The factor by which a receiver fails to reach the theoretical internal noise limit is known as ________ - Avionics MCQ

Aeronautical & Aerospace Engineering : Avionics - Quiz(MCQ)

The factor by which a receiver fails to reach the theoretical internal noise limit is known as ________

A)

Noise

B)

Noise factor

C)

Noise figure

D)

Coefficient of noise

Correct Answer : Noise figure

Explanation : The factor by which a receiver fails to reach the theoretical internal noise limit is often expressed as a ratio, in decibels, and is known as the noise figure. It can also be described as the ratio between the noise power output of a practical receiver and the noise power output of an ideal receiver.

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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