III B.Tech II Semester Examinations,APRIL 2011 COMMUNICATION ENGINEERING Electronics And Instrumentation Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. With the aid of sketches explain the effect on a transmitted binary signal of the following
ld .
(a) Attenuation (b) Limited Bandwidth (c) Delay Distortion (d) Line and System Noise
[16]
or
2. (a) What are the various noise components in a transistor ? Deduce its noise voltage equivalent circuit.
uW
(b) A mixture stage has a noise figure of 20 db and this is preceded by an amplifier that has a noise figure of 9 db and an average power gain of 15 db. Calculate the overall noise figure referred to the input. [8+8] 3. (a) Discuss the differences between FM and AM receivers. (b) Draw a block diagram of a superhetrodyne FM receiver and explain the functions of each block. (c) Write about fading.
[6+6+4]
nt
4. (a) Consider a carrier c(t) = Ac cos(2πfc t) and a signal m(t) = Am cos(2πfm t). Develop the expression for FM. From this define frequency deviation and modulation index. (b) What is Narrow Band FM ? Draw the block diagram of Armstrong FM generator. Bring out the role of frequency multiplier and down converters. [8+8]
5. (a) What are the advantages and disadvantages of AM over FM.
Aj
(b) Explain the balanced modulator using diodes. (c) A 500-W carrier is modulated on a depth of 75%; calculate the total power in the modulated wave in: i. AM. ii. DSB-SC. iii. SSB-SC.
[5+5+6]
6. (a) Discuss the principle behind the Frequency Division Multiplexing. (b) Compare and contrast PAM, PWM, PPM methods. 1
[6+10]
Code No: NR321001
NR
Set No. 2
7. (a) Discuss the noise considerations in PCM. Give the influence of Eb/No on the probability of error. (b) Discuss the applications of M-ary modulation schemes.
[8+8]
8. (a) Explain the function of balanced modulators.
i. What is the operating frequency range of short wave transmitters. ii. The centre frequency of the modulator in the FM transmitter having five doublers is 1.2 MHz with a deviation frequency of 1 kHz .What is the resulting output deviation frequency. [4+6+6]
Aj
nt
uW
or
?????
ld .
(c)
in
(b) What is the advantage gained from using a pre-emphasis circuit in the Armstrong transmitter.
2
Code No: NR321001
NR
Set No. 4
1. (a) Explain the function of balanced modulators.
in
III B.Tech II Semester Examinations,APRIL 2011 COMMUNICATION ENGINEERING Electronics And Instrumentation Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
(c)
ld .
(b) What is the advantage gained from using a pre-emphasis circuit in the Armstrong transmitter.
i. What is the operating frequency range of short wave transmitters. ii. The centre frequency of the modulator in the FM transmitter having five doublers is 1.2 MHz with a deviation frequency of 1 kHz .What is the resulting output deviation frequency. [4+6+6]
(a) Attenuation (b) Limited Bandwidth
uW
(c) Delay Distortion
or
2. With the aid of sketches explain the effect on a transmitted binary signal of the following
(d) Line and System Noise
[16]
3. (a) Consider a carrier c(t) = Ac cos(2πfc t) and a signal m(t) = Am cos(2πfm t). Develop the expression for FM. From this define frequency deviation and modulation index.
nt
(b) What is Narrow Band FM ? Draw the block diagram of Armstrong FM generator. Bring out the role of frequency multiplier and down converters. [8+8] 4. (a) What are the advantages and disadvantages of AM over FM. (b) Explain the balanced modulator using diodes.
Aj
(c) A 500-W carrier is modulated on a depth of 75%; calculate the total power in the modulated wave in: i. AM. ii. DSB-SC. iii. SSB-SC.
[5+5+6]
5. (a) Discuss the principle behind the Frequency Division Multiplexing. (b) Compare and contrast PAM, PWM, PPM methods.
[6+10]
6. (a) Discuss the noise considerations in PCM. Give the influence of Eb/No on the probability of error.
3
Code No: NR321001
NR
Set No. 4
(b) Discuss the applications of M-ary modulation schemes.
