The strength of a secondary radar varies inversely with distance to the ______ power.

Zeroth

Second

Fourth

Eighth

Correct Answer : Second

Explanation : In the secondary radar, the strength of the communication system varies inversely with distance to the second power, compared with primary radar which reduced with the fourth power.

Recently Updated in Avionics Questions

What is the range of typical weather radar?

5 nmi

50 nmi

200 nmi

500 nmi

Correct Answer : Option (C) : 200 nmi

Explanation : 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.

What is the frequency of operation of weather radar?

500 kHz

548 kHz

1000 MHz

9375 MHz

Correct Answer : Option (D) : 9375 MHz

Explanation : 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.

What is the gain required by a weather radar antenna?

5 dB

25 dB

50 dB

65 dB

Correct Answer : Option (B) : 25 dB

Explanation : 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.