How well a target backscatters radar depends on _______

A)
Speed of the object
B)
Heat signature of the object
C)
Power of radar
D)
The objects RCS

Correct Answer :   The objects RCS

Explanation : When radar pulse strikes the aircraft some radio pass through the object whereas some get reflected back. The amount of radio energy that gets reflected back depends upon the Radar cross section of the aircraft. RCS depends on size, material on the surface of the aircraft and many more parameters.

Recently Updated in Avionics Questions
What is the range of typical weather radar?
A)
5 nmi
B)
50 nmi
C)
200 nmi
D)
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?
A)
500 kHz
B)
548 kHz
C)
1000 MHz
D)
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?
A)
5 dB
B)
25 dB
C)
50 dB
D)
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.

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