June -2022

Applied Physics (ECE, CSE, IT ) Roll No Time: 3 hours Max. Mark s: 70 Answer Any Five Questions

All Questions carries equal marks.

*** 1 Obtain expressions for energy levels and wave functions of a particle enclosed in one dimensional box of infinite length [14M ] 2 Describe G.P Thomson experiment to prove the wave na ture of electrons [14M ] 3 a. Discuss qualitatively how band theory of solids leads to the classification of

solids into conductors, semiconductors and insulators b. Derive an expression for Density of states.

[4M] [10M ] 4 a) Wha t is Bloch theorem? Explain b) Write the conclusions given by Kronig -Penny Model

[7M] [7M] 5 State and explain Hall effect? Derive an expression for Hall coefficient [14M ] 6 a) Distinguish between Intrinsic and Extrinsic semiconductors

b) What are direct and indirect bandgap semiconductor s [7M] [7M] 7 Explain electronic polarizability in atoms and obtain an expression for electronic polarizabilty in terms of radius of the atoms

[14M ] 8 Define Acceptance angle and Numerical aperture of an optical fiber and derive an expression for Nume rical aperture [14M ] **********

R18 Page 1 of 2 Code No: R18A0261 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India)

I B.Tech I Semester Supplementary Examinations, June -2022 Basic Electrical and Electronics Engineering (ME & AE ) Roll No Time: 3 hours Max. Marks: 70

Answer Any Five Questions All Questions carries equal marks.

*** 1 (a) What is the difference between an ideal source and a practical source? Draw the relevant characteristics of the above sources.

(b)Explain the difference b etween active elements and passive elements with suitable examples.

[7M] [7M] 2 a) Explain Kirchhoff’s Laws.

b) Explain Ohm’s law. What are the limitations of Ohm’s law.

[7M] [7M] 3 a) Find current in the 15 Ω resistor using mesh method.

b) Explain Norton’s the orem with example . [7M] [7M] 4 a) Determine the resistance between points A and B in the network shown in Fig.

b) Explain Superposition theorem with example. [7M] [7M] 5 a) Explain the working principle of DC Generator?

b) Derive EMF equ ation of a DC generator. [7M] [7M] R18 Page 2 of 2 6 a) Derive the emf equation of a transformer.

b) Derive the torque equation of DC motor .

[7M] [7M] 7 a) Explain the operation of PN junctions diode with V -I characteristics .

b) Write the difference between half wave rectifier and full wave rectifier [10M] [4M] 8 a) How transistor acts as an amplifier b) Explain CE configuration of BJT [7M]

[7M] ********** Page 1 of 1 Code No: R18A0013 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY

(Autonomous Institution – UGC, Govt. of India) I B.Tech I Semester Supplementary Examinations, June -2022 Engineering Chemistry (ME) Roll No

Time: 3 hours Max. Marks: 7 0 Answer Any Five Questions All Questions carries equal marks.

*** 1 a) Explain the construction and working of a Lead acid battery b) List out various potentiometric titrations .

[7M] [7M] 2 a) Differentiate sacrificial anodic and impressed current cath odic methods in controlling the corrosion of metals.

b) Galvanised sheets are not advised in making utensils. Give reason.

[7M] [7M] 3 a) Distinguish atomic and molecular orbitals .

b) Write postulates of Molecular Orbital Theory.

[7M] [7M] 4 a) Explai n the crystal field splitting of d -orbitals in Tetrahedral Complex.

b) Applying molecular orbital theory construct the energy level diagram of O2 molecule.

[7M] [7M] 5 a) Distinguish temporary and permanent hardness.

b) Explain various steps in the trea tment of Potable water.

[7M] [7M] 6 Explain desalination of water by reverse osmosis.

[14M ] 7 a) Explain the mechanism in the oxidation of alcohols.

b) Compare SN1 and SN2 reactions.

[7M] [7M] 8 a) List out the characteristics of a good fuel.

b) Comp are solid, liquid and gaseous fuels.

[7M] [7M] ********** R18 Page 1 of 2

Code No: R18A0301 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.Tech I Semester Supplementary Examinations, June -2022 Engineering Graphics

(ECE, CSE & IT ) Roll No Time: 3 hours Max. Marks: 70 Answer Any Five Questions All Questions carries equal marks.

