Download PTU B.Tech 2021 Jan ECE 3rd Sem 78749 Network Theory Question Paper

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Roll No. :

Total No. of Pages : 03

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Total No. of Questions : 18

B.Tech. (ECE) (Sem.-3)

NETWORK THEORY

Subject Code : UC-BTEC-304-19

M.Code : 78749

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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.

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3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

Write briefly :

1. Relate unit impulse, unit step and unit ramp signals?
2. Draw waveform for the function f(t) = u(t) - r(t-1) + r(t-2).

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3. Differentiate between series and parallel resonance.
4. Draw h-model for BJT and write its characteristics equations.
5. Under what conditions we can transfer maximum power to the load?
6. How Routh-Hurwitz criterion is helpful in determining of system stability?
7. What are Dirichlet's conditions for Fourier Series?

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8. Define image impedance for a 2-port network.
9. What is current division rule?
10. What are transmission parameters? Give characteristic equations.

SECTION-B

1. Solve following differential equation using Laplace Transform y'' - 5y' + 6y = 0, y'(0) = 2, y(0) = 0

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2. In reference to following star-delta equivalent circuits, determine Ra, Rb and Rc in delta connections when R₁ = 6O, R₂ = 18O and R₃ = 3O.
3. Determine Z-parameters for following 2-port network.
4. Determine and plot output voltage V_o(t) in following circuit when input voltage signal is given by V_i(t) = u(t) - u(t-1)
5. Determine if following system H(s) is a stable system or not. Explain with reasons.
   H(s) = (s² + 2s¹ + 3s + 4) / (s⁵ + 3s⁴ + 2s³ + 3s² + 2s + 1)

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SECTION-C

1. Derive conversion formulas for 2-port networks:
1. h-parameters into ABCD-parameters
2. ABCD-parameters into Z-parameters
2. Synthesize following 1-port networks

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1. Z(s) = (10(s²+4) (s²+25)) / (s(s²+9)) using Foster-1 Form
2. Z(s) = (s³+4s) / (s²+20s+9) using Cauer-1 Form
3. 1. Design constant-k (T-section & p-section) Low Pass Filters for given cut-off frequency f_c=2000 Hz and design impedance R_o = 400O.
   2. What are the advantages and disadvantages of both constant-k and m-derived filters?

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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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