Download PTU B.Tech 2020 March EEE 6th Sem Elements Of Communication System Question Paper

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Roll No. HEEEEEEEEEN Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Electrical & Electronics Engg.) (OE 2013 Onwards Batch)
(Sem.-6)

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

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1. Answer briefly :
   1. What is the need of modulation ?
   2. A single side band contains 1 kW power. How much power is contained in the side bands and how much in the carrier?
   3. Write basic difference between low level and high level modulation.
   4. Define angle modulation.
   5. The maximum frequency deviation in an FM is 10kHz and signal frequency is 10kHz. Find out the bandwidth using Carson's rule and the modulation index.

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   6. What is FM Capture effect?
   7. Define Sensitivity and Fidelity of radio receiver.
   8. Define noise triangle.
   9. For an 8-PSK system, operating with an information bit rate of 24 kbps, determine bandwidth efficiency.
   10. Define pulse width modulation.

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SECTION-B

2. What is Freqency Shift Keying (FSK) ? Explain FSK bit rate, Baud rate, Bandwidth and frequency spectra of FSK.
3. Consider a message signal m(t) with a spectrum shown below. The message bandwidth w = 1 kHz. This signal is applied to a product modulator, together with a carrier wave A_c Cos(2pf_ct)producing the DSBSC modulated signal S(t). The modulated signal is next applied to a coherent detector. Assuming perfect synchronism between carrier wave in the modulator and detector. Determine the spectrum of the detector output when (i) f_c =1.25 kHz, (i) f_c = 0.75 kHz. What is the lowest carrier frequency for which each component of the modulated signal S(t) is uniquely determined by m(t).
   

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