In amplitude modulation, which of the following varies?

Aeronautical & Aerospace Engineering : Avionics - Quiz(MCQ)

Frequency of the carrier

Frequency of the information signal

Amplitude of the information signal

Amplitude of the carrier wave

Correct Answer : Amplitude of the carrier wave

Explanation : In amplitude modulation, the amplitude of the carrier wave is modulated with respect to the information signal. The frequency and the phase of both the carrier and the information signal remain constant.

Recently Updated in Avionics Questions

The maximum peaks of an electromagnetic wave are separated by a distance of 8 in. What is the frequency?

256.4Khz

256.7Mhz

1477.8Khz

1477.8Mhz

Correct Answer : Option (D) : 1477.8Mhz

Explanation : Wavelength =8 in.= 0.203 m
Frequency = 300/0.203 = 1477.8Mhz.

SHF Em waves are used in?

Underwater communication

Satellite communication

Aircraft to ATC communication

Ground to ground communication

Correct Answer : Option (B) : Satellite communication

Explanation : SHFs or Super High Frequency EM waves are those which lie between the frequency range of 3 to 30GHz range. These microwaves frequencies are widely used in satellite communication and radar.

Which one of the following is not a source of infrared radiation?

Sun

Books

Light bulbs

Human bodies

Correct Answer : Option (B) : Books

Explanation : Infrared radiation is generally associated with heat. Infrared is produced by light bulbs, human bodies, and basically any physical equipment that generates heat.