MCQOPTIONS
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MCQOPTIONS
This section includes 23 Mcqs, each offering curated multiple-choice questions to sharpen your Wireless Mobile Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is not a detection technique used for detection of π/4 QPSK signals? |
| A. | Baseband differential detection |
| B. | IF differential detection |
| C. | FM discriminator detection |
| D. | Envelope detection |
| Answer» E. | |
| 2. |
QPSK provides twice the bandwidth efficiency and _______ energy efficiency as compared to BPSK. |
| A. | Twice |
| B. | Half |
| C. | Same |
| D. | Four times |
| Answer» D. Four times | |
| 3. |
QPSK has ________ the bandwidth efficiency of BPSK. |
| A. | Twice |
| B. | Same |
| C. | Half |
| D. | Four times |
| Answer» B. Same | |
| 4. |
The energy efficiency of DPSK is _________ to coherent PSK. |
| A. | Superior |
| B. | Same |
| C. | Zero |
| D. | Inferior |
| Answer» E. | |
| 5. |
In DPSK system, input signal is differentially encoded and then modulated using a ________ modulator. |
| A. | Amplitude |
| B. | Frequency |
| C. | BPSK |
| D. | QPSK |
| Answer» D. QPSK | |
| 6. |
By applying cos(2πft), BPSK signal is equivalent to ________ |
| A. | Double sideband suppressed carrier amplitude modulated waveform |
| B. | Single sideband suppressed carrier amplitude modulated waveform |
| C. | Frequency modulated waveform |
| D. | SSB amplitude waveform |
| Answer» B. Single sideband suppressed carrier amplitude modulated waveform | |
| 7. |
In BPSK, the ________ of constant amplitude carrier signal is switched between two values according to the two possible values. |
| A. | Amplitude |
| B. | Phase |
| C. | Frequency |
| D. | Angle |
| Answer» C. Frequency | |
| 8. |
In linear modulation technique __________ of transmitted signal varies linearly with modulating digital signal. |
| A. | Amplitude |
| B. | Frequency |
| C. | Phase |
| D. | Angle |
| Answer» B. Frequency | |
| 9. |
THE_ENERGY_EFFICIENCY_OF_DPSK_IS________TO_COHERENT_PSK.?$ |
| A. | Superior |
| B. | Same |
| C. | Zero |
| D. | Inferior |
| Answer» E. | |
| 10. |
QPSK provides twice the bandwidth efficiency and ____ energy efficiency as compared to BPSK.$ |
| A. | Twice |
| B. | Half |
| C. | Same |
| D. | Four times |
| Answer» D. Four times | |
| 11. |
QPSK has _____ the bandwidth efficiency of BPSK.$ |
| A. | Twice |
| B. | Same |
| C. | Half |
| D. | Four times |
| Answer» B. Same | |
| 12. |
Which of the following is not a detection technique used for detection of π/4 QPSK signals?$ |
| A. | Baseband differential detection |
| B. | IF differential detection |
| C. | FM discriminator detection |
| D. | Envelope detection |
| Answer» E. | |
| 13. |
QPSK signals perform better than OQPSK in the presence of phase jitter. State whether True or False. |
| A. | True |
| B. | False |
| Answer» C. | |
| 14. |
The bandwidth of OQPSK is _______ to QPSK. |
| A. | Identical |
| B. | Twice |
| C. | Half |
| D. | Four times |
| Answer» B. Twice | |
| 15. |
What is the full form of OQPSK? |
| A. | Optical Quadrature Phase Shift Keying |
| B. | Orthogonal Quadrature Pulse Shift Keying |
| C. | Orthogonal Quadrature Phase Shift Keying |
| D. | Offset Quadrature Phase Shift Keying |
| Answer» E. | |
| 16. |
In DPSK system, input signal is differentially encoded and then modulated using a _____ modulato? |
| A. | Amplitude |
| B. | Frequency |
| C. | BPSK |
| D. | QPSK |
| Answer» D. QPSK | |
| 17. |
DPSK uses coherent form of PSK. State whether True or False. |
| A. | True |
| B. | False |
| Answer» C. | |
| 18. |
BPSK uses non-coherent demodulator. State whether True or False. |
| A. | True |
| B. | False |
| Answer» C. | |
| 19. |
By applying cos(2πft), BPSK signal is equivalent to ________$ |
| A. | Double sideband suppressed carrier amplitude modulated waveform |
| B. | Single sideband suppressed carrier amplitude modulated waveform |
| C. | Frequency modulated waveform |
| D. | SSB amplitude waveform |
| Answer» B. Single sideband suppressed carrier amplitude modulated waveform | |
| 20. |
In BPSK, the _____ of constant amplitude carrier signal is switched between two values according to the two possible values. |
| A. | Amplitude |
| B. | Phase |
| C. | Frequency |
| D. | Angle |
| Answer