MALLA REDDY COLLEGE OF ENGINEERING &TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
(Affiliated to JNTU, Hyderabad, Approved by AICTE - Accredited by NBA & NAAC – ‘A’ Grade, ISO 9001:2008 Certified)
Maisammaguda, Dhulapally, Secunderabad – 500100.
DEPARTMENT OF
ELECTRONICS & COMMUNICATION ENGINEERING
III B. TECH I SEMESTER
QUESTION BANK (2020 – 21)
R18-REGULATION
Code No: R18A0422
MODEL PAPER –I
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
III B.Tech I Semester Examinations
CELLULAR & MOBILE COMMUNICATIONS
(Electronics & Communication Engineering)
Time: 3 hours Max. Marks: 70
Note: This question paper consists of 5 SECTIONS . Answer FIVE Questions, choosing ONE
Question from each SECTION and each Question carries 14 Marks.
SECTION-I
1. a) What are the limitations of conventional mobile telephone system? Describe the various
Generations of wireless mobile communication?
b) What are the Main advantages and disadvantages of various cellular structures?
(OR)
2. a) What is the need of Frequency reuse? Prove that for a hexagonal geometry the co-
channel reuse ration is (3N)
1/2
where N=i
2
+ij+j
2
.
b) Determine the number of cells in cluster for the following values of the shift Parameters I and
j in a regular hexagon geometry pattern: (i) i=2 and j=4 (ii) i=3 and j=3
SECTION-II
3. a) What are the different interferences in cellular systems? Explain each with diagrams.
b) Explain how a diversity receiver reduces the interference.
(OR)
4. Discuss in detail
a) The propagation in near distance
b) Long distance propagation
SECTION-III
5. a) Explain the effects of human made structures for mobile propagation in open area .
b) What is mean by foliage? Explain Foliage loss.
(OR)
6. a) Explain the sum-and-difference patterns and their synthesis in detail.
b) Explain the design aspects and merits of an Omni-directional antenna in cell site.
SECTION-IV
7. Describe the concept of frequency management concern to numbering the channels and
Grouping into the subset
(OR)
8. Explain the channel assignment to the cell sites based on the adjacent channels.
SECTION-V
9. a) What are the various methods of delaying handoff? Explain briefly.
b) What is meant by dropped call? Explain the factors that influenced dropped call rate.
(OR)
10. What are the various handoff strategies based on algorithms of handoff? Explain in detail.
Code No: R18A0422
MODEL PAPER –II
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
III B.Tech I Semester Examinations
CELLULAR & MOBILE COMMUNICATIONS
(Electronics & Communication Engineering)
Max. Marks: 70
Note: This question paper consists of 5 SECTIONS . Answer FIVE Questions, Choosing ONE
Question from each SECTION and each Question carries 14 Marks.
SECTION-I
1. Describe the principle of Operation of cellular mobile system and explain the cellular Concept
with neat diagram.
(OR)
2. a) What are the various components in a cellular system? Explain.
b) List the various techniques used to expand the capacity of a cellular system
SECTION-II
3. a) How the interference is different from noise in cellular system? explain
b) What are the different types of interference for a cellular system in detail?
(OR)
4. a) Explain the types of non-co-channel interferences in cellular system.
b) Distinguish Co-channel interference and Non Co-channel interference.
SECTION-III
5. a) Describe the form of a point to point model and explain its types.
b) Explain the mobile signal propagation over water and flat area
(OR)
6. a) What is known as directional antennas? Explain directional antennas for interference in
detail.
b) Explain space diversity antennas in detail.
SECTION-IV
7. What is the importance of frequency management chart? Give the structure of the channels in
800 MHz system with frequency ranges?
(OR)
8. Explain clearly different channel assignments and its importance in mobile communications or
in brief frequency management in mobile communications?
SECTION-V
9. a)What is meant by handoff ? Describe the classification of handoff process ?
b) What is meant by handoff initiation? Explain different methods of Handoff initiation with
suitable diagrams.
(OR)
10. a) Explain about the handoff and power control?
b) Explain about inter MSC Handoff?
Code No: R18A0422
MODEL PAPER –III
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
III B.Tech I Semester Examinations
CELLULAR & MOBILE COMMUNICATIONS
(Electronics & Communication Engineering)
Max. Marks: 70
Note: This question paper consists of 5 SECTIONS . Answer FIVE Questions, Choosing ONE
Question from each SECTION and each Question carries 14 Marks.
SECTION-I
1. a) Briefly describe the concept of mobile radio environment.
b) What are the advantages of digital cellular system over analog cellular system?
(OR)
2. a) Derive the desired C/I for a Normal case in an Omni directional antenna system.
b) Explain about mobile fading characteristics.
SECTION-II
3. a) What are the different types of Non co-channel interference in a cellular system? Explain
b) Explain the effects of antenna design Parameters for the interference in a cellular system
(OR)
4. a) Explain the co-channel interference reduction factor and derive the general formula for C/I.
b) What are the various techniques to measure CCI? Explain in detail.
SECTION-III
5. a) Explain the mobile radio propagation over water and flat open area and write the general
expression.
b) Describe the effect of antenna height in near and long distance mobile propagation.
(OR)
6. Explain
a) Umbrella pattern antenna.
b) Space diversity antennas.
SECTION-IV
7. Describe the grouping of the voice, set-up and paging channels.
(OR)
8. Explain in detail the fixed channel and non fixed channel assignment?
SECTION-V
9. a) Explain different handoff strategies and its importance in different situations.
b) How to improve call drop rate.
(OR)
10. Write a short notes on
a) Forced Handoff
b) Inter System Handoff
Code No: R18A0422
MODEL PAPER –IV
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
III B.Tech I Semester Examinations
CELLULAR & MOBILE COMMUNICATIONS
(Electronics & Communication Engineering)
Max. Marks: 70
Note: This question paper consists of 5 SECTIONS . Answer FIVE Questions, Choosing ONE
Question from each SECTION and each Question carries 14 Marks.
SECTION-I
1. a) What is the uniqueness of mobile radio environment and Explain.
b) Explain the significance of fading of fading in mobile environment.
(OR)
2. a) Explain Cell splitting and Concept of frequency channels.
b) Explain co-channel interference with first tier and second tier example.
SECTION-II
3. a) Derive the expression for carrier to interference Ratio in a cellular system for a normal case
and worst case scenario with an Omni directional antenna.
b) Determine the minimum cluster size for a cellular system designed with an acceptable value
of C/I=18dB. Assume the path Loss exponent as 4 and co channel interference at the mobile unit
from 6 equidistant cells in the first tier.
(OR)
4. a) Explain the causes for near to far end interference.
b) Mention different systems to reduce the interference.
SECTION-III
5. a) Explain the effect of antenna pattern on the interference at the base station and mobile unit.
b) Explain in detail about near and long distance mobile propagation.
(OR)
6. a)Describe the various steps involved in finding antenna height gain in mobile environment.
b) Explain umbrella pattern antenna and Omni-directional antennas in detail.
