Name of the College : Dasari Jhansi Rani Institute Of Engineering And Technology
University : JNTUK
Department : Electronics & Communication Engineering
Subject Code/Name : EC05032 – Analog Communications
Year : 2008
Degree : B.Tech
Year/Sem : IV/I
Website : djriet.edu.in
Document Type : Model Question Paper
Download Analog Communications Model Question Paper: https://www.pdfquestion.in/uploads/djriet.edu.in/3002-EC05032-ANALOG-COMMUNICATIONS-set1.pdf
DJRIET Analog Communications Question Paper
IV B.Tech I Semester Regular Examinations, November 2008 :
ANALOG COMMUNICATIONS :
(Electronics & Communication Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions :
Related : Dasari Jhansi Rani Institute Of Engineering And Technology RR220501 Computer Organization B.Tech Question Paper : www.pdfquestion.in/2960.html
Set – I
All Questions carry equal marks :
1. (a) Explain operation of square law detector with circuit diagram and waveforms.
(b) An AM transmitter has un-modulated carrier power of 10 KW. It can be modulated by sinusoidal modulating voltage to a maximum depth of 40%, without overloading. If the maximum modulation index is reduced to 30% what is the extent up to which the un modulated carrier power can be increased to avoid over loading. [8+8]
2. Considering the modulating and carrier waves as sinusoids, Explain the single tone modulation and demodulation of DSB-SC wave with necessary expressions, waveforms and spectrums and explain how only one side band is necessary for transmission of information. [16]
3. (a) An SSB signal is de-modulated by using a synchronous de-modulator. The local carrier has phase error. Determine the effect of error on de-modulation. What will be the effect of this error, if input is DSB-SC in place of SSB?
(b) Determine the percentage power saving when carrier wave and one of the side bands are suppressed in an AM wave modulated to a depth of
i. 100%
ii. 50%. [8+8]
4. Explain demodulation of FM signal with the help of PLL. [16]
5. (a) Derive the expression for figure of merit of AM system for large case.
(b) Given an analog base band communication system with additive white noise having power spectral density 2 and a distorting channel having the frequency response. The distortion is equalized by a receiver filter having the frequency Obtain an expression for the output SNR. [16]
6. (a) Classify radio transmitters in detail.
(b) Compare low level modulation and high level modulation of radio transmitters. [16]
7. (a) Draw the block diagram of a superhet receiver designed to receive FM signals and explain its working.
(b) A broadcast superhet receiver does not employ RF stage and has loaded Q of the antenna coupling circuit at mixer as 125. the IF used is 455KHz. Find the image frequency and IFRR at 1000 KHz, 1500 KHz and 10 MHz. [16]
8. (a) What is the fundamental difference between pulse modulation, on the one hand, and frequency and amplitude modulation on the other?
(b) What is pulse width modulation? What other names does it have? How is it demodulated? [16]
Set – II
1. (a) Draw and explain the timing of read operation in both synchronous and asynchronous timing.
(b) Discuss various data transfer types supported by buses [8+8]
2. (a) Explain about booth coding
(b) Find the booth coded numbers of the following binary numbers
i. 01101111101
ii. 000111110110 [8+8]
3. NOOP instruction has no effect on the CPU state other than incrementing the program counter. Suggest some uses of this instruction with examples. [16]
4. (a) Explain about the machine state register.
(b) Discuss about the sequence of steps that occurs when an interrupt occurs [6+10]
5. (a) Explain the purpose of address translation. Give a general block diagram of it.
(b) Differentiate between segment table and page table. [10+6]
6. Discuss the major functions and requirements for an I/O module. [16]
7. (a) Explain about microinstruction format of TI 8800
(b) Explain about ALU control fields of IBM 3033 microinstruction. [8+8]
8. (a) Differentiate between two-stage and four-stage pipelines
(b) Discuss the demerits of pipelined processing. [10+6]