ECE - Practice Test - 30

Q1:

Consider the following standard symbols for two-port parameters:

1. h₁₂ and h₂₁ are dimensionless.

2. h₁₁ and B have dimensions of ohms.

3. BC is dimensionless.

4. C is dimensionless.

Which of the above are correct?

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

1 , 2 and 3 only

1 , 2 and 4 only

3 and 4 only

1, 2, 3 and 4

Q2:

The lattice circuit has the following impedances Z_A = 3 + j4, Z_B = 3 – j4. Then the Z-parameters would be

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

$[\begin{matrix} 3 + j 4 & 0 \\ 0 & 3 - j 4 \end{matrix}]$

$[\begin{matrix} 3 & - j 4 \\ - j 4 & 3 \end{matrix}]$

$[\begin{matrix} 3 + j 4 & 3 \\ 3 & 3 + j 4 \end{matrix}]$

$[\begin{matrix} - j 4 & 3 \\ 3 & + j 4 \end{matrix}]$

Q3:

The [y] parameters of the network given below, are given by

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

$[\begin{matrix} R_{1}^{- 1} & R_{1}^{- 1} \\ R_{1}^{- 1} & R_{1}^{- 1} \end{matrix}]$

$[\begin{matrix} 0 & R_{1}^{- 1} \\ R_{1}^{- 1} & R_{1}^{- 1} \end{matrix}]$

$[\begin{matrix} R_{1}^{- 1} & 0 \\ 0 & 0 \end{matrix}]$

$[\begin{matrix} R_{1}^{- 1} & 0 \\ R_{1}^{- 1} & 0 \end{matrix}]$

Q4:

For the given 2-port network, the value of transfer impedance Z₂₁ in ohms is ………... .

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

$2 Ω$

$3 Ω$

$4 Ω$

$5 Ω$

Q5:

Consider the two-port network as shown. The hybrid parameter h₁₂ is

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

$- \frac{(α R_{3} + R_{2})}{R_{2} + R_{3}}$

$\frac{(1 - α) R_{3}}{R_{2} + R_{3}}$

$\frac{(1 - α) R_{2}}{R_{2} + R_{3}}$

$\frac{R_{2}}{R_{2} + R_{3}}$

Q6:

For the 2-port network as shown below, what is the value of Y₂₁ parameter?

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

Y₁ + Y₃

g_m – Y₂

g_m – Y₃

Y₁ + Y₂ + g_m

Q7:

The two-port network P shown in the figure has port 1 and 2, denoted by terminals (a, b) and (c, d), respectively. It has an impedance matrix Z with parameters denoted by Z_ij. A $1 Ω$ resistor is connected in series with the network at port 1 as shown in the figure. The impedance matrix of the modified two-port network (shown as a dashed box) is

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

$(\begin{matrix} Z_{11} + 1 & Z_{12} + 1 \\ Z_{21} & Z_{22} + 1 \end{matrix})$

$(\begin{matrix} Z_{11} + 1 & Z_{12} \\ Z_{21} & Z_{22} + 1 \end{matrix})$

$(\begin{matrix} Z_{11} + 1 & Z_{12} \\ Z_{21} & Z_{22} \end{matrix})$

$(\begin{matrix} Z_{11} + 1 & Z_{12} \\ Z_{21} + 1 & Z_{22} \end{matrix})$

Q8:

For the two-port network as shown below, Y₁₂ is equal to

Tags:

PlaceMe2_NW5

NEAT_NW5

Baseline3_ECE_2Yr

Section:

Network Theory

Options:

Y_A + Y_B

$Y_{C} + (\frac{Y_{A} Y_{B}}{Y_{A} + Y_{B}})$

– Y_C

Y_C

Q9:

The [y] parameters of the network given below, are given by

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

$[\begin{matrix} R_{1}^{- 1} & R_{1}^{- 1} \\ R_{1}^{- 1} & R_{1}^{- 1} \end{matrix}]$

$[\begin{matrix} 0 & R_{1}^{- 1} \\ R_{1}^{- 1} & R_{1}^{- 1} \end{matrix}]$

$[\begin{matrix} R_{1}^{- 1} & 0 \\ 0 & 0 \end{matrix}]$

$[\begin{matrix} R_{1}^{- 1} & 0 \\ R_{1}^{- 1} & 0 \end{matrix}]$

Q10:

A two-port network is defined by the relation:

I₁ = 5 V₁ + 3 V₂

I₂ = 2 V₁ – 7 V₂

The value of Z₁₂ is

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

$3 Ω$

$- 3 Ω$

$3 / 41 Ω$

$2 / 31 Ω$

Q11:

The terminal voltage and currents of a two-port network are indicated on the below figure. If the two-port is reciprocal, then

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

$\frac{Z_{12}}{Y_{12}} = Z_{12}^{2} - Z_{11} . Z_{22}$

$Z_{12} = \frac{1}{Y_{22}}$

$h_{12} = - h_{21}$

$A D - B C = 0$

Q12:

A, B, C and D represent the transmission parameters of a two-port network. When is the network reciprocal?

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

AB – CD = 1

AD – BC = 1

AB – CD = 0

AD – BC = 0

Q13:

A passive two-port network is in a steady state. Compared to its input, the steady state output can never offer

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

Higher voltage

Lower impedance

Greater power

Better regulation

Q14:

A two-port device is defined by the following pair of equations:

$i_{1} = 2 V_{1} + V_{2} a n d i_{2} = V_{1} + V_{2}$

Its impedance parameters $(\begin{matrix} Z_{11} & Z_{12} \\ Z_{21} & Z_{22} \end{matrix})$ are given by

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

$(\begin{matrix} 2 & 1 \\ 1 & 1 \end{matrix})$

$(\begin{matrix} 1 & - 1 \\ - 1 & 2 \end{matrix})$

$(\begin{matrix} 1 & 1 \\ 1 & 2 \end{matrix})$

$(\begin{matrix} 2 & - 1 \\ - 1 & 1 \end{matrix})$

Q15:

If a two-port network is reciprocal, then we have, with the usual notation, the following relationship

Tags:

PlaceMe2_NW5

NEAT_NW5

Section:

Network Theory

Options:

h₁₂ = h₂₁

h₁₂ = –h₂₁

h₁₁ = h₂₂

h₁₁ h₂₂ – h₁₂ h₂₁ = 1