Pulse Code Modulation MCQ’s

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This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Pulse Code Modulation”.

1. Which of the following statements is true with respect to PCM?
a) The parallel binary data is converted into serial before transmission
b) Analog data is transmitted directly
c) Analog signal is amplified before transmission
d) The analog signal is converted into parallel binary data before transmission

2. Which of the following is false with respect to PCM?
a) Reliable
b) Inexpensive
c) Resistant to noise
d) Not easily recoverable

3. Which of the following type of multiplexing uses pulse code modulation?
a) Frequency division multiplexing
b) Time division multiplexing
c) Code division multiplexing
d) Amplitude limited multiplexing

4. A special PCM system uses 16 channels of data, one whose purpose is identification (ID) and synchronization. Find (a) the number of available data channels.
a) 15
b) 16
c) 14
d) 18

5. 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) 326kHz
c) 152kHz
d) 336kHz

6. In a TDD one channel is sufficient for transmission.
a) True
b) False

7. A special PCM system uses 16 channels of data, one whose purpose is an identification (ID) and synchronization. The word length is 6 bits. Find the number of bits per frame.
a) 94
b) 95
c) 96
d) 125

8. All local and long-distance connections are digital.
a) True
b) False

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