SECTION-IV
7. Write short notes on
a) Channel sharing and barrowing
b) Fixed channel assignment
(OR)
8. What type of messages is received to the setup channels when mobile unit monitors strongest
signal strength?
SECTION-V
9. a)Write a notes on power difference handoffs
b) Explain a two level handoff scheme with suitable example
(OR)
10. a) What is meant by call drop? Explain and suggest methods to reduce call drop rate.
b) Write short notes on different types of hand off mechanisms.
Code No: R18A0422
MODEL PAPER –V
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
III B.Tech I Semester Examinations
CELLULAR & MOBILE COMMUNICATIONS
(Electronics & Communication Engineering)
Max. Marks: 70
Note: This question paper consists of 5 SECTIONS . Answer FIVE Questions, Choosing ONE
Question from each SECTION and each Question carries 14 Marks.
SECTION-I
1. a) What is the uniqueness of mobile radio environment? Explain.
b) Explain the call initialization, call progress and call termination process.
(OR)
2. a) Explain the normal case of carrier to interference ratio with Omni-directional antenna.
b) What is cell-splitting? Explain its types in detail.
SECTION-II
3. a) discuss in details the various techniques to measure co channel interference.
b) prove that the real time co channel interference measurement is difficult to achieve.
(OR)
4. a) Explain non-co-channel interference effects on coverage and interferences.
b) Explain the effects of coverage and interference by power decrease and decrease antenna
height.
SECTION-III
5. a) What are the different propagation models available for mobile communication, Explain?
b) Explain the phase difference between direct and reflected paths in detail.
(OR)
6. Explain about minimum separation of cell-site receiving antennas.
SECTION-IV
7. Elaborate dynamic channel assignment and compare its advantages and disadvantages with the
fixed channel assignment
(OR)
8. What is known as dynamic channel assignment average blocking and handoff blocking?
Explain.
SECTION-V
9.a) Explain MAHO and soft handoff techniques.
b) Explain “Dropped call rate” in detail.
(OR)
10. Write a short note on
a) Delayed handoff
b) Inter systems Handoff
c) Power difference Handoff
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
B.Tech III Year I Semester Examinations
DIGTIAL COMMUNICATIONS
(Electronics and Communication Engineering)
Model Question Paper-1
Time: 3 hours Max. Marks: 70
Note: Paper consists of 5 Sections. Answer any one full question from each Section. Each
question carries 14 marks and may have a, b, c, as sub Questions
SECTION-I
1.
(a) Explain DPCM transmitter & receiver with a neat block diagram & necessary
equations.
(b)
A voice frequency signal band limited to 3 KHz is transmitted with the use of DM
system. The pulse repetition frequency is 30,000 pulses/sec and the step size is 40 mV.
Determine the permissible speech signal amplitude to avoid slope overload distortion.
(OR)
2.
(a) Derive an expression for Signal to Quantization noise in PCM system.
(b)
Explain the concept of Companding.
SECTION-II
3.
(a) Explain the operation of DPSK transmitter and receiver.
(b)
The bit stream 1011100011 is to be transmitted using DPSK. Determine the encoded
sequence and transmitted phase sequence.
(OR)
4.
Explain coherent detection of FSK and also derive the expression for probability of
error.
SECTION-III
5.
(a) Explain the bandwidth and signal to noise tradeoff.
(b)
Define conditional entropy. Explain how it is related to mutual information.
(OR)
6.
(a) Given six messages x
1
,x
2
,x
3
,x
4
,x
5
,x
6
with probabilities, P(x1) = 1/3, P(x2)=1/4 ,
P(x3)=
1/8, P(x4)=1/8, P(x5)= 1/12 P(x6) = 1/12. Find the Shannon-Fano code.
Evaluate the coding efficiency.
(b)
Repeat the problem using Huffman coding & evaluate the code efficiency.
SECTION-IV
7.
a. What are linear codes? Describe the various methods of error control with
their advantages and disadvantages.
b. An error control code has the following parity check matrix
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(i) Determine the generator matrix ‘G’
(ii) Decode the received code word 110110. Comment on error detection
capability of this code.
(OR)
8.
a. Describe the encoding, syndrome & decoding of cyclic codes in detail with neat
sketches.
b. List out the advantages & disadvantages of cyclic codes.
SECTION-V
9.
The encoder for a convolution code is as shown below.
a)
What are the connection vectors?
b)
What are the polynomials?
c)
What is the impulse response?
d)
Draw the state diagram
e)
Write the output for an input of {1 1 0 1 0 0 1 0 0}
f)
Draw the Trellis diagram up to depth ‘4’
(OR)
10.
A convolutional encoder is described by the polynomials
g
1
(x) = 1+x+x
2
g
2
(x) =x+x
2
For this encoder
a.
Find the connection vectors
b.
Draw the state diagram
c.
Find the output for message input 1010
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
B.Tech III Year I Semester Examinations
DIGTIAL COMMUNICATIONS
(Electronics and Communication Engineering)
Model Question Paper-2
Time: 3 hours Max. Marks: 70
Note: Paper consists of 5 Sections. Answer any one full question from each Section. Each question
carries 14 marks and may have a, b, c, as sub Questions
SECTION-I
1.
a. Explain DM transmitter & receiver.
b. Explain the drawbacks of Delta Modulation.
(OR)
2.
a. Discuss the advantages and disadvantages of digital communication system.
b. State and prove sampling theorem in time domain.
SECTION-II
3.
a. Draw the block diagram of QPSK system (modulator & detector) and explain its working.
b. Derive the expression for the probability of error of QPSK.
(OR)
4.
a. Explain non- coherent ASK detector in detail.
b. Explain detection of FSK using PLL
SECTION-III
5.
Define the concept of information. List its properties and prove them
(OR)
6.
a. State and prove properties of mutual information and entropy.
b. Prove that H(X, Y) = H(X) + H(Y/X) = H(Y) + H(X/Y).
SECTION-IV
7.
a. State and explain the properties of cyclic codes
b. The generator polynomial of a (7, 4) cyclic code is x
3
+x+1. Construct the generator
matrix for a systematic cyclic code and find the code word for the message (1101) using the
generated matrix.
(OR)
8.
a. Explain the principle and operation of encoder for Hamming code.
b. A generator matrix for generating linear codes is as follows
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i)
What is the message length for which this code generated may be used, the
code word length, code rate and redundancy rate
ii)
Find the code words for the possible messages
SECTION-V
9.
a. For the convolutional encoder shown below, draw the state diagram and the trellis
diagram
b. What is a convolutional code? Compare Trellis & Code Tree.
(OR)
10.
Explain the Viterbi decoding of convolutional code.
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
B.Tech III Year I Semester Examinations
DIGTIAL COMMUNICATIONS
(Electronics and Communication Engineering)
Model Question Paper-3
Time: 3 hours Max. Marks: 70
Note: Paper consists of 5 Sections. Answer any one full question from each Section. Each
question carries 14 marks and may have a, b, c, as sub Questions
SECTION-I
1.
a. A TV signal with a bandwidth of 4.2 MHz is transmitted using binary PCM. The
number of representation level is 512. Calculate:
i)
Code word length
ii)
Final bit rate
iii)
Transmission bandwidth.
b. Describe delta modulation with a neat sketch.
