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Free download in PDF Digital Modulation Techniques MCQs and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
81
The process of converting the analog sample into discrete form is called
[A]
Quantization
[B]
Sampling
[C]
Multiplexing
[D]
Modulation
82
The characteristics of compressor in μ-law companding are
[A]
Continuous in nature
[B]
Logarithmic in nature
[C]
Linear in nature
[D]
Discrete in nature
Answer: Continuous in nature
83
The modulation techniques used to convert analog signal into digital signal are
[A]
Pulse code modulation
[B]
Adaptive delta modulation
[C]
Delta modulation
[D]
All of the above
84
The sequence of operations in which PCM is done is
[A]
Sampling, quantizing, encoding
[B]
Quantizing, encoding, sampling
[C]
Quantizing, sampling, encoding
[D]
None of the above
Answer: Sampling, quantizing, encoding
85
QAM uses ______ as the dimensions.
[A]
In phase & Quadrature
[B]
Quadrature
[C]
In phase
[D]
None of the mentioned
Answer: In phase & Quadrature
86
Which has same probability of error?
[A]
BPSK and QPSK
[B]
BPSK and ASK
[C]
BPSK and PAM
[D]
BPSK and QAM
87
Which system uses QAM?
[A]
Dial up modem
[B]
Digital microwave relay
[C]
Peak value/ rms value
[D]
None of the mentioned
Answer: Digital microwave relay & Dial up modem
88
Average energy per bit is given by
[A]
average energy symbol/log2 M
[B]
log2 M/ Average energy symbol
[C]
average energy symbol * log2 M
[D]
none of the mentioned
Answer: average energy symbol/log2 M
89
Which FSK has no phase discontinuity?
[A]
Uniform FSK
[B]
Discrete FSK
[C]
Continuous FSK
[D]
None of the mentioned
90
FSK reception is
[A]
Phase Coherent & non coherent
[B]
Phase non coherent
[C]
Phase Coherent
[D]
None of the mentioned
Answer: Phase Coherent & non coherent
91
Every frequency has ____ orthogonal functions.
[A]
One
[B]
Two
[C]
Four
[D]
Six
92
Equalization in digital communication
[A]
Is done using linear filters
[B]
Removes distortion caused due to channel
[C]
Reduces inter symbol interference
[D]
All of the above
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