Question 1

In the circuit shown, the power supplied by the voltage source is

0W
5W
10W
100W

Answer

Correct Option: A

Question 2

The current flowing through the resistance R in the circuit in figure has the form P cos 4t, where P is

(0.18 + j0.72)
(0.46 + j1.90)
-(0.18 + j1.90)
-(0.192 + j0.144)

Answer

Correct Option: A

Question 3

In the circuit shown below, the initial charge on the capacitor is 2.5 mC, with the voltage polarity as indicated. The switch is closed at time t = 0. The current i(t) at a time t after the switch is closed is

i(t) = 15exp (- 2 x 10³t) A
i(t) = 5exp (- 2 x 10³t) A
i(t) = 10exp (- 2 x 10³t) A
i(t) = 20exp (- 2 x 10³t) A

Answer

Correct Option: A

Question 4

The following series if RLC circuit with zero conditions is excited by a unit impulse. For t > 0, the output voltage v_c (t) is

^{$\dfrac{2}{\sqrt 3}
\left(
e^{\dfrac{-t}{2}t} - e^{\dfrac{\sqrt 3}{2}t}
\right)
$}V
^{$\dfrac{2}{\sqrt 3} te^{\dfrac{-1}{2}t}$}V
^{$\dfrac{2}{\sqrt 3}
e^{\dfrac{-t}{2}t}
cos
\left(
\dfrac{\sqrt 3}{2}t
\right)
$}V
^{$\dfrac{2}{\sqrt 3}
e^{\dfrac{-t}{2}t}
sin
\left(
\dfrac{\sqrt 3}{2}t
\right)
$}V

Answer

Correct Option: D

Question 5

The switch in the circuit shown was on position for a long time, and is move to position b at time t = 0. The current i (t) for t > 0 is given by

0.2 $e^{-125t}$u (t) mA
20$e^{-1250t}$u (t) mA
0.2$e^{-1250t}$u (t) mA
20$e^{-1000t}$u (t) mA

Answer

Correct Option: B

Question 6

The h parameters of the circuit shown in figure are

$\left[ \begin{array} \ 0.1 & 0.1 \\ -0.1 & 0.3 \end{array} \right]$
$\left[ \begin{array} \ 10 & -1 \\ 1 & 0.05 \end{array} \right]$
$\left[ \begin{array} \ 30 & 20 \\ 20 & 20 \end{array} \right]$
$\left[ \begin{array} \ 10 & 1 \\ -1 & 0.05 \end{array} \right]$

Answer

Correct Option: D

Question 7

The following series if RLC circuit with zero conditions is excited by a unit impulse. For t > 0, the voltage across the resistor is

$\dfrac{1}{\sqrt 3} \left( e^{\dfrac{\sqrt 3}{2}} - e^{-\dfrac{1}{2}t} \right) $ V
$e^{\dfrac{1}{2}t} \left[ cos(\dfrac{\sqrt 3}{2}t) - \dfrac{1}{\sqrt 3}sin(\dfrac{\sqrt 3 t}{2}) \right] $ V
$\dfrac{2}{\sqrt 3} e^{\dfrac{-1}{2}} sin \left( \dfrac{\sqrt 3}{2}t \right) $ V
$\dfrac{2}{\sqrt 3} e^{\dfrac{-1}{2}} cos \left( \dfrac{\sqrt 3}{2}t \right) $ V

Answer

Correct Option: B

Question 8

A fully charged mobile phone with a 12 V battery is good for a 10 minute talk-time. Assume that during the talk-time, the battery delivers a constant current of 2 A and its voltage drops linearly from 12 V to 10 V as shown in the figure. How much energy does the battery deliver during this talk-time?

220 J
12 kJ
13.2 kJ
14.4 J

Answer

Correct Option: C

Question 9

In the circuit shown below, the current I is equal to

14 0؛A
2.0 0ºA
2.8 0ºA
3.2 0ºA

Answer

Correct Option: B

Question 10

In a series RLC circuit, R = 2k$\Omega$, L = 1H, and C = $\dfrac{1}{400} \mu F$. The resonant frequency is

$2 \times 10^4 Hz$
$\dfrac{1}{\pi} \times 10^4 Hz$
$10^4 Hz$
$2\pi \times 10^4 Hz$

Answer

Correct Option: B

Question 11

A source of angular frequency 1 rad/sec has a source impedance consisting of 1 $\Omega$resistance in series with 1 H inductance. The load that will obtain the maximum power transfer is

1 $\Omega$resistance
1 $\Omega$resistance in parallel with 1 H inductance
1 $\Omega$resistance in series with 1 F capacitor
1 $\Omega$ resistance in parallel with 1 F capacitor

