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Digital and Analog Modulation Basics
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Digital and Analog Modulation Basics
Digital and Analog Modulation Basics
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1
Question
What do Mark and space refer to in the context of modulation?
Answer
Mark = 1, Space = 0
2
Question
Which option correctly pairs terms for binary signaling?
Answer
Binary 1 and binary 0
3
Question
What does QAM combine in modulation schemes?
Answer
ASK and PSK
4
Question
Which modulation physically maps to amplitude versus phase changes?
Answer
Amplitude and phase variations (AM and PM/PSK)
5
Question
What is the common method to encode data for transmission by modulating a carrier?
Answer
Modulation
6
Question
How many bits does the ASCII code typically use in standard charset?
Answer
7 or 8 bits (depending on convention)
7
Question
Which term refers to the technique of using modulation for multiple data channels on a common medium?
Answer
Multiplexing (multiplexed transmission)
8
Question
What is the most widely used data communication code in the list?
Answer
ASCII
9
Question
What is the technique of using modulation and FDM to transmit multiple data channels called?
Answer
Broadband transmission
10
Question
Which coding style is most widely used for data communications?
Answer
ASCII coding
11
Question
Which modulation method is indicated by slower modems using digital modulation?
Answer
Binary phase modulation (BPSK) or basic digital modulation
12
Question
The Baudot code uses how many bits per symbol?
Answer
5 bits per symbol
13
Question
Which term refers to using the same line to send digital data alongside analog signals?
Answer
Baseband transmission
14
Question
What is the vocabulary term for signaling by the ends of a link to ensure correct data transfer?
Answer
Handshaking
15
Question
Which statement defines the use of a multi-channel medium for data transmission?
Answer
A broadband transmission medium is used for multiple channels
16
Question
What does PCM stand for in digital communications?
Answer
Pulse Code Modulation
17
Question
Which modulation technique is used for slow-speed modems among the options?
Answer
PSK or QPSK depending on context (commonly BPSK/QPSK)
18
Question
Who developed the fixed-length binary code for telegraphy?
Answer
Emile Baudot
19
Question
Who invented pulse-code modulation for the digital encoding of speech signals?
Answer
J.R. Carson
20
Question
Which option correctly states the meaning of ‘pulse-code modulation’?
Answer
Digital encoding of analog signals
21
Question
In a typical multiplexing scheme for baseband transmission, which is correct?
Answer
TDM (Time Division Multiplexing)
22
Question
Data means what kind of information?
Answer
Digital information
23
Question
What does parallel transmission involve?
Answer
Sending multiple bits simultaneously
24
Question
What is the maximum rate at which information can be transmitted through a channel called?
Answer
Channel capacity
25
Question
What does baud rate measure in a communication system?
Answer
Symbol rate (symbols per second)
26
Question
What is the term for the rate of data transfer in bits per second?
Answer
Bit rate
27
Question
Which of the following can be used to represent where data goes in a network?
Answer
Handshake or handshaking process
28
Question
What is the purpose of using ASCII in digital communications?
Answer
Standard character encoding for text
29
Question
Which modulation system is used in telephony?
Answer
Analog transmission (and PCM for digital voice)
30
Question
PCM systems require what primary operation on analog signals?
Answer
Quantization