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QUESTION: 1

Assertion (A) : Smith chart is designed for λ/2length only.

Reason (R) : For every λ/2 length, the load impedance appears to be same as Z_{in}.

Solution:

QUESTION: 2

Stub matching is used to match the load to characteristic impedance. Stub should be placed such that the admittance value at that point is

Solution:

Stub matching is an effective technique in order to cancel out the reflectors when placed such that its reactive admittance value at the location of the stub is '0'. [Then it minimize losses]

QUESTION: 3

Match the following

Solution:

QUESTION: 4

The characteristic impedance of a lossless transmission line at is _________________ (ohms)

Solution:

QUESTION: 5

Assertion (A) : Magnetic field is continuous and always rotational.

Reason (R) :

Solution:

So assertion and reason both are correct and reason is the correct explanation for assertion.

QUESTION: 6

An electric wave propagating through a lossless medium is given by :the phase constant β is given by

Solution:

QUESTION: 7

Assertion (A) : Polarization is always defined in terms of electric field orientation.

Reason (R) : Magnetic field is due to induced effect of electric field so we cannot measure it directly.

Solution:

Assertion and reason are correct and reason is the correct explanation for assertion

QUESTION: 8

Consider a wave which is having a phase velocity of 3x10^{8}m/s .Find the group ✓elocitv and the medium in which it is travelling

Solution:

QUESTION: 9

Phase difference between E and H in a high loss medium is _______________ (Degrees)

Solution:

QUESTION: 10

On the smith chart the location of the normalized load point is at 0.15λ, with reference to wavelength towards generator (WTG), scale operating wavelength is 4 cm. The location of first v_{max} from load is

Solution:

QUESTION: 11

Which of the following statements on a smith chart are correct?

1. Moving in clockwise direction is analogous to moving towards generator.

2. VSWR circles can be plotted on a smith chart.

3. Smith chart is the superposition of locus of VSWR and reflection coefficients.

4. To complete a distance of 0.75λ. it's enough to move 0.5λ. towards aenerator.

Solution:

Smith chart is superposition of locus of resistance and reactance circles.

QUESTION: 12

S-matrix for two port transmission line is given by . The reflection

coefficient and the transmission power through port 1 for input power of 5 mW is

Solution:

QUESTION: 13

Match the following

Solution:

QUESTION: 14

For a waveguide component whose VSWR is 1.4 when the component is terminated with a matched load. The power to the matched load is 25 mW for an input power of 100 mW. The same results are obtained when component is reversed, then the S-matrix is

Solution:

QUESTION: 15

The propagation constant of a transmission line with impedance and admittance of 9 and 16 respectively is

Solution:

The propagation constant is given by γ = √(ZY), where Z is given by 9 and Y is 16. On substituting the given values, the propagation constant will be γ = √(ZY) = √(9 x 16) = 12 units.

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