Download PTU B.Tech 2020 March ECE 5th Sem EC 301 Analog Communication Systems Question Paper

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Roll No. HEEEEEEEEEE Total No. of Pages : 02

Total No. of Questions : 09

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B.Tech. (ECE) (Sem.-5)

ANALOG COMMUNICATION SYSTEMS

Subject Code : EC-301

M.Code : 57519

Time : 3 Hrs. Max. Marks : 60

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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. Write briefly :
   1. What is the need of modulation?
   2. Explain the difference between AM and FM using their modulated output.
   3. What is the difference between phase and frequency modulation?
   4. Explain the significance of sensitivity of a receiver.
   5. Explain the need of mixer stage in AM receiver.

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   6. What is the function of phase locked loop circuit in AM receiver?
   7. What is need of VSB modulation?
   8. What is the advantage of Ratio detector?
   9. What is heterodyne process in AM receiver?
   10. What is flat top sampling in PAM?

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SECTION-B

2. How much power is saved due to carrier suppression in AM? Explain it with required expressions.
3. Draw and explain nonlinear AM modulator.
4. Explain AM detector with AGC using a neat block diagram.

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5. Explain the quadrature FM demodulator with a neat block diagram.
6. Draw and explain single sideband envelop detection receiver.

SECTION-C

7. Draw and explain the operation of Foster Seeley discriminator with neat diagram.
8. Explain the pulse position modulation (PPM) demodulator with neat diagram.

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9. Write short notes on following :
   1. Pulse width Modulation
   2. Self exited additive mixers

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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