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Old April 27th, 2014, 11:14 AM
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Default Communication Engineering previous years question papers IETE DIPIETE-ET (Old Scheme)

Can you please give me the Communication Engineering previous years question papers IETE DIPIETE-ET (Old Scheme) as it is very urgent for me?
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Old April 28th, 2014, 04:25 PM
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Default Re: Communication Engineering previous years question papers IETE DIPIETE-ET (Old Sch

As you want to get the Communication Engineering previous years question papers IETE DIPIETE-ET (Old Scheme) so here is the information of the same for you:

Communication Engineering previous years question papers IETE DIPIETE-ET (Old Scheme

Q.1 Choose the correct or the best alternative in the following: (210)
a. The modulation index of an AM wave is changed from 0 to 1. The
transmitted power is __________
(A) unchanged. (B) halved.
(C) Doubled. (D) increased by 50 percent.
b. Indicate which one of the following is not an advantage of FM over AM
(A) better noise immunity is provided.
(B) lower bandwidth is required.
(C) the transmitter power is more useful.
(D) less modulating power is required.
c. An antenna that is circularly polarized is __________
(A) Helical. (B) Small circular loop.
(C) Parabolic reflector. (D) Yagi-Uda.
d. The wavelength of a wave in a waveguide ___________
(A) is greater than in free space.
(B) depends only on the waveguide dimensions and the free space
wavelength.
(C) is inversely proportional to the phase velocity.
(D) is directly proportional to the group velocity.
e. The biggest disadvantage of PCM is ___________.
(A) its inability to handle analog signals.
(B) high error rate which its quantizing noise introduces.
(C) its incompatibility with TDM.
(D) the large bandwidth that is required for it.
JUNE 2011
DE12 / JUNE – 2011 2 DipIETE – ET (OLD SCHEME)
f. The signals sent by the TV transmitter to ensure correct scanning in the
receiver are called __________
(A) Sync. (B) Chroma.
(C) Luminance. (D) Video.
g. Losses in optical fibers are not caused by __________
(A) Impurities. (B) micro bending.
(C) attenuation in the glass. (D) stepped index operation.
h. A geostationary satellite ____________
(A) is motionless in space.
(B) is not really stationary at all, but orbits the earth within a 24 hour
period.
(C) appears stationary over the earth’s magnetic pole.
(D) is located at a height of 35800 KM to ensure global coverage.
i. Which of the following is an application of PLL __________
(A) Voltage regulation. (B) FM modulation.
(C) FM demodulation. (D) AM modulation.
j. The Noise Figure of a receiver connected to an antenna whose resistance is 50
ohm and has an equivalent noise resistance of 30 ohm is _________
(A) 5.36 dB (B) 1.65 dB
(C) 3.44 dB (D) 2.04 dB
Answer any FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. Draw the block diagram of a communication system and explain, the
function of each block. (8)
b. Explain the terms related to noise:
(i) Thermal noise.
(ii) Shot noise.
(iii) Transit noise. (8)
Q.3 a. Explain the suppression of unwanted sidebands using Filter method. (8)
b. Draw the block diagram of an AM superhetrodyne receiver and explain its
operation with the help of waveforms at different stages. (8)
Q.4 a. Draw the circuit diagram of a Ratio Detector and explain its principle of
operation. (8)
b. Explain Pre-emphasis and De-emphasis as used in FM system. (8)
DE12 / JUNE – 2011 3 DipIETE – ET (OLD SCHEME)
Q.5 a. Explain the function of (i) Phase Comparator and (ii) VCO of a PLL
system. (8)
b. State Sampling Theorem and explain Pulse Amplitude Modulation (PAM). (8)
Q.6 a. What do you mean by Sky wave Propagation? What are the different
layers formed in Sky Wave Propagation and explain each layers in brief. (8)
b. Explain the following terms with respect to antenna:
(i) radiation resistance (ii) bandwidth (iii) beam width and (iv) polarization (8)
Q.7 a. List out the various error detection and correction techniques used in data
communication and explain any one of them clearly with suitable
examples. (8)
b. Explain interlaced scanning used in television system. (8)
Q.8 a. What is a waveguide and explain various modes of transmission modes in
a Waveguide. (6)
b. What is characteristic impedance of a transmission line and explain the
Primary and Secondary constants of a transmission line. (5)
c. List out the advantages of optical fibers over coaxial cables. (5)
Q.9 Write short notes on any TWO of the following: (28)
(i) Frequency Division Multiplexing (FDM)
(ii) Pulse Code Modulation (PCM)
(iii) Block diagram of Monochrome TV receiver

