Electronics and Communication Engineering - Electromagnetic Field Theory

21.
An antenna is synonymous to a
generator
transformer
regulator
reflector
Answer: Option
Explanation:
No answer description is available. Let's discuss.

22.
Alternating current can induce voltage because it has magnetic field which is
constant
time varying
stronger field than D.C.
closed loop nature.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

23.
Which of the following frequencies cannot be used for reliable beyond-the-horizon terrestrial communications without repeaters?
25 kHz
15 MHz
750 MHz
12 GHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.

24.
Maximum effective aperture (Ae)max of short dipole antenna is
1.119 λ2
0.119 λ2
1.19 λ2
1.919 λ2
Answer: Option
Explanation:
No answer description is available. Let's discuss.

25.
Beamwidth of an antenna depends upon
shape of radiation pattern
dimensions
wavelength
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.