Download PTU B.Tech 2020 March ECE 5th Sem EC 309 Pulse And Digital Switching Circuit Question Paper

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ECE (Electronics And Communications Engineering) 2020 March 5th Sem EC 309 Pulse And Digital Switching Circuit Previous Question Paper

1 | M-57523 (S2)-2727
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (ECE) (Sem.?5)
PULSE AND DIGITAL SWITCHING CIRCUIT
Subject Code : EC-309
M.Code : 57523
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. Why are ringing circuits used? Discuss
b. Why is non-saturating bistable multivibrators used?
c. Draw the circuit for op-amp astable multivibrators.
d. How does transistor act as switch?
e. Explain charge storage phenomenon.
f. Differentiate between linear and non-linear wave-shaping circuits.
g. Explain the term distributed amplifiers.
h. Discuss high frequency compensation in wide band amplifier.
i. How does Schottky diode reduce storage time in the transistor?
j. Draw transistor based circuit diagram of Schmitt trigger.
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1 | M-57523 (S2)-2727
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (ECE) (Sem.?5)
PULSE AND DIGITAL SWITCHING CIRCUIT
Subject Code : EC-309
M.Code : 57523
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. Why are ringing circuits used? Discuss
b. Why is non-saturating bistable multivibrators used?
c. Draw the circuit for op-amp astable multivibrators.
d. How does transistor act as switch?
e. Explain charge storage phenomenon.
f. Differentiate between linear and non-linear wave-shaping circuits.
g. Explain the term distributed amplifiers.
h. Discuss high frequency compensation in wide band amplifier.
i. How does Schottky diode reduce storage time in the transistor?
j. Draw transistor based circuit diagram of Schmitt trigger.
2 | M-57523 (S2)-2727
SECTION-B
2. Draw and explain the circuit of transistor clipper with the help of waveforms.
3. How low pass RC circuit may be used as integrator? Explain
4. What do you mean by symmetrical and unsymmetrical triggering in multivibrators?
Explain.
5. With the help of circuit diagram and waveform, explain the operation of collector
coupled transistor bistable multivibrators.
6. Explain the applications of Voltage Comparators.

SECTION-C
7. Write a short note on :
a) Rise Time
b) Fall Time
c) Clamping circuits
d) Distributed Amplifiers
8. Discuss the steady state switching behaviour and characteristics of the semiconductor
diode.
9. Explain the operation of unsymmetrical triggering using is done using a unilateral device.




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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