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Network Theory

Total questions: 20

Worksheet time: 18mins

Name
Class
Date
1.

What is the transfer impedance of the two-port network shown in Fig. 1?

a)

1 Ω\Omega

b)

2 Ω\Omega

c)

3 Ω\Omega

2.

A two-port network is simply a network inside a black box, and the network has only

a)

two terminals

b)

two pairs of accessible terminals

c)

two pars of ports

3.

A two-port network is defined by the relations  I1=2V1+V2I_1=2V_1+V_2  ,  I2=2V1+3V2I_2=2V_1+3V_2  . Then  Z12Z_{12}  is

a)

-2 Ω\Omega

b)

-1 Ω\Omega

c)

12Ω-\frac{1}{2}\Omega

d)

14Ω-\frac{1}{4}\Omega

4.

For the single element two-port network in Fig, z11 is

a)

0

b)

5

c)

10

d)

20

5.

For the single element two-port network in Fig, z11 is

a)

undefined

b)

5

c)

10

d)

20

6.

When port 1 of a two-port circuit is short-circuited,

I1 = 4I2 and V2 = 0.25I2. Which of the following

is true?

a)

y11=4

b)

y12=16

c)

y21=16

d)

y22=0.25

7.

If z-parameters are z11 = 40, z22 = 50 and z12 = z21 = 20, what would be the value of y22 in the matrix form of y-parameters given below?

a)

4160\frac{4}{160}

b)

5160\frac{5}{160}

c)

10160\frac{10}{160}

d)

15160\frac{15}{160}

8.

How is the short circuit reverse transfer admittance (y12) calculated in terms of current and voltage ratio?

a)

V2/ I1 (keeping I2 = 0)

b)

I2/ V1 (keeping V2 = 0)

c)

I1/ V2 (keeping V1 = 0)

d)

V1/ I2 (keeping I1 = 0)

9.

Find [Y]?

a)
b)
c)
d)
10.

Find V1 and V2

a)

-68.6 V, 114.3 V

b)

68.6 V, -114.3 V

c)

114.3 V, -68.6 V

d)

-114.3 V, 68.6 V

11.

The Z-parameters of the two-port network are Ω which of the following represents the equivalent T network?

a)

Z1= Z2 = 1 Ω , Z3 = 1 Ω

b)

Z1= Z2 = 2 Ω , Z3 = 2 Ω

c)

Z1= Z2 = 2 Ω , Z3 = 1 Ω

d)

Z1= Z2 = 0 , Z3 = 2 Ω

12.

What is the transfer admittance of the network shown in Fig?

a)

-2 S

b)

-3 S

c)

-4 S

d)

-7S

13.

If Z11 = 2 Ω ; Z12 = 1 Ω ; Z21 = 1 Ω and Z22 = 3 Ω, what is the determinant of admittance matrix.

a)

5

b)

1/5

c)

1

d)

0.5

14.

If Z11 = 2 Ω ; Z12 = 1 Ω ; Z21 = 1 Ω and Z22 = 3 Ω, what is the determinant of admittance matrix?

a)

-2 Ω

b)

-1 Ω

c)

12Ω-\frac{1}{2}\Omega

d)

14Ω-\frac{1}{4}\Omega

15.

For the T-network is shown Fig, the Ysc matrix is (units in Siemens)

a)
b)
c)
d)
16.

The number of possible combinations generated by four variables taken two at a time in a two-port network is _____

a)

four

b)

two

c)

six

d)

three

17.

Find Z22 of the following circuit.

a)

5 Ω\Omega

b)

3 \Omega

c)

2 \Omega

d)

4 \Omega

18.

Y parameters are also called as Short circuit admittance parameters

a)

True

b)

False

19.

For a symmetrical two port network

a)

Z11=Z22 and Y12=Y21

b)

Y11=Y22 and Z12=Z21

c)

Z11=Z22 and Y11=Y22

d)

Z12=Z21 and Y12=Y21

20.

Y11 =

a)

z22ΔZ\frac{z_{22}}{\Delta Z}

b)

z11Δz\frac{z_{11}}{\Delta z}

c)

z22Δz-\frac{z_{22}}{\Delta z}

d)

z11Δz-\frac{z_{11}}{\Delta z}