Time division multiplexing: Digital signal:: Frequency division multiplexing:?

A)
Analog signal
B)
Continuous wave signals
C)
Pulse code modulated signal
D)
Pulse position modulated signal

Correct Answer :   Analog signal

Explanation : The two most common types of multiplexing are frequency-division multiplexing (FDM) and time-division multiplexing (TDM). Two variations of these basic methods are frequency-division multiple access (FDMA) and time-division multiple access (TDMA). In general, FDM systems are used for analog information and TDM systems are used for digital information.

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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