Correct Answer : Option (D) : super heterodyne receivers
Explanation : Now-a-days only super heterodyne radio receivers are used.
Correct Answer : left to right
Correct Answer : Fading
Explanation : Tropospheric scatter propagation is subject to two types of fading called Rayleigh fading (due to multipath propagation) and fading due to variations in atmospheric conditions along the propagation path.
Correct Answer : 13 mm