Practice MCQ Questions and answers on Avionics Mcqs

TCAS I provide only proximity warning and aids the pilot in visual identification of potential threat aircraft.

TCAS uses two different methods to avoid garbling. One is whisper shout and the other is using directional interrogations.

The use of airborne weather radar is one method of storm avoidance. A weather radar system can show centers at a distance of up to 200 nmi.

The weather radar operates at a frequency of 9375 MHz, corresponding to a wavelength of 3 cm. This small wavelength gets easily reflected from clouds containing high water concentrations.

The signal strength of echoes from storms located at a distance from the aircraft is very low, which requires the transmitter to operate at very high power levels and that the antenna have a gain of more than 25 dB.

Even with narrow beamwidth antennas, the radar transmitter requires from 5kW to 50kW of output power. When coupled with an antenna of 25 dB, this combination can result in an effective power more than a million watts.

With radar system operating in excess of 5kW output, the minimum safe approach distance to weather radar is about 4ft.