(OR)
2.
a) Derive an expression for signal to quantization noise ratio of a PCM encoder using
uniform quantizer when the input signal is uniformly distributed.
b) What is companding? Explain the compression laws A-law and µ- law.
SECTION-II
3.
Explain BPSK modulation and coherent reception of BPSK signal
(OR)
4.
a. What is a matched filter?
b. Derive the Probability of error of ASK.
SECTION-III
5.
a. Explain why information measure is logarithmic & inversely proportional to the
probability. What are the units of information measure?
b. State the significance of H(Y/X) and H(X/Y).
(OR)
6.
A source emits different symbols a,b,c,d,e with respective probabilities 0.1,
0.2,0.1,0.1,0.5. Obtain the code words using Huffman coding and also calculate
entropy.
SECTION-IV
7.
Consider the (15,9) cyclic code generated by G(p)=p
6
+p
5
+p
4
+p
3
+1, draw the encoder
& Syndrome calculator.
(OR)
8.
(a) Briefly discuss about a linear block code error control technique.
(b) Briefly discuss about parity check bit error control technique.
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SECTION-V
9.
For the convolutional encoder shown in the figure, determine the following:
a.
Dimension of the code
b.
Constraint length
c.
Generating sequences (impulse responses)
d.
Output sequence for the message sequence of m=(1 0 0 1 1)
(OR)
10.
Explain generation of convolutional code using an example. Also explain the term
constraint length and its significance in convolutional code.
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
B.Tech III Year I Semester Examinations
DIGTIAL COMMUNICATIONS
(Electronics and Communication Engineering)
Model Question Paper-4
Time: 3 hours Max. Marks: 70
Note: Paper consists of 5 Sections. Answer any one full question from each Section. Each
question carries 14 marks and may have a, b, c, as sub Questions
SECTION-I
1.
a. Explain the elements of digital communications system with the help of a neat
block diagram.
b. Consider a DM system used to transmit a voice signal, which is uniformly
sampled at the rate of 64KHz. Assume the following specifications voice signal
bandwidth=3.1 KHz, Maximum signal amplitude=10 volts, to avoid slope overload
distortion, what is the minimum permissible value of the step size ∆ used in the
system?
(OR)
2.
(a) Explain PCM generation and Receiver.
(b) In a binary PCM system, the output signal to quantizing noise ratio is to held to
be 40dB. Determine the number of required levels.
SECTION-II
3.
(a). Explain the FSK Spectrum with equations and Calculate BW of FSK.
(b) Determine the Probability of error of FSK.
(OR)
4.
(a) Derive the expression of probability of error of matched filter.
(b) Explain the realization of optimum filter using correlator.
SECTION-III
5.
(a) Show that if there are M numbers of equally likely messages then entropy of the
source is log
2
M.
(b) Define Mutual Information. List its properties.
(OR)
6.
A DMS has a alphabet of seven symbols with probability for its output as described
here
Symbol
S0
S1
S2
S3
S4
S5
Probability
0.25
0.0625
0.0625
0.125
0.375
0.125
Compute the Huffman code for this source and explain why the computed source code
has an efficiency of 100%. Calculate H.
SECTION-IV
7.
(a) Explain the matrix description of Linear Block codes.
R18
(b) Write short notes on Hamming codes. Explain about the error detection &
correction capabilities.
(OR)
8.
(a) Define cyclic codes. List the properties of cyclic codes.
(b) Design a Syndrome Calculator for a (7,4) cyclic Hamming code generated by the
polynomial G(p)=p
3
+p+1. Calculate the syndrome for Y= (1001101).
SECTION-V
9.
For the convolutional encoder shown below, draw the state diagram and the trellis
diagram and calculate Constraint Length, Dimension of the code, Generating sequence.
(OR)
10.
Draw the state diagram, tree diagram and trellis diagram for K=3, rate=1/3 code
generated by g
1
(x)=1+x
2
(or ){1 0 1}, g
2
(x)=1+x (or ){1 1 0}, g
3
(x)=1+x+x
2
(or ){1 1 1}.
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
B.Tech III Year I Semester Examinations
DIGTIAL COMMUNICATIONS
(Electronics and Communication Engineering)
Model Question Paper-5
Time: 3 hours Max. Marks: 70
Note: Paper consists of 5 Sections. Answer any one full question from each Section. Each
question carries 14 marks and may have a, b, c, as sub Questions
SECTION-I
1.
(a) Explain about the noise in PCM systems
(b) Write the comparison between PCM, DPCM, DM & ADM systems.
(OR)
2.
(a) Explain the process of Sampling & Quantization in digital communication systems.
(b) Explain the need for non-uniform quantization in digital communication systems.
(c) What is the need for ADM? Explain ADM Transmitter and Receiver.
SECTION-II
3.
(a) Draw the block diagram of a baseband signal receiver and explain.
(b) Obtain the optimum filter transfer function.
(OR)
4.
Derive the probability of error of BPSK
SECTION-III
5.
(a) State and prove Shannon-Hartley theorem.
(b) Calculate the channel capacity with bandwidth 1MHz and Signal to noise ratio of
3000.
(OR)
6.
Explain the procedure for Huffman coding with an example.
SECTION-IV
7.
a. Describe the algebraic structure of cyclic codes.
b. Explain how to encode cyclic codes.
(OR)
8.
The parity check bits of a (8,4 ) block code are given by
c1=m1+m2+m4
c2=m1+m2+m3
c3=m1+m3+m4
c4=m2+m3+m4
Here m1, m2, m3 and m4 are the message bits
(a)
Find the generator matrix and parity check matrix for this code.
(b)
Find minimum weight of this code
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(c)
Find error detecting capabilities of this code.
SECTION-V
9.
Find the convolutional code for the message sequence m= (1 0 0 1 1) using the
following encoder using Transform domain approach.
(OR)
10.
For convolutional encoder with constraint length of 3and rate ½ shown below, draw
the state diagram, Trellis diagram and by using Viterbi algorithm decode sequence 01
00 01 00 00
Code No: XXXXXXX
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
QUESTION PAPER
INTRODUCTION TO JAVA PROGRAMMING
Roll No
Time: 3 hours Max. Marks: 70
Note:
Question paper Consists of 5 SECTIONS (One SECTION for each UNIT).
Answer FIVE Questions, Choosing ONE Question from each SECTION and each
Question carries 14 marks.
