Network Theory  Electronic Engineering (MCQ) questions & answers
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1) If zparameters are z_{11} = 40, z_{22} = 50 and z_{12} = z_{21} = 20, what would be the value of y_{22} in the matrix form of yparameters given below?  Published on 07 Oct 15
a. 4 / 160
b. 5 / 160
c. 10 / 160
d. 15 / 150

2) If the two ports are connected in cascade configuration, then which arithmetic operation should be performed between the individual transmission parameters in order to determine overall transmission parameters?  Published on 07 Oct 15
a. Addition
b. Subtraction
c. Multiplication
d. Division

3) Which among the following represents the precise condition of reciprocity for transmission parameters?  Published on 07 Oct 15
a. AB  CD = 1
b. AD – BC = 1
c. AC – BD = 1
d. None of the above

4) Which is the correct condition of symmetry observed in zparameters?  Published on 07 Oct 15
a. z_{11} = z_{22}
b. z_{11} = z_{12}
c. z_{12} = z_{22}
d. z_{12} = z_{21}

5) An open circuit reverse voltage gain in hparameters is a unitless quantity and generally equivalent to ________  Published on 07 Oct 15
a. V_{1} / I_{1} (keeping V_{2} = 0)
b. I_{2} / I_{1} (keeping V_{2} = 0)
c. V_{1} / V_{2} (keeping I_{1} = 0)
d. I_{2} / V_{2} (keeping I_{1} = 0)

6) How is the short circuit reverse transfer admittance (y_{12}) calculated in terms of current and voltage ratio?  Published on 07 Oct 15
a. V_{2}/ I_{1} (keeping I_{2} = 0)
b. I_{2}/ V_{1} (keeping V_{2} = 0)
c. I_{1}/ V_{2} (keeping V_{1} = 0)
d. V_{1}/ I_{2} (keeping I_{1} = 0)

7) Which among the below mentioned cases are responsible for generating the oscillations with increasing amplitude in time domain response of system function?
A. Complex poles with positive real part B. Complex poles with negative real part C. Repeated poles on imaginary axis D. Repeated poles on real axis  Published on 07 Oct 15
a. A & C
b. B & D
c. B & C
d. A & D

8) Which oscillations will be generated in the time domain response, if complex conjugate poles are present with negative real part?  Published on 07 Oct 15
a. Damped oscillations
b. Undamped oscillations
c. Sustained oscillations
d. None of the above

9) For the polezero plot given below, what would be the value of system function H(s), if the d.c. gain of the system is 20?  Published on 07 Oct 15
a. 10 (s + 4) / (s + 1) (s^{2} + 6s  10)
b. 20 (s  4) / (s + 3) (s^{2} _ 6s +10)
c. 40 (s + 4) / (s + 3) (s^{2}  6s  10)
d. 50 (s + 4) / (s + 1) (s^{2} + 6s +10)

10) What would be the value of i(t) especially for t > 0 in the RC circuit shown below? [Assume that the polarities of v_{c} (0^{}) are similar to the drop across capacitor due to i(t)]  Published on 07 Oct 15
a. 2.125 e^{1t} A
b. 4.125 e^{2t} A
c. 8 e^{4t} A
d. 10 e^{5t} A
