Which of the following methods breaks the signal into finite segments to find the ASF? - Avionics MCQ

Aeronautical & Aerospace Engineering : Avionics - Quiz(MCQ)

Which of the following methods breaks the signal into finite segments to find the ASF?

A)

Bill’s method

B)

Differential method

C)

Table look up process

D)

Millington’s method

Correct Answer : Millington’s method

Explanation : In Millington’s method, the signal between the transmitter and the receiver is broken down into finite segments of different conductivity levels, based on conductivity maps. The incremental phase delay is then computed as a function of range and conductivity for each path segment summed and averaged to provide an estimate of ASF.

Recently Updated in Avionics Questions

Which of the following type is not used in an Omega system?

A)

Valley span

B)

Insulated tower

C)

Hanging tower

D)

Grounded tower

Correct Answer : Option (C) : Hanging tower

Explanation : Since the Omega stations transmit in very low frequencies, the antennas are the largest physical structures in the stations. Three types of antennas are employed in the Omega system: grounded tower, insulated tower, and the valley span.

_____ acts as a coarse tuning device for the antenna?

A)

Loop

B)

Helix

C)

Filters

D)

Amplifiers

Correct Answer : Option (B) : Helix

Explanation : The RF signal that is to be transmitted is transferred to the ‘Helix,’ a large helical coil that acts as a coarse tuning device for the antenna. The helix is equipped with separate taps for each signal frequency transmitted.

What type of transmission is used in Omega system?

A)

Phase modulated wave

B)

Continuous wave

C)

Amplitude modulated wave

D)

Frequency modulated wave

Correct Answer : Option (B) : Continuous wave

Explanation : At each Omega station, continuous wave signals on four common frequencies and one station unique frequency. The signal frequencies are time shared among the stations so that a given frequency is transmitted by only one station at any given time.

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