_____________________________________________________________________
SECTION-I
1). Explain briefly about Object Oriented Programming concepts? [14M]
(OR)
2. a) Explain briefly about type conversion and type casting with example program? [7M]
b) Write a java program for finding the factorial of a given number using recursion? [7M]
SECTION-II
3. a)Explain different types of inheritances with example program? [7M]
b)What is a package? Explain User defined package with program? [7M]
(OR)
4. a)Explain method overriding with example program? [7M]
b) Explain super keyword with program? [7M]
SECTION-III
5. a) What is an Exception? Explain different types of Exceptions? [7M]
b) Explain about try and catch with example program? [7M]
R18
(OR)
6 a) Explain how to create a Thread with example program? [7M]
b) Explain about Thread Synchronization with program? [7M]
SECTION- IV
7). What is an Applet? Explain Applet life Cycle with neat diagram [14M]
(OR)
9. a)Explain FileInputStream and FileOutputStream with program? [7M]
b) Write a program for Handling Mouse Events? [7M]
SECTION- V
10.a) Explain about AWT class hierarchy? [7M]
b) Explain about AWT and Swing? [7M]
(OR )
11) Explain different types of Layouts with example program? [14M]
***********
Code No: XXXXXXX
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
QUESTION PAPER
INTRODUCTION TO JAVA PROGRAMMING
Roll No
Time: 3 hours Max. Marks: 70
Note:
Question paper Consists of 5 SECTIONS (One SECTION for each UNIT).
Answer FIVE Questions, Choosing ONE Question from each SECTION and each
Question carries 14 marks.
_____________________________________________________________________
SECTION-I
1) Explain Procedure oriented programming and Object Oriented programming? [14M]
(OR)
2. a) Explain different loop control statements with example program? [7M]
b) Explain parameter passing Mechanism with example program? [7M]
SECTION-II
3. a) Explain Method overriding and Abstract class with example program? [7M]
b) What is an Interface? Explain how to extend one interface with another [7M]
(OR)
4. a)Difference between Interface and Abstract class? [7M]
b) Explain final keyword with method and class? [7M]
SECTION-III
5. a) Explain about checked and unchecked Exceptions in java? [7M]
b) Explain finally block with example program? [7M]
(OR)
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6 a) What is a Thread? Explain Thread Life cycle with neat diagram? [7M]
b) Explain Inter-Thread Communication with Producer and Consumer problem? [7M]
SECTION- IV
7) Explain differences between Applet and Application? [14M]
(OR)
9. a) Explain Event classes and Event Listeners with example? [7M]
b) Write a program for handling Key Events? [7M]
SECTION- V
10.a) Explain about Graphic class methods? [7M]
b) Explain about Border, Grid, and Flow Layouts in java? [7M]
(OR )
11) Explain about AWT controls with program? [14M]
***********
Code No: XXXXXXX
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
QUESTION PAPER
INTRODUCTION TO JAVA PROGRAMMING
Roll No
Time: 3 hours Max. Marks: 70
Note:
Question paper Consists of 5 SECTIONS (One SECTION for each UNIT).
Answer FIVE Questions, Choosing ONE Question from each SECTION and each
Question carries 14 marks.
_____________________________________________________________________
SECTION-I
1). Explain Constructor Overloading and Method Overloading with example program? [14M]
(OR)
2. a) Explain different Operators in Java with examples [7M]
b) Explain about Scanner and StringTokenizer class? [7M]
SECTION-II
3. a)Explain Dynamic binding with example program? [7M]
b)What is an interface? Explain how to extend an interface with program? [7M]
(OR)
4. a)Explain different Access Specifiers in java? [7M]
b) Explain about this keyword and built in packages? [7M]
SECTION-III
5. a) Explain throw and throws keyword with example program? [7M]
b)Explain nested try block with example program? [7M]
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(OR)
6 a) Explain Thread Synchronization with example program? [7M]
b) Explain about Creating a Thread with program ? [7M]
SECTION- IV
7). Explain FileInputStream with program? [14M]
(OR)
9. a)Write a program for handling Mouse Events? [7M]
b) Explain Adapter class with example program? [7M]
SECTION- V
10.a) Differences between AWT and Swings? [7M]
b) Difference between Applets and Applications? [7M]
(OR )
11) Explain about Layout Managers with program [14M]
***********
Code No: XXXXXXX
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
QUESTION PAPER
INTRODUCTION TO JAVA PROGRAMMING
Roll No
Time: 3 hours Max. Marks: 70
Note:
Question paper Consists of 5 SECTIONS (One SECTION for each UNIT).
Answer FIVE Questions, Choosing ONE Question from each SECTION and each
Question carries 14 marks.
_____________________________________________________________________
SECTION-I
1). Explain about Java Buzz words or Features and History of java [14M]
(OR)
2. a) Explain about Garbage Collector in java ? [7M]
b) Explain this keyword with example program? [7M]
SECTION-II
3. a)Explain different types of inheritances in java? [7M]
b)Explain difference between Abstract class and Interface? [7M]
(OR)
4. a)Explain about super keyword with example program? [7M]
b) Explain how multiple inheritance is supported in java? Justify [7M]
SECTION-III
5. a) What is Exception? Explain Built in Exceptions in java [7M]
b)What is Built in Exceptions in java [7M]
R18
(OR)
6 a) Explain about Thread Synchronization with program? [7M]
b) Explain Inter Thread Communication with program? [7M]
SECTION- IV
7). Explain FileOutputStream with program? [14M]
(OR)
9. a) Explain different types of applets in java [7M]
b) Explain how to pass parameters to an applet with program? [7M]
SECTION- V
10.a) Explain about Delegation Event Model? [7M]
b) Difference between AWT and Swing [7M]
(OR )
11) Explain AWT components [14M]
i) Label ii) Button iii) Text Field iv) Checkbox
***********
R18
Code No: R18A0409
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
III B.Tech I Semester Examinations
Linear and Digital Integrated Circuits
(ECE)
MODEL PAPER 1
Roll No
Time: 3 hours Max. Marks: 70
Note: This question paper Consists of 5 SECTIONS (One SECTION for each UNIT). Answer FIVE
Questions, Choosing ONE Question from each SECTION and each Question carries 14marks
******
SECTION – I
1.a) Explain the operation of non-inverting Op-amp and derive the expression for
output voltage? [10M]
b)If the differential voltage gain and common mode voltage gain of a differential
amplifier are 48dB and 2 dB respectively then calculate the CMRR. [4M]
(OR)
2.a)Explain the Working of Instrumentation Amplifier with suitable diagram. [7M]
b)Calculate the hysteresis voltage for the schmitt trigger from the given
specification:
R
2
=56kΩ , R
1
= 100Ω ,V
ref
= 0v & V
sat
= ±14v.
[7M]
SECTION-II
3.a) Draw the circuit and explain the operation of 1
st
order LPF Butterworth filter. [7M]
b) Design a wide band reject filter having f
H
= 400 Hz and f
L
= 2KHz with a
pass band gain of 2. [7M]
(OR)
4.a) Draw the block diagram of Astable multivibrator operations using IC 555 and derive
its time constant. [10M]
b)Write the applications of PLL 565. [4M]
SECTION-III
5.Explain the operation of successive approximation ADC and discuss its merits and de-merits.
