# Dielectric constant is

1.  1.634

2.  1.234

3.  0.936

4.  0.548

4

0.548

Explanation :
No Explanation available for this question

# The beam width-between first null of uniform linear army of N equally-spaced (element spacing = d) equally excited antenna is determined by

1.  N along and not by d

2.  d along and not by N

3.  the product (Nd)

4.  the ratio (N/d)

4

the product (Nd)

Explanation :
No Explanation available for this question

# A parabolic dish antenna has a conical beam ' wide. The directivity of the antenna is approximately

1.  22.9dB

2.  30 dB

3.  40 dB

4.  50 dB

4

22.9dB

Explanation :
No Explanation available for this question

# A radio wave is incident on a layer of Ionosphere at an 30 degree with the vertical if the critical frequency is 1.2 MHz. The maximum usable frequency is

1.  1.2MHz

2.  2.4MHz

3.  0.6MHz

4.   1.386MHz

4

1.386MHz

Explanation :
No Explanation available for this question

# In a broad side array of 20 Isotropic radiators, equally spaced at a distance of λ/2 the beam width between first null is

1.  51.3 degree

2.  11.4 degree

3.  102.6 degree

4.  22.9 degree

4

11.4 degree

Explanation :
No Explanation available for this question

# The akin depth at 10 MHz for a conductor is 2cm. The phase velocity of on electromagnetic wave in the conductor at 1,000 MHz. about

1.  6 ×106 m/see

2.  6 ×10-7m/sec

3.  6×108m/sec

4.  6 ×10-8m/sec

4

6 ×106 m/see

Explanation :
No Explanation available for this question

# If velocity factor is 1.0 for antenna conductors, then length of λ/2 dipole antenna used to receive a 5 MHz radio signal

1.  25m

2.  30m

3.  40m

4.  35m

4

30m

Explanation :
No Explanation available for this question

# Optimum length of a macroni antenna for transmission of a 100 MHz signal with velocity factor 0.90 will be

1.  0.475 m

2.  0.575 m

3.  0.675 m

4.  0.775 m

4

0.675 m

Explanation :
No Explanation available for this question

# SWRs is

1.  2

2.  1

3.  1/2

4.  none of these

4

2

Explanation :
No Explanation available for this question

1.  2/3

2.  4/3

3.  1/3

4.  3

4