Download PTU B-Tech EEE 2020 Dec 3rd Sem 57092 Circuit Theory Question Paper

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Roll No. LT HEEE Total No. of Pages : 03

Total No. of Questions : 18

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B.Tech. (EE) (2012 Onwards) / (Electrical & Electronics Engg.) (2011 Onwards)

B.Tech. (Electronics & Electrical Engg./ Electrical Engineering & Industrial Control) (2012 to 2017) (Sem.-3)

CIRCUIT THEORY

Subject Code : BTEE-301

M.Code : 57092

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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.

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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?

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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 3O, 5O, 10O and 20O, how much voltage and current will be there across 5O resistor?

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9. Give the condition for selecting the resonant frequency in m-derived high pass and low-pass filters.
10. What is the driving point impedance at port one with port two open circuited for the given circuit :

Fig.1

SECTION-B

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11. For the given two port network calculate the short circuit parameters.

Fig.2

12. Find the frequency at which a prototype T-section lowpass filter having cut-off frequency f have an attenuation of 15dB.
13. Determine the current in the 5O resistor for the circuit shown using nodal analysis.

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Fig.3

14. If I(s) = (s²+5s+9) / (s³+5s²+12s+8), find i(t)
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.

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Fig4

SECTION-C

16. The driving point impedance is given by : Z(s) = (s² +4)(s² +25) / s(s² +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 600O and m=0.3.
18. Find current I, in the 5O resistor using Thevenin theorem and verify the result using Norton theorem.

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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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