1 Draw a cycloid of a circle of diameter 50mm for one revolution. Also, draw a tangent and normal to that curve at a point 35mm above the base line. [14M] 2 Construct a plain scale of 1:40 to read meters and decimeters and long enough to measure up to 6 meters. Mark a distance 4.7 m on it. [14M] 3 A point P is 15 mm above the H.P. and 20 mm in front of the V.P. Another point

Q is 25 mm behind the V.P. and 40 mm below the H.P. Draw p rojections of P and Q keeping the distance between their projectors equal to 90 mm. Draw straight lines joining (i) their top views and (ii) their front views. [14M] 4 An 80 mm long line PQ has the end Q lying both in the H.P. and V.P. The line is

inclined at 300 to H.P. and 450 to the V.P. Draw its Projections. [14M] 5 A pentagonal plane of side 30 mm has an edge in the V.P. The surface of the plane is inclined at 450 to the V.P. and the edge on which it rests is inclined at 300 to the H.P. Draw its pr ojections. [14M] 6 A semi circular plane of diameter 70 mm has its straight edge on the V.P. and

inclined at 300 to the H.P. Draw the projections of the plane when its surface is inclined at 450 to the V.P. [14M] 7 Draw the isometric view of a cylinder o f base diameter 50mm and axis 60mm.

The axis of the cylinder is perpendicular to the (a) H.P. (b) V.P. [14M] 9888 The front view and top views of casting are shown in Fig. Draw its isometric views. All dimensions are in mm [14M] R18 Page 2 of 2 Page 1 of 2

Code No: R18A0021 MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.Tech I Semester Supplementary Examinations, June -2022 Mathematics -I

(EEE, ME, ECE, CSE, IT & AE ) Roll No Time: 3 hours Max. Marks: 70 Answer Any Five Questions All Questions carries equal marks.

**** 1 (a) Define rank of a matrix , reduce the matrix A into Echelon form and hence find its rank 2 4 3 1 01 2 1 4 2

0 1 1 3 14 7 4 4 5A−−− − −=−−− (b) Show that th e equations

1 ,2 3 2 2,1 2 3,3 2 −=+−=+−−=+−=−+ zyx z y x z yx zy x are Consistent and hence obtain the solution [7M] [7M] 2 Verify Cayley Hamilton theorem of the matrix

1 2 32 1 43 1 1A=−−

[14M] 3 (a) If , , ,yz zx xyu v wx y z= = = show that ( , , )4.( , , )u v wx y z=

(b) Find the maxima and minimum values of 333. x y axy+− [7M] [7M] 4

Expand the function ( , ) log(1 )xf x y e y=+ in terms of x and y up to the terms of 3rd degree using Taylors theorem.

[14M ] 5 (a) Solve 2 3 3( ) 0. x y dx x y dy− + = (b) A bacterial culture, growing exponentially increases from 200 to 500 grms in the period from 6 am to 9 am. How many grams will be present at noon.

[7M] [7M] 6 Solve ()22tan , D a y ax+= by the method of variation of parameters.

[14M ] R18 Page 2 of 2 7 (a) Solve px2+qy2=z2 (b) Solve x(y -z)p+y(z -x)q=z(x -y) [7M]

[7M] 8 (a) Find the Laplace transform of 322 sin 2 cos3 sinh 3 2cosh 4 9tte e t t t t−− + + + − +(b) Find the Laplace Transform of tt tcos3sin .

[7M] [7M] ********** Page 1 of 1 Code No: R18A0501

MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) I B.Tech I Semester Supplementary Examinations, June -2022 Programming for Problem Solving (EEE, ME, ECE, CSE, IT & AE )

Roll No Time: 3 hours Max. Marks: 70 Answer Any Five Questions All Questions carries equal marks.

*** 1 What are precedence of operators? Explain with example ?

[14M ] 2 Write a C program to print Pascal number triangle for a given number ?

[14M ] 3 Expla in the significance of ‘break’ and ‘continue’ statement with a sample program ?

[14M ] 4 Explain static and extern storage classes with a sample program ?

[14M ] 5 What are the memory allocation functions? Explain them clearly ?

[14M ] 6 What is a function ? Explain different types of calling functions with examples.

[14M ] 7 Compare and contrast array of pointer and pointer to arrays with examples .

[14M ] 8 How we can define structure with in a structure? Explain with a sample program.

[14M ] ********** R18