[14M]
(OR)
6.Explain the R-2R ladder DAC and Inverted R-2R DAC with neat diagram. [14M]
SECTION-IV
7.Design binary to Gray code converter using gates. [14M]
(OR)
8.Design a 32 to 1 multiplexer using four 74×151 multiplexers and 74×139 decoder. [14M]
SECTION-V
9.Explain Decade Binary Counter. [14M]
(OR)
10.a) Explain the functional behavior of Static RAM cell? Show the internal structure
of 8X4 static RAM. [10M]
b) List out the applications of ROM. [4M]
R18
Code No: R18A0409
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
III B.Tech I Semester Examinations
Linear and Digital Integrated Circuits
(ECE)
MODEL PAPER II
Roll No
Time: 3 hours Max. Marks: 70
Note: This question paper Consists of 5 SECTIONS (One SECTION for each UNIT). Answer FIVE
Questions, Choosing ONE Question from each SECTION and each Question carries 14marks
******
SECTION – I
1.a) Using IC7812, design a circuit to generate +5V output [7M]
b) An adder-subtractor circuit designed using operational amplifier is shown below
Determine the output voltage for the given combinations of the inputs. Assume ideal
Op-amp [7M]
(OR)
2.a) Define the term CMRR, Input offset voltage, input offset current, input bias current
out offset voltage with reference to OPAMPs [7M]
b) Explain the operation of Schmitt trigger with the help of neat sketches [7M]
SECTION-II
3.a)
Design first order Butterworth low pass filter with high cutoff frequency f
H
= 1.59
KHz and pass
band gain of 10. Compute the gain at cutoff frequency. Plot the frequency response of the designed
filter [7M]
b) Compare and contrast, minimum any four features of active filters with
passive filters [7M]
(OR)
4.a) Explain mono-stable multi vibrator using IC 555 [7M]
b) If R
A
= 6.8 K, R
B
= 3.3 K, C = 0.1 µF in a 555 based astable multivibrator, calculate
the following
1)
t
high 2)
t
low 3) Free running frequency 4) Duty cycle [7M]
SECTION-III
5.a) Calculate the number of bits required to represent a full scale voltage of 10V with a
resolution of 5mV approximately [7M]
b) List out different types of A/D converters [7M]
(OR)
6. Explain the operation of weighted resistor DAC with neat circuit diagram [14M]
SECTION-IV
7. a) Explain 4 bit parallel adder [7M]
b) Explain 4-bit magnitude comparator [7M]
(OR)
8. Explain Decoders [14M]
SECTION-V
9. Explain 3 bit asynchronous counter with neat diagram [14M]
(OR)
10.a) Assume the propagation delay of each flip-flop is 12 ns. What is the total propagation
delay and the max clock frequency of a 3 bit asynchronous Binary counter [7M]
b) Explain the 2-bit synchronous binary counter [7M]
R18
Code No: R18A0409
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
III B.Tech I Semester Examinations
Linear and Digital Integrated Circuits
(ECE)
MODEL PAPER II1
Roll No
Time: 3 hours Max. Marks: 70
Note: This question paper Consists of 5 SECTIONS (One SECTION for each UNIT). Answer FIVE
Questions, Choosing ONE Question from each SECTION and each Question carries 14marks
******
SECTION – I
1.Explain the operation of inverting & non-inverting amplifier and derive the
expression for output voltage [14M]
(OR)
2.a) Explain the operation of Schmitt trigger [7M]
b) Explain the features of 723 regulators [7M]
SECTION-II
3. Draw and explain the frequency response of all filters based on frequency range [14M]
(OR)
4. Explain the functional diagram of IC 555 timer [14M]
SECTION-III
5. Explain the operation of ladder type DAC with neat diagram [14M]
(OR)
6. Explain the operation of counter type ADC [14M]
SECTION-IV
7. Explain Encoders [14M]
(OR)
8. Explain an 8-input Data Selector / Multiplexer [14M]
SECTION-V
9. Explain the synchronous BCD decade counter [14M]
(OR)
10.What is the shift register? Explain different kinds of shift Register [14M]
R18
Code No: R18A0409
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
III B.Tech I Semester Examinations
Linear and Digital Integrated Circuits
(ECE)
MODEL PAPER 1V
Roll No
Time: 3 hours Max. Marks: 70
Note: This question paper Consists of 5 SECTIONS (One SECTION for each UNIT). Answer FIVE
Questions, Choosing ONE Question from each SECTION and each Question carries 14marks
******
SECTION – I
1.Explain the operation of inverting and non-inverting Comparator [14M]
(OR)
2. Explain the working of an ideal & practical differentiator [14M]
SECTION-II
3. With a neat diagram explain about triangular wave generator and derive the frequency
of oscillation [14M]
(OR)
4. Explain the operation of Astable multivibrator using IC 555 timer and derive the
expression for frequency of oscillation [14M]
SECTION-III
5. a)For a Digital to Analog converter (DAC) with 0-10 Volts range, calculate the values of
LSB, MSB and output voltage for a digital input of 1010. Estimate the DAC’s
Quantization error [7M]
b) Design a R-2R network for DAC [7M]
(OR)
6. a)Explain Successive approximation ADC with conversion process [7M]
b) Explain dual slope ADC with neat diagram [7M]
SECTION-IV
7. a)Draw the 4 bit Parallel Adder (74LS283) and logic diagram. Explain its functioning
with one example. [7M]
b)What are decoders? Draw the pin diagram of and logic diagram of 4X16 Decoder
(74HC154). [7M]
(OR)
8.a) Design binary to Gray code converter. [10M]
b) Explain the operation of MUX [4M]
SECTION-V
9. Design a Modulo-10 counter using any flip flop. [14M]
(OR)
10. Design a conversion circuit to convert an S-R Flip Flop to J-K Flip Flop? [14M]
R18
Code No: R18A0409
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
III B.Tech I Semester Examinations
Linear and Digital Integrated Circuits
(ECE)
MODEL PAPER V
Roll No
Time: 3 hours Max. Marks: 70
Note: This question paper Consists of 5 SECTIONS (One SECTION for each UNIT). Answer FIVE
Questions, Choosing ONE Question from each SECTION and each Question carries 14marks
******
SECTION – I
1.Draw and explain the operation of an basic integrator and practical integrator
[14M]
(OR)
2. Explain the operation of inverting and non-inverting AC amplifier [14M]
SECTION-II
3.Explain how a symmetrical wave form can be constructed using 555 timer [14M]
(OR)
4.Explain the operation of PLL . [14M]
SECTION-III
5. Explain the operation of parallel comparator type ADC with the help of a neat diagram.
[14M]
(OR)
6. Explain the DAC and ADC specifications. [14M]
SECTION-IV
7. Explain Binary to Gray and Gray to Binary code conversion with one example each [14M]
(OR)
8. Explain the IC interfacing between TTL and CMOS [14M]
SECTION-V
9. Explain the operation of D filp-flop and T flip-flop with truth table [14M]
(OR)
10. Explain about ROM and RAM [14M]
MALLA REDDY COLLEGE OF ENGINEERING &TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
(Affiliated to JNTU, Hyderabad, Approved by AICTE - Accredited by NBA & NAAC – ‘A’ Grade, ISO 9001:2008 Certified)
Maisammaguda, Dhulapally, Secunderabad – 500100.
