June 12, 2021

Bandpass Modulation Techniques MCQ’s

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This set of Digital Communications Systems Multiple Choice Questions & Answers (MCQs) focuses on “Bandpass Modulation Techniques”.

1. Antipodal signal sets are those vectors that can be illustrated as
a) Two 180 opposing vector
b) Two 90 opposing vector
c) Two 360 opposing vector
d) None of the mentioned

2. In amplitude phase keying each phase vector is separated by
a) 90
b) 0
c) 45
d) 180

3. The real part of a sinusoid carrier wave is called as
a) Inphase
b) Quadrature
c) Inphase & Quadrature
d) None of the mentioned

4. Which modulation scheme is also called as on-off keying method?
a) ASK
b) FSK
c) PSK
d) GMSK

5. Wavelength and antenna size are related as
a) λ/2
b) λ/4
c) 2λ
d) 4λ

6. The FSK signal which has a gentle shift from one frequency level to another is called as
a) Differential PSK
b) Continuous PSK
c) Differential & Continuous PSK
d) None of the mentioned

7. The detection method where carrier’s phase is given importance is called as
a) Coherent detection
b) Non coherent detection
c) Coherent detection & Non coherent detection
d) None of the mentioned

8. The transformation of the waveform into a single point in signal space is called as
a) Vector point
b) Predetection point
c) Preamplification point
d) Transformation point

9. The coherent modulation techniques are
a) PSK
b) FSK
c) ASK
d) All of the mentioned

10. The term heterodyning refers to
a) Frequency conversion
b) Frequency mixing
c) Frequency conversion & mixing
d) None of the mentioned

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