Correct Answer : Option (A) : tuning
Explanation : In varactor diode the applied reverse bias controls the width and therefore capacitance of depletion layer.This capacitance is used for tuning.
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