Bandpass Modulation Techniques

Digital Communications Systems

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Digital bandpass modulation techniques”.

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

2. 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

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

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

5. 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

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

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

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

10. 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

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