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

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ECE (Electronics And Communications Engineering) 2020 March 5th Sem EC 301 Analog Communication Systems Previous Question Paper

1 | M-57519 (S2)-2737
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (ECE) (Sem.?5)
ANALOG COMMUNICATION SYSTEMS
Subject Code : EC-301
M.Code : 57519
Time : 3 Hrs. Max. Marks : 60
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
1. Write briefly :
a. What is the need of modulation?
b. Explain the difference between AM and FM using their modulated output.
c. What is the difference between phase and frequency modulation?
d. Explain the significance of sensitivity of a receiver.
e. Explain the need of mixer stage in AM receiver.
f. What is the function of phase locked loop circuit in AM receiver?
g. What is need of VSB modulation?
h. What is the advantage of Ratio detector?
i. What is heterodyne process in AM receiver?
j. What is flat top sampling in PAM?

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1 | M-57519 (S2)-2737
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (ECE) (Sem.?5)
ANALOG COMMUNICATION SYSTEMS
Subject Code : EC-301
M.Code : 57519
Time : 3 Hrs. Max. Marks : 60
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
1. Write briefly :
a. What is the need of modulation?
b. Explain the difference between AM and FM using their modulated output.
c. What is the difference between phase and frequency modulation?
d. Explain the significance of sensitivity of a receiver.
e. Explain the need of mixer stage in AM receiver.
f. What is the function of phase locked loop circuit in AM receiver?
g. What is need of VSB modulation?
h. What is the advantage of Ratio detector?
i. What is heterodyne process in AM receiver?
j. What is flat top sampling in PAM?

2 | M-57519 (S2)-2737
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.
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.
9. Write short notes on following :
(a) Pulse width Modulation
(b) 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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