DEPARTMENT OF
ELECTRONICS & COMMUNICATION ENGINEERING
III B.TECH I SEMESTER
Computer Organization & Operating Systems
QUESTION BANK (2020 – 21)
R18A0572
Computer Organization & Operating Systems
R18
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
B.Tech III year – I Semester Examinations, Model Paper-I
Computer Organization & Operating Systems
(ECE)
Time: 3 hours
Answer one question from each section.
Max. Marks: 70
.
SECTION – I
1. a) Explain the following with neat sketches:
i) 4 – bit Binary adder ii) Binary Adder – Subtractor (7M)
b) Explain how registers are connected to common bus in the computer with a neat
diagram. (7M)
(OR)
2. a) Explain 4-bit binary incrementer with a neat diagram (7M)
b) Find 2’s complement of the following (7M)
(i) 10010 ii) 111000 iii) 0101010 iv) 111111
SECTION – II
3. Discuss the design of control unit. (14M)
(OR)
4. Discuss the memory mapping functions to place memory blocks in the cache. (14M)
SECTION – III
5. a)Why does DMA have priority over the CPU When both request a memory transfer?
(8M)
b) Discuss asynchronous data transfer. (6M)
(OR)
6. What is the difference between isolated IO and memory mapped I/O? State the
advantages and disadvantages of each. (7M)
7. What is a DMA controller? Explain. (7M)
SECTION – IV
8. a) Write about deadlock conditions and bankers algorithm in detail. (8M)
b) What is a page fault? Explain the steps involved in handling a page fault with a
neat sketch. (6M)
(OR)
9. a) How does deadlock avoidance differ from deadlock prevention? Write about
deadlock avoidance algorithm in detail. (8M)
b) What are the disadvantages of single contiguous memory allocation? Explain. (6M)
SECTION – V
10. a) Explain directory implementation. (7M)
b) Discuss contiguous allocation of disk space. (7M)
(OR)
11. a) Explain a typical file control block. (7M)
b) Illustrate and discuss linked allocation of disk space with a neat diagram. (7M)
*******
R18
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
B.Tech III year – I Semester Examinations, Model Paper-II
Computer Organization & Operating Systems
(ECE)
Time: 3 hours
Answer one question from each section
Max. Marks: 70
SECTION – I
1 .a) Perform the following: (4)
(i) (110.101) 2 = ( )10
(ii) (1.10101)2 = ( )10
(iii) (11010.1)2 = ( )10
(iv) 110.10 x 10.1
b) Write sixteen logic microoperations. (5)
c)Discuss about fixed point representation. (5)
(OR)
2 a) Explain shift microoperations. (5)
b) Distinguish between error detection and error correction. Explain with an example
how Hamming code is used for error detection. (5)
c) Draw the memory hierarchy in a computer system. (4)
SECTION – II
3.a) Mention the advantages and disadvantages of microprogrammed control hardwired
control. (10)
b) List the address sequencing capabilities required in a control memory. (4)
(OR)
4.a) Discuss asynchronous DRAMs and synchronous DRAMs. (10)
b) Distinguish between Logical and Physical address space. (4)
SECTION – III
5.a) How the data transfer to and from peripherals is done? Discuss with neat diagrams and
examples. (10)
b) Discuss source initiated transfer using handshaking. (4)
(OR)
6.What is a DMA controller? Explain. (14)
SECTION – IV
7.a) What is a deadlock? How deadlocks are detected? (5)
b)What is demand paging? (3)
b) What is a Virtual Memory? Discuss the benefits of virtual memory technique.(6)
(OR)
8.a) Explain the Resource Allocation Graph algorithm for deadlock avoidance. (8)
b) What is the cause of Thrashing? How does the system detect Thrashing? What can the
system do to eliminate this problem? (6)
SECTION – V
12. a) Explain the layered file system. (5)
b) What are the various attributes that are associated with an opened file? (3)
c) Discuss schematic view of a file system. (6)
(OR)
11.a) Explain the various methods for free-space management. (5)
b) Discuss virtual file system. (2)
b) Illustrate and discuss indexed allocation of disk space with a neat diagram. (5)
********
R18
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
B.Tech III year – I Semester Examinations, Model Paper-III
Computer Organization & Operating Systems
(ECE)
Time: 3 hours
Answer one question from each section. Max. Marks: 70
.
SECTION – I
1. a) What are the functional units of a computer? Explain the Bus Structures in detail?
8M
b) Describe about shift micro operations.
6M
OR
2. a) Describe about stack organization.
7M
b) List and explain different performance measures used to represent a computer system
Performance.
7M
SECTION – II
3. a) Explain the functioning of a micro-programmed control unit with a neat diagram? 7M
b) Write a short note on RAM memory.
7M
OR
4. Hardwired control unit is faster than micro-programmed control unit. Justify this
statement.
14M
SECTION – III
5. Explain various registers in DMA interface with their purpose
14M
OR
6. Write a short note on the following
14M
a) USB
b) IEE1394 c) Input Output devices
d) RS232
SECTION – IV
7. a) Explain the difference between internal and external
fragmentation. 7M
b) Discuss Characteristics of deadlock
7M
OR
8. a) What is paging explain any one of the paging technique with suitable example?
8M
b) Write a short note on structure of operating system and system calls
7M
SECTION – V
9. Explain the following terms with neat diagrams and examples:
a) Two level directory structure.
7M
b) DAG structure.
7M
OR
10. Explain the concept of free space management? 14M
******
R18
MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY
(Autonomous Institution – UGC, Govt. of India)
B.Tech III year – I Semester Examinations, Model Paper-IV
Computer Organization & Operating Systems
(ECE)
Time: 3 hours
Answer one question from each section. Max. Marks: 70
.
SECTION – I
1. a) a) Illustrate the basic Operational concepts of a computer with a neat diagram?
7M
b) Describe about Arithmetic Logic Shift Unit.
7M
OR
2. a) Represent 1259.125 10 in single precession and double precession formats?
7M
b) List and explain different addressing modes?
7M
SECTION – II
3. a) Give the micro instruction format? Explain
7M
b) Discuss briefly about virtual memory
7M
OR
4. a). Draw and explain hardwired control unit?
7M
b) Compare and contrast direct and associative techniques
7M
SECTION – III
5. What is interrupt? What are the types of interrupts explain the purpose of interrupt handler
15M
OR
6. Write a short note on
(4+4+6)M
a) Programmed I/O
b) Interrupt driven I/O
c) DMA Controller
SECTION – IV
7. a) Explain the concept of Protection and security in operating systems?
7M
b) What is segmentation? Explain
7M
OR
8. a) What is dead lock Explain dead lock prevention mechanism
7M
b) Explain about the implementation of the hashed page table approach.
