Electronics and Communication Engineering - Electromagnetic Field Theory

36. 

A wavelength of 1 mm could be expected in

A. VLF
B. HF
C. EHF
D. SHF

Answer: Option C

Explanation:

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37. 

The numerical value of directivity of current element of half-wave dipole is 1.76 and 2.15 dB respectively. The directive gain of half-wave dipole over current element will be

A. 3.91 dB
B. 1.95 dB
C. 0.39 dB
D. 0.195 dB

Answer: Option C

Explanation:

2.15 - 1.76 = 0.39 db.


38. 

The maximum effective aperture of an antenna which is operating at wavelength of 2 m and has directivity of 100 is

A. 15.92
B. 31.84
C. 2.18
D. 3.184

Answer: Option D

Explanation:


39. 

The waveguides compared to equivalent transmission lines at low frequency are

A. able to carry more power
B. less noisy
C. having lower attenuation
D. all of the above

Answer: Option D

Explanation:

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40. 

The current distribution of a half wave dipole is

A. uniform
B. sinusoidal
C. triangular
D. complex

Answer: Option B

Explanation:

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