Answer

Correct Option: C

Question 12

For the R – L circuit shown in the figure, the input voltage v_i(t) = u(t). The current i(t) is

Answer

Correct Option: C

Question 13

In the circuit shown below, the Norton equivalent current in amperes with respect to the terminals P and Q is

6.4 - j4.8
6.56 - j7.87
10 + j0
16 + j0 

Answer

Correct Option: A

Question 14

In the AC network shown in the figure, the phasor voltage V_AB (in Volts) is

0
5 $\angle$30⁰
12.5 $\angle$30⁰
17 $\angle$30⁰

Answer

Correct Option: D

Question 15

A two-port network shown below is excited by external DC source. The voltage and the current are measured with voltmeters V₁, V₂ and ammeters A₁, A₂(all assumed to be ideal), as indicated

Under following conditions, the readings obtained are: (i) S₁ - open, S₂ - closed A₁ = 0, V₁ = 4.5 V, V₂ = 1.5 V, A₂ = 1 A (ii) S₁ - open, S₂ - closed A₁ = 4 A, V₁ = 6 V, V₂ = 6 V, A₂ = 0

The z-parameter matrix for this network is

$\left[ \begin{array} \ 1.5 & 1.5 \\ 4.5 & 1.5 \end{array} \right] $
$\left[ \begin{array} \ 1.5 & 4.5 \\ 1.5 & 4.5 \end{array} \right] $
$\left[ \begin{array} \ 1.5 & 4.5 \\ 1.5 & 1.5 \end{array} \right] $
$\left[ \begin{array} \ 4.5 & 1.5 \\ 1.5 & 4.5 \end{array} \right] $

Answer

Correct Option: C

Question 16

A two-port network shown below is excited by external DC source. The voltage and the current are measured with voltmeters V₁, V₂ and ammeters A₁, A₂(all assumed to be ideal), as indicated

Under following conditions, the readings obtained are: (i) S₁ - open, S₂ - closed A₁ = 0, V₁ = 4.5 V, V₂ = 1.5 V, A₂ = 1 A (ii) S₁ - open, S₂ - closed A₁ = 4 A, V₁ = 6 V, V₂ = 6 V, A₂ = 0

The h-parameter matrix for this network is

$\left[ \begin{array} \ -3 & 3 \\ -1 & 0.67 \end{array} \right] $
$\left[ \begin{array} \ -3 & -1 \\ 3 & 0.67 \end{array} \right] $
$\left[ \begin{array} \ 3 & 3 \\ 1 & 0.67 \end{array} \right] $
$\left[ \begin{array} \ 3 & 1 \\ -3 & -0.67 \end{array} \right] $

Answer

Correct Option: A

Question 17

In the two port network shown in the figure below, z₁₂ and z₂₁ are, respectively

r_c and$\beta$r₀
0 and −$\beta$r₀
0 and $\beta$r₀
r_c and −$\beta$ r₀

Answer

Correct Option: B

Question 18

The circuit shown in the figure has initial current i_L (0^-) = 1 A through the inductor and an initial voltage v_C(0^-) = -1 V across the capacitor. For input = v(t) = u (t), the Laplace transform of the current i(t) for t $\ge$0 is

$\dfrac{s}{s^2+s+1}$
$\dfrac{s+2}{s^2+s+1}$
$\dfrac{s-2}{s^2+s+1}$
$\dfrac{1}{s^2+s+1}$

Answer

Correct Option: B

Question 19

A negative resistance R_neg is connected to a passive network N having driving point impedance Z₂(s) as shown below. For Z₁(s) to be positive real,

|R_neg| $\le$ Re Z₁ (j$\omega$), $\forall \omega$
|R_neg| $\le$ | Z₁ (j$\omega$), $\forall \omega$
|R_neg| $\le$ | ImZ₁ (j$\omega$), $\forall \omega$
|R_neg| $\le$ $\angle$ Z₁ (j$\omega$), $\forall \omega$

Answer

Correct Option: A

Question 20

An AC source of RMS voltage 20 V with internal impedance Z_s = (1 + 2j) ^_$\Omega$feeds a load of impedance Z_L = (7 + 4j) ^_$\Omega$ in the figure below. The reactive power consumed by the load is

8 VAR
16 VAR
28 VAR
32 VAR

Answer

Correct Option: B

Description: A test for Network Graphs of Electronics and Communication (ECE)
Number of Questions: 20
Created by: Yashbeer Singh
Tags: Network Graphs Coding Decoding Coding-Decoding Visual Reasoning Non-Verbal Reasoning Insert the Missing Number/Character Inserting the Missing Character

Test 2 - Network Graphs | Electronics and Communication (ECE)

Find more quizzes from top tags