7M
SECTION – V
9. a) Explain how the remote file sharing can be done in RFS
7M
b) Explain different File Accessing methods
7M
OR
10. Write short notes on
(4+4+7)M
a) File sharing
b) file protection
c) File System Implementation
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
B. Tech III year – I Semester Examinations, Model Paper-1
ANTENNA AND WAVE PROPAGATION
Time: 3 hours Max. Marks: 70
SECTION-I
1. a) Explain the following terms
i) Front to Back Ratio ii) Beam Area
b) Explain the Radiation from Two wire Antenna. [7+7]
OR
2. Define the terms Directivity and Power Gain. Show that the Directivity of a
short current element is 1.5 [7+7]
SECTION-II
3.a) With neat illustrations explain the geometry and requirements for a helical antenna radiating into
Axial mode and give the relevant design relations.
b) What is folded dipole antenna? Derive the input impedance of folded dipole antenna [7+7]
OR
4. Explain the working Principal of Horn Antenna [7+7]
SECTION-III
5. a) Explain the working Principal of Lens Antenna
b) Explain the working principal of parabolic reflector Antenna [7+7]
OR
6.a) Give the expression for impedance, bandwidth and directivity of rectangular patch antenna
b) Design a rectangular micro strip antenna using a substrate with a dielectric constant of 2.2 height
h=0.1588cm so as to resonate at 10GHz [7+7]
SECTION-IV
7.a) Find the array factor and sketch the pattern of a 2-element array having equal amplitudes and
phases and having a spacing of d=λ
b) For a 16 element Broadside Array with λ/2 spacing derive the array factor and hence calculate its
BWFN,First Side lobe Level, Directivity [7+7]
OR
8 .a) With a neat block diagram, explain the method of measurement of radiation pattern of an antenna
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b) Explain the need for non-uniform amplitude distribution in a linear array, and hence sketch the pattern
of a 4 element Binomial Array. [7+7]
SECTION-V
9. a) Account for the propagation characteristics of Medium Wave Broadcast Signals.
b) Derive an Expression for the variation of field strength of a space wave, with antenna heights and
distance involved. What happens when the distance is large? [7+7]
OR
10.a) Explain the effects of D and F layers of the ionosphere on a propagation and estimate the critical
frequency and MUF for a layer with 10
11
/m
3
electron density, and incident angle of 60
0
. What are
LUF and optimum frequencies?
b) Compute the free space path loss for a link distance of 30km at a frequency of 10GHz. Also calculate
the received power, if the transmitting and receiving antennas have equal gains of 20dB,
and the transmitter power is 500W. [7+7]
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
B. Tech III year – I Semester Examinations, Model Paper-2
ANTENNA AND WAVE PROPAGATION
Time: 3 hours Max. Marks: 70
SECTION-I
1.a) A 50cm long vertical dipole operating at 30MHz radiates a maximum electric field of
15mV/m at 5Km distance. Find its power radiated, input current and maximum magnetic
field at the same distance.
b) Give the far-field expression for a λ/2 vertical dipole and hence evaluate its radiation
resistance [7+7]
OR
2. a) Discuss between power gain and directive gain
b) prove that effective length same as transmitting and receiving antenna [7+7]
SECTION-II
3. a) Write short notes on Helical Antenna
b) Explain the working principal of parabolic reflector antenna [7+7]
OR
4. a) A parabolic dish provides a power gain of 50dB at 10GHz,with 70% efficiency find out
i. HPBW
ii. BWFN, diameter
b) Sketch the current distribution of folded dipole and find out input impedance when two legs have
unequal diameter. [7+7]
SECTION-III
5.State and Explain the design parameter of horn antenna [14]
OR
6.Derive an expression for aperture field distribution of a paraboloidal reflector.[14]
SECTION-IV
7.a) What are linear array Compare broadside array and End fire array
b) Using the principle of pattern multiplication, estimate and sketch the pattern of a 8element Binomial
array by computing its amplitude coefficients. [7+7]
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OR
8. a) Describe the method of measuring the gain and radiation pattern of an antenna
b) A standard gain horn antenna with o power gain of 12.5, is used to measure the gain of a
large directional antenna by comparison method. The test antenna is connected to the
receiver and an attenuator adjusted to 23dB in order to have the same receiver output.
Find out the gain of the large antenna. [7+7]
SECTION-V
9. a) Define and distinguish between the terms i) Critical Frequency and MUF ii) Virtual height
b) Explain the significance of E and F layers of ionosphere, and account for the multi-hop propagation
of sky waves[7+7]
OR
10. a) Sketch and Explain the field strength variation of space waves, with distance and antenna
heights, deriving expressions for the same.
b) Find the MUF and refractive index for a sky wave signal reflected by a layer at a height of
200Km, and having an electron density of 2x10
11
per cubic meter, for a skip distance of
2500Km. Also calculate the corresponding angle of incidence. Explain the relations used.
[7+7]
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
B. Tech III year – I Semester Examinations, Model Paper-3
ANTENNA AND WAVE PROPAGATION
Time: 3 hours Max. Marks: 70
SECTION-I
1. a) With neat illustrations, explain the structure and formation of ionospheric layers, and
the corresponding frequencies of propagation.
b) Define the following terms: LUHF, OWF, Skip Distance [7+7]
OR
2 a) Describe the following
i) Space wave propagation ii) Duct propagation
b) VHF communication is to be established with a 50watt transmitter at 100MHz.
Calculate the LOS distance if the heights of transmitting and receiving antennas are
respectively 50m and 10m. Assuming the capture area of the transmitting antenna
Is 25m
2
, calculate the field strength at the receiving neglecting ground reflected
wave. [7+7]
SECTION-II
3. a) What are the advantages of antenna array? Explain the types of antenna arrays
b) Use principle of pattern multiplication and draw the radiation pattern with 4 element
array with d=λ/2. [7+7]
OR
4. a) With the help of neat block diagram, explain how the gain of the antenna is
measured
b) A standard gain horn antenna with o power gain of 12.5,is used to measure the gain
of a large directional antenna by comparison method. The test antenna is connected to
the receiver and an attenuator adjusted to 23dB in order to have the same receiver out
put. Find out the gain of the large antenna. [7+7]
SECTION-III
5. a) Compute the gain, principle beam width and HPBW of a 10m diameter parabolic
Dish with a half wave length dipole feed in focus at 10GHz.
b) Explain the Cassegrain mechanism in transmission mode. List out the advantages
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and disadvantages of Cassegrain feed. [7+7]
OR
6. Distinguish between fast lens and delay lens antenna and explain the principal of Lens
Antenna.[14]
SECTION-IV
7. Distinguish between the axial and normal modes of radiation characteristics of a helical
Antenna, and identify their requirements.[14]
OR
8. Explain the working principal of yagi-uda antenna[14]
SECTION-V
9. Define the terms
i) Beam width ii) Front to Back Ratio iii) Beam Area iv) Directivity[14]
OR
10. Show the radiation resistance of half wave dipole antenna is 73ohms. [14]
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
B. Tech III year – I Semester Examinations, Model Paper-4
ANTENNA AND WAVE PROPAGATION
Time: 3 hours Max. Marks: 70
SECTION-I
1.a. Define The following terms
i) Radiation Intensity ii) Effective Area
b. Define antenna beam width and directivity and obtain the relation between them [7+7]
OR
2.a.A 50cm. long vertical dipole operating at 30MHz radiates a maximum electric field of
15mV/m at 5Km distance. Find its power radiated,input current and maximum magnetic
field at the same distance.
