Frequency division multiplexing:Frequency slots::time division multiplexing:? - Avionics MCQ

Aeronautical & Aerospace Engineering : Avionics - Quiz(MCQ)

Frequency division multiplexing:Frequency slots::time division multiplexing:?

A)

Band slots

B)

Coded information

C)

Time slots

D)

Pulsed information

Correct Answer : Time slots

Explanation : In FDM, multiple signals are transmitted over a single channel, each signal being allocated a portion of the spectrum within that bandwidth. In time-division multiplexing (TDM), each signal occupies the entire bandwidth of the channel. However, each signal is transmitted for only a brief time. In other words, multiple signals take turns transmitting over the single channel.

Recently Updated in Avionics Questions

A special PCM system uses 16 channels of data, one whose purpose is an identification (ID) and synchronization. The sampling rate is 3.5 kHz. The word length is 6 bits. Find the serial data rate.

A)

451kHz

B)

336kHz

C)

326kHz

D)

152kHz

Correct Answer : Option (B) : 336kHz

Explaination : Serial data rate = sampling rate x no. bits/frame = 3.5 kHz x 96 = 336 kHz.

Which of the following is false with respect to PCM?

A)

Reliable

B)

Inexpensive

C)

Resistant to noise

D)

Not easily recoverable

Correct Answer : Option (D) : Not easily recoverable

Explanation : When signals have been degraded because of noise, attenuation, or distortion, all the receiver has to do is to determine whether a pulse was transmitted. Amplitude, width, frequency, phase shape, and so on do not affect reception. Thus PCM signals are easily recovered and rejuvenated, no matter what the circumstances.

Which of the following statements is true with respect to PCM?

A)

Analog data is transmitted directly

B)

Analog signal is amplified before transmission

C)

The parallel binary data is converted into serial before transmission

D)

The analog signal is converted into parallel binary data before transmission

Correct Answer : Option (C) : The parallel binary data is converted into serial before transmission

Explanation : The analog signal is converted into a digital signal. Since the converted digital signal is parallel bits of data, it has to be converted to serial before it can be multiplexed and transmitted.

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