Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (EEE)- Electrical And Electronics Engineering 2020 December 3rd Sem 57095 Electronic Devices And Circuits Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (EE) (20 12 Onwards) / (Electrical & Electronics Engg.) (2011 Onwards )
B.Tech. (Electronic s & Electrical Engg./ Electrical Engineering & Industrial
Control) (20 12 to 201 7) (Sem.?3)
ELECTRONIC DEVICES AND CIRCUITS
Subject Code : BTEE-304
M.Code : 57095
Time : 3 Hrs. Max. Marks : 60
INST RUCT ION TO CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Answer briefly :
Q1 How do you distinguish between tow leads of an LED?
Q2 Why the space charge region is also called the depletion region?
Q3 How transistor "" and "" are related?
Q4 Why is the input impedance of the MOSFET very high?
Q5 List the ideal characteristics of operational amplifier.
Q6 Define CMRR.
Q7 Why the series regulator is mostly commonly used regulator circuitry?
Q8 Define line and load regulation.
Q9 State the conditions under which a feedback amplifier works as an oscillator?
Q10 What is the basic principle of operation of crystal oscillator?
SECTION-B
Q11 Draw the circuit diagram of half wave rectifier. What is the minimum frequency of ripple
in its output?
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Q12 Draw CB configuration circuit diagram and explain with characteristics.
Q13 Explain the working of RC phase shift oscillator and state some of its applications.
Q14 In the circuit shown below R1 = 5k and R2 = 105 k.
v s
+
v O
?
R2
R1
Fig.1
Assume that the op-amp is ideal. Determine the closed-loop gain, G = v0 / vs.
Q15 Draw the pin package and circuit diagram of LM317 and explain its working.
SECTION-C
Q16 Draw the various types of biasing circuits and explain voltage divider biasing circuit
using expressions.
Q17 If RS is connected in series with the zener diode to limit the current flow through the
diode with the voltage source. A 10.0V stabilized power supply is required to be
produced from a 24V DC power supply input source. The maximum power rating Pz of
the Zener diode is 2W. Using the above data calculate :
a) The maximum current flowing through the Zener diode.
b) The minimum value of the series resistor, Rs
c) The Zener current Iz at full load.
d) The load current IL if a load resistor of 2k is connected across the Zener diode.
Q18 Explain any two with necessary diagrams ;
a) 555 timer.
b) SMPS.
c) RC low pass filter.
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 13 February 2021