b. With neat schematics, explain the configuration of an oscillating electric dipole and
derive its far field expressions. [7+7]
SECTION-II
3. Distinguish between the axial and normal modes of radiation characteristics of a helical
Antenna [7+7]
OR
4. State the Fermat’s Principal, and explain its applicability to Horn Antennas. List out the
standard antennas[7+7]
SECTION-III
5. a. Give the expressions for impedance, bandwidth and directivity of rectangular patch
antenna [7+7]
b. Design a rectangular microstrip antenna using a substrate with a dielectric constant of
2.2, height h=0.1588cm so as to resonate at 10GHz. [7+7]
OR
6. a Explain the working principal of parabolic antenna [7+7]
b. A parabolic dish provides a power gain of 50dB at 10GHz,with 70% efficiency find out
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i) HPBW ii)BWFN [7+7]
SECTION-IV
7. a. Find the array factor and sketch the pattern of a 2-element array having equal amplitudes
and opposite phases, and having a spacing of d=λ
b. Using the principal of pattern multiplication, estimate and sketch the pattern of a 8
isotropic elements [7+7]
OR
8.a.With a neat block diagram, explain the measurement method of the gain using direct
comparison method
b.Compare of the Linear Array and Binomial Arrays [7+7]
SECTION-V
9.a.Describe the characteristics of Ground wave Propagation
b. Derive an expression for the variation of field strength of a space wave, with antenna
heights and distance involved. [7+7]
OR
10. a. Derive the calculation of MUF of the curved earth
b. Describe the salient features of multiple hop propagation mention the permissible ranges
of frequencies. [7+7]
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
R18
B. Tech III year – I Semester Examinations, Model Paper-4
ANTENNA AND WAVE PROPAGATION
Time: 3 hours Max. Marks: 70
SECTION-I
1. a) Explain the following terms
i) Dielectric lenses ii) Radian & Steradian.
b) Explain the Radiation from an alternating current element. [7+7]
OR
2. a) Discuss relation between power gain and directive gain
b) State and Prove –‘Antenna Theorem’. [7+7]
SECTION-II
3 .a) What is an EFA and derive for its radiation pattern?
b) Explain binomial theorem and draw the radiation pattern with 4 element
array with d=λ/2. [7+7]
OR
4. a) Explain the effect of earth’s curvature in wave propagation.
b) Describe the salient features of multiple hop propagation mention the permissible ranges
of frequencies. [7+7]
SECTION-III
5.a) Derive the expression for refractive index of ionospheric layer based on ‘f’ and ‘N’.
b) What is the radiation resistance of half wave dipole & quarter wave monopole? [7+7]
OR
6. a) How to measure gain of antenna using 3 antennas.
b) From the dimensions of parabolic reflector, evaluate the directivity of the same. [7+7]
SECTION-IV
7. a) What is a lens antenna and explain dielectric len,with neat labeled diagram
b) Name the different types of waveguide horn with sketches and give their radiation properties.
[7+7]
OR
8. a) Name different types of reflector antennas and explain their working.
b) Design a rectangular microstrip antenna using a substrate with a dielectric constant of 2.2, height
h=0.1588cm so as to resonate at 10GHz. [7+7]
SECTION-V
9.a) A 50cm. long vertical dipole operating at 30MHz radiates a maximum electric field of
15mV/m at 5Km distances. Find its power radiated, input current and maximum magnetic
field at the same distance.
b. With neat schematics, explain the configuration of an oscillating electric dipole and derive its
far field expressions [7+7]
OR
10.a) Compute the gain, principle beam width and HPBW of a 10m diameter parabolic Dish with a
half wave length dipole feed in focus at 10GHz.
b) Explain the Cassegrain mechanism in transmission mode. List out the advantages and
disadvantages of Cassegrain feed.
[7+7]
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
R18
B. Tech III year – I Semester Examinations, Model Paper-5
ANTENNA AND WAVE PROPAGATION
Time: 3 hours Max. Marks: 70
SECTION-I
1.(a) Explain the following terms:
i. Beam Width
ii. Omni Directional pattern
iii. Side Lobe Level
iv. Radiation resistance
v. Field Pattern of antenna.
(b) Define the terms Directivity and Power Gain. Show that the Directivity of a
short current element is 1.5. [7+7]
OR
2. (a) Starting from the fundamentals, derive an expression for radiated electric field
for half wave dipole and sketch the field strength pattern.
(b) Prove that leff(transmitting) is same as leff(receiving) for any antenna where
leff is effective length of an antenna. [7+7]
SECTION-II
3. (a) How an unidirectional pattern is obtained in an end fire array? Explain in
detail.
(b) List out the mathematical relations for a N element half wavelength spaced
binomial array. Hence find the directivity, HPBW for N=20. [7+7]
OR
4. (a) Discuss the application of the Image antenna concept to the 900 corner reflec-
tor.
(b) What is a parabolic cylinder antenna? Derive an expression for field distrib-
utions on the surface of reflector. [7+7]
SECTION-III
5. (a) What is Zoning? What are its advantages?
(b) Discuss the applications of Horn Antenna. Sketch the sectoral horns. [7+7]
OR
6. (a) Show that Ionosphere act as a variable refractive index medium.
(b) A radio link has to be established between two earth station at a distance of
25000kms. If the height of ionosphere is 200kms and its critical frequency is
5MHz. Calculate the MUF for the given path. Also calculate the electron
density in the ionosphere layer. [7+7]
SECTION-IV
7. (a) A police radio transmitter operating at a frequency 1.69GHz is required to
provide a ground wave having a strength of 0.5mv/m at a distance of 16km.
The transmitter antenna, having an efficiency of 50% produces a radiating
field proportional of cosθ. The ground wave has σ= 5 × 10−5 mho/cm and εr
= 15. Calculate the power transmitted.
(b) Derive the fundamental equation for free space propagation. [7+7]
OR
8. (a) What are different mechanisms of propagation of electromagnetic waves? Explain.
(b) What is Critical Frequency? What is Virtual Height? Find the maximum
distance that can be covered if the virtual height of the ionospheric layer is
250kms. [7+7]
SECTION-V
9. (a) Write short notes on “M Curves and their characteristics”.
(b) Show that the radius of curvature of ray path is given by 2/(dεr/dh) for
tropospheric waves. [7+7]
OR
10. (a) Write explanatory notes on
i. Selective fading and Interference fading.
ii. Field Strength calculation for radio AM broadcast waves.
(b) A communication link is to be established between two stations using half length
antenna for maximum distance gain. Transmitter power is 1KW, distance between
transmitter and receiver is 100km. What is the maximum power received by receiver?
Frequency of operation is 100MHz. [7+7]