[8+8]
7. (a) What are the various noise components in a transistor ? Deduce its noise voltage equivalent circuit.
8. (a) Discuss the differences between FM and AM receivers.
in
(b) A mixture stage has a noise figure of 20 db and this is preceded by an amplifier that has a noise figure of 9 db and an average power gain of 15 db. Calculate the overall noise figure referred to the input. [8+8]
(b) Draw a block diagram of a superhetrodyne FM receiver and explain the functions of each block.
[6+6+4]
Aj
nt
uW
or
?????
ld .
(c) Write about fading.
4
Code No: NR321001
NR
Set No. 1
1. (a) Discuss the differences between FM and AM receivers.
in
III B.Tech II Semester Examinations,APRIL 2011 COMMUNICATION ENGINEERING Electronics And Instrumentation Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
(b) Draw a block diagram of a superhetrodyne FM receiver and explain the functions of each block. (c) Write about fading.
[6+6+4]
2. With the aid of sketches explain the effect on a transmitted binary signal of the following
(b) Limited Bandwidth (c) Delay Distortion (d) Line and System Noise
or
(a) Attenuation
[16]
uW
3. (a) Consider a carrier c(t) = Ac cos(2πfc t) and a signal m(t) = Am cos(2πfm t). Develop the expression for FM. From this define frequency deviation and modulation index. (b) What is Narrow Band FM ? Draw the block diagram of Armstrong FM generator. Bring out the role of frequency multiplier and down converters. [8+8] 4. (a) Explain the function of balanced modulators.
nt
(b) What is the advantage gained from using a pre-emphasis circuit in the Armstrong transmitter. i. What is the operating frequency range of short wave transmitters. ii. The centre frequency of the modulator in the FM transmitter having five doublers is 1.2 MHz with a deviation frequency of 1 kHz .What is the resulting output deviation frequency. [4+6+6]
Aj
(c)
5. (a) Discuss the principle behind the Frequency Division Multiplexing. (b) Compare and contrast PAM, PWM, PPM methods.
[6+10]
6. (a) What are the advantages and disadvantages of AM over FM. (b) Explain the balanced modulator using diodes. (c) A 500-W carrier is modulated on a depth of 75%; calculate the total power in the modulated wave in: i. AM. 5
Code No: NR321001
NR
Set No. 1
ii. DSB-SC. iii. SSB-SC.
[5+5+6]
7. (a) Discuss the noise considerations in PCM. Give the influence of Eb/No on the probability of error. (b) Discuss the applications of M-ary modulation schemes.
[8+8]
in
8. (a) What are the various noise components in a transistor ? Deduce its noise voltage equivalent circuit.
Aj
nt
uW
or
?????
ld .
(b) A mixture stage has a noise figure of 20 db and this is preceded by an amplifier that has a noise figure of 9 db and an average power gain of 15 db. Calculate the overall noise figure referred to the input. [8+8]
6
Code No: NR321001
NR
Set No. 3
in
III B.Tech II Semester Examinations,APRIL 2011 COMMUNICATION ENGINEERING Electronics And Instrumentation Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Discuss the principle behind the Frequency Division Multiplexing.
[6+10]
ld .
(b) Compare and contrast PAM, PWM, PPM methods.
2. (a) Discuss the noise considerations in PCM. Give the influence of Eb/No on the probability of error. (b) Discuss the applications of M-ary modulation schemes.
[8+8]
3. (a) Discuss the differences between FM and AM receivers.
(c) Write about fading.
or
(b) Draw a block diagram of a superhetrodyne FM receiver and explain the functions of each block.
[6+6+4]
4. (a) Explain the function of balanced modulators.
