An amplitude modulated signal is given by:
S(t) = 10cos(2π × 10⁶t) + 5cos(2π × 10⁶t)cos(2π × 10³t) + 2cos(2π × 10⁶t)cos(4π × 10³t)
The effective modulation index is:

Skip distance depends on time of day and angle of incidence.

A. True

B. False

It is found that a ship to ship communication suffers from fading. This can be avoided by using

A. Space diversity

B. Frequency diversity

C. Broad band antenna

D. Directional antenna

A buffer amplifier is

A. A double-tuned amplifier

B. A high gain D.C. amplifier

C. A cathode follower stage

D. None of the above

SSB can be generated by

A. Filter method

B. Phase cancellation method

C. Good attenuation characteristics

D. All of the above