# 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

4

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.

4

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

4

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

4

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

4

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

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

4

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.

4

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

4

Non-TEM class of transmission line

Explanation :
No Explanation available for this question

1.  100Ω

2.  300Ω.

3.  500Ω

4.  600 Ω

4