Q.1 Choose the correct or best alternative in the following: (210)
a. To transmit a signal of 1 kHz, the length of the antenna required without
modulation is ___________
(A) 1 meter (B) 3 km
(C) 300 km (D) 3 meters
b. Noise is a signal that ________
(A) carries meaningful information
(B) distorts meaningful information signal
(C) has a particular frequency
(D) has fixed phase
c. A base band signal is given by Vm = t 300 2 sin and the carrier signal is given
by Vc = t 10 2 sin 2 6
. The bandwidth of the AM modulated signal is then given
by _________
(A) 106 Hz. (B) 600 Hz.
(C) 300 Hz. (D) 1012 Hz.
d. In a Balanced Modulator circuit, there __________
(A) are 2 AM circuits with the baseband fed to one of them after
o
180
phase shift.
(B) is one AM circuit and a demodulator circuit.
(C) is one demodulator circuit only.
(D) is no circuit.
DECEMBER 2010
DE12/ DEC. – 2010 2 DipIETE – ET (OLD SCHEME)
e. In frequency modulation the baseband signal affects ___________
(A) the amplitude of the signal only.
(B) the frequency & the phase of the signal.
(C) the frequency only.
(D) frequency, phase & amplitude of the carrier signal.
f. The minimum rate of sampling required for conversion of an analog signal to
digital is ______________
(A) fs > 2fm (B) fs = fm
(C) fs< 2fm (D) fs g. The error rate in quantization method is __________
(A) S3/12 (B) S4/12
(C) S/12 (D) S2/12 .
h. In Delta Modulation __________
(A) the baseband signal is encoded into 1 bit.
(B) the difference signal is encoded into 1 bit.
(C) the difference signal is encoded into 2n bits.
(D) the baseband signal is encoded into 2n bits.
i. In Pulse Code Modulation _____________
(A) the sampled signals are binary coded.
(B) the quantized signals are binary coded.
(C) the baseband signal is directly binary coded.
(D) All of the above.
j. Optical Fiber communication uses _________
(A) total internal reflection of light waves.
(B) reflection of EM signals.
(C) refraction of EM signals.
(D) None of the above.
Answer any FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. Explain the working of a monochrome TV receiver with a neat-block
diagram. What type of modulation schemes are used for audio & video TV
transmission? (10)
b. Explain with suitable diagram, why quantization error occurs. (6)
DE12/ DEC. – 2010 3 DipIETE – ET (OLD SCHEME)
Q.3 a. Explain with suitable diagram, how pre-emphasis & de-emphasis helps in
reducing noise in FM systems. (8)
b. Explain the working of a PLL in demodulating FM. (8)
Q.4 a. Explain with suitable diagram how DSB-SC signals are generated. (8)
b. Explain the Armstrong method of FM generation. (8)
Q.5 a. Explain how transmission of light takes place in an optical fiber. (8)
b. What is Photo detector? Describe PIN photo diode with the help of diagram.
(8)
Q.6 a. What is a waveguide? How does transmission of electromagnetic waves take
place in a waveguide. (8)
b. Explain how PCM is generated for an analog signal. (8)
Q.7 a. What is a dipole antenna? Explain its working with radiation pattern. (8)
b. Explain the difference between sky wave propagation and ground wave
propagation. (8)
Q.8 Write Short notes on any TWO (28)
(i) Generation of AM using balanced modulator.
(ii) Comparison of TDM and FDM
(iii) Error correction techniques in Digital modulation.
(iv) Block diagram of TV transmitter.
Q.9 a. (i) Explain the terms Orbit, Apogee and Perigee.
(ii) What is geostationary satellite and explain why is it needed? (8)
b. Give the fundamentals and applications of cavity resonators. (8)
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