(c)
uW
(b) What is the advantage gained from using a pre-emphasis circuit in the Armstrong transmitter. i. What is the operating frequency range of short wave transmitters. ii. The centre frequency of the modulator in the FM transmitter having five doublers is 1.2 MHz with a deviation frequency of 1 kHz .What is the resulting output deviation frequency. [4+6+6]
nt
5. (a) Consider a carrier c(t) = Ac cos(2πfc t) and a signal m(t) = Am cos(2πfm t). Develop the expression for FM. From this define frequency deviation and modulation index. (b) What is Narrow Band FM ? Draw the block diagram of Armstrong FM generator. Bring out the role of frequency multiplier and down converters. [8+8]
Aj
6. (a) What are the various noise components in a transistor ? Deduce its noise voltage equivalent circuit. (b) A mixture stage has a noise figure of 20 db and this is preceded by an amplifier that has a noise figure of 9 db and an average power gain of 15 db. Calculate the overall noise figure referred to the input. [8+8]
7. With the aid of sketches explain the effect on a transmitted binary signal of the following (a) Attenuation (b) Limited Bandwidth 7
Code No: NR321001
NR
Set No. 3
(c) Delay Distortion (d) Line and System Noise
[16]
8. (a) What are the advantages and disadvantages of AM over FM. (b) Explain the balanced modulator using diodes.
in
(c) A 500-W carrier is modulated on a depth of 75%; calculate the total power in the modulated wave in: i. AM. ii. DSB-SC. iii. SSB-SC.
(b) What is Narrow Band FM ? Draw the block diagram of Armstrong FM gen- · erator. Bring out the role of frequency multiplier and down converters. [8+8].
iii. Domain. [2+2+3] · 4. (a) Develop an example showing how a single locking protocol could lead to a ... (b) What is the oldest log record that we need to retain?
is assumed as an ideal gas, prepare a P-x-y diagram for this system at 50 oC. ... lnp2 sat / Kpa = 16.059381 - 3644.297/(t oC +239.765). [16]. 3. AjntuWorld.in ...
(a) Give the classification of solid state Microwave devices along with examples? (b) Why conventional tubes and solid state devices can not be used at ...
2. 5. Derive equations to describe the displacement diagram of a cam which rises with ... cam rotation angle is à Plot the displacement diagram and its first three ...
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(b) Write the code for printing the message 'IBM PC ASSEBLY LANGUAGE · PROGRAMMING' ... 3. (a) What is the BIOS memory location of the keyboard buffer?
Determine the heat transferred during the process and the final pressure. [16] · 8. (a) A gas mixture consisting of 20% ethane and 80% oxygen at 298K is burned.
(b) Explain how number of page faults can be calculated for the given page trace · using FIFO page replacement strategy. (Assume 3 frames are available in the.
(a) Differentiate between transmission path, virtual path and virtual circuit. [6] · (b) Explain link state routing with an example. [10] · 2. (a) Does the TC sublayer ...
Figure 5. 7. (a) Derive the expression for potential at any point due to a point charge Q and also write electric field in rectangular co ordinate system. [8]. 3.
A grass hopper straight line mechanisms gets its motion from a crank OA. The end · A of the crank in joined to a long rod PQ such that Q A is 6cm. The end Q is.
(b) Show and deduce the relation between stream and velocity potential ... gradient and the boundary spacing for the case of laminar flow between parallel.
Max Marks: 80 · Answer any FIVE Questions · All Questions carry equal marks ... ii. Editor Area · iii. Output pane. [6+10] · 6. Design a custom dialog box using ...
Common to Electronics And Telematics, Electronics And Control · Engineering ... NR. Set No. 2. 7. (a) Compare the Digital Butterworth and Chebyshev filters.
(a) What is meant by monitor? How the monitor concept is used in solving mutual · exclusion problem? (b) How the processors are communicating with each ...
2. (a) Find the mean and standard deviation of a normal distribution in which 7% ... (a) Predict y at x=5 by fitting a least squares straight line to the following data:.
Figure 4a. (b) State different properties of Fourier series. [4M]. 5. (a) Find the inverse z transform of X (z) using power series method, given. X (z)=1/[1-az−1],|z| ...
5. Define maximum usable frequency and derive an expression for the same in the · case of a thin ionospheric layer over a plane earth. Explain what is meant by ...
(b) What are the advantages and disadvantages of having excess inventories?[8+8] · 7. Define the organization's environment. Describe the various factors in an ...
