PTU Punjab Technical University B-Tech May 2019 Question Papers 3rd Semester Robotics-ECE-EIE
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Automation & Robotics) (2011 & Onwards) (Sem.?3)
ELECTRONICS DEVICES AND DIGITAL CIRCUITS
Subject Code : BTAR-302
M.Code : 63002
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.
SECTION-A
1.
Answer briefly :
a. Why is capacitive coupling used to connect a signal source to an amplifier?
b. Determine the base current for the CE transistor circuit if IC = 80mA and = 170.
c. Define the transconductance of MOSFET.
d. Give the advantages of switching regulator.
e. Define slew rate and its significance.
f. Draw the circuit diagram of OP-AMP as an integrator.
g. Write the frequency equation for an astable multivibrator.
h. Define propagation delay time.
i. What is the difference between combinational and sequential circuits?
j. What is the difference between Latch and a flip-flop?
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SECTION-B
Q2. Explain the Operation of common drain MOSFET amplifier. Draw and explain its V-I
characterstics.
Q3. Explain the working of CE amplifier. Also draw its V-I characteristics.
Q4. Draw the circuit diagram of Op-Amp as an inverting amplifier and derive the expression
for output voltage.
Q5. Minimize the function given below by means of Quine-McClusky method and realize it
With NAND gates.
f = (0,1,2,7,8,9,14) + (4,6,12,15)
Q6. With suitable example, design a sequential circuit using JK-flip-flop.
SECTION-C
Q7. (a) Design a 4-bit ripple counter using negative edge triggered JK flip-flop.
(b) Explain the working principle of dual slope A/D converter.
Q8. Describe the 555IC. Design an astable multivibrator circuit to generate output pulses 25%,
50% duty cycle using a 555 timer IC. With choice C = 0.01F and frequency as 4.0 KHz.
Q9. Write short notes on any two :
(a) Switching regulators
(b) Schmitt trigger
(c) V?I converters
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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This post was last modified on 04 November 2019