When a particular mode is excited in a waveguide, there appears an extra electric component, in the direction of propagation. The resulting mode is

1.   Transverse-electric

2.  Transverse-magnetic

3.  Longitudinal

4.  Transverse-electromagnetic

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4
Correct Answer :

Transverse-magnetic


Explanation :
No Explanation available for this question

If of the polarization vector and is the direction of propagation of a plane electromagnetic wave, then

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

An antenna in free space receives 2????w of power when the incident electric field is 20 m V/m rms. The effective aperture of the antenna is

1.  0.085 m2

2.  0.05 m2

3.  1.885m2

4.  3.77 m2

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4
Correct Answer :

3.77 m2


Explanation :
No Explanation available for this question

The inner diameter of the outer conductor and the outer diameter of the inner conductor of a co-axial cable are 10 mm respectively. If the dielectric used has a dielectric constant of 4, the characteristic impedance of the co-axial cable would be

1.  138Ω

2.  69Ω

3.   50Ω

4.  72Ω

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4
Correct Answer :

69Ω


Explanation :
No Explanation available for this question

When electromagnetic waves a reflected at an angle from a wall, their wave length along the wall is

1.  The same as in free space

2.  The same as the wavelength perpendicular to the wall

3.  Shortened because of the Doppler effect

4.  Greater than in the actual direction of propagation

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4
Correct Answer :

Greater than in the actual direction of propagation


Explanation :
No Explanation available for this question

The maximum usable frequency of an ionospheric layer at 600 incidence and with 8 MHz critical frequency is

1.  16 MHz

2.  16/ √3 MHz

3.  8 MHz

4.  about 6.93 MHz

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4
Correct Answer :

16/ √3 MHz


Explanation :
No Explanation available for this question

As a result of reflection from a plane conducting wall, electromagnetic waves acquire an apparent velocity greater than the velocity of light in space. This is called the

1.  Velocity of propagation

2.  Normal velocity

3.  Group velocity

4.  Phase velocity

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4
Correct Answer :

Phase velocity


Explanation :
No Explanation available for this question

The electric field lines and equipotential lines

1.  Are parallel to each other

2.  Are one and the same

3.  Cut each other orthogonally

4.   Can be inclined to each other at any angle.

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4
Correct Answer :

Cut each other orthogonally


Explanation :
No Explanation available for this question

The waveguides belong to

1.  TEM class of transmission lines

2.  Quasi-TEM class of transmission lines

3.   Non-TEM class of transmission line

4.  None of these

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4
Correct Answer :

Non-TEM class of transmission line


Explanation :
No Explanation available for this question

A transmission line with a characteristic impedance of 300Ω is used to interconnect receiving antenna and receiver input. A reflection co-efficient of (1/3) is observed on the line. Receiver input impedance is

1.  100Ω

2.  300Ω.

3.  500Ω

4.  600 Ω

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4
Correct Answer :

500Ω


Explanation :
No Explanation available for this question
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