Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (EEE)- Electrical And Electronics Engineering 2020 December 3rd Sem 57092 Circuit Theory Previous Question Paper
Roll No.
Total No. of Pages : 03
Total No. of Questions : 18
B.T ech. (EE) (2012 Onwards) / (Electrical & Electronics Engg.) (2011 Onwards)
B.T ech. (Electronics & Electrical Engg./ Electrical Engineering & Industrial
Control) (2012 to 2017) (Sem.?3)
CIRCUIT THEORY
Subject Code : BTEE-301
M.Code : 57092
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O 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 :
1.
State and derive maximum power transfer theorem.
2.
State convolution theorem.
3.
What are filters and state its various types?
4.
What are open circuit parameters? Give the equivalent circuit.
5.
Define decibel and Neper.
6.
Define reciprocity networks and give the condition of reciprocity in context to two-port
networks.
7.
What is the difference between active and passive elements? Give example.
8.
If a 10V battery is connected across the parallel resistors of 3, 5, 10 and 20, how
much voltage and current will be there across 5 resistor?
9.
Give the condition for selecting the resonant frequency in m-derived high pass and low-
pass filters.
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10. What is the driving point impedance at port one with port two open circuited for the
given circuit :
I
1
1
1
I2
V
2
1
V2
Fig.1
SECTION-B
11. For the given two port network calculate the short circuit parameters.
I
5
1
10
V1
V
10
4
2
Fig.2
12. Find the frequency at which a prototype T-section lowpass filter having cut-off frequency
fc have an attenuation of 15dB.
13. Determine the current in the 5 resistor for the circuit shown using nodal analysis.
2
20V
+ ?
5
10A
3
1
2
10V
Fig.3
2
s 5s 9
14. If I (s)
; find i(t)
3
2
s 5s 12s 8
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15. In the circuit shown, steady state is reached with switch open. Switch is closed at t=0.
Determine i(t) and v(t) for t>0.
2
1H
i t
( )
+1F
+
1
?
50V
?
v (t)
2
S
t = 0
Fig.4
SECTION-C
16. The driving point impedance is given by :
2s 4 2s 25
Z (s) 5
s 2
s 16
Obtain the Foster-I and Cauer-II networks.
17. Design a m-derived high pass filter having cut-off frequency of 10KHz, design
impedance of 600 and m=0.3.
18. Find current IL in the 5 resistor using Thevenin theorem and verify the result using
Norton theorem.
10
2
L A
30A
5
5
1 1
B
Fig.5
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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(S2)-411
This post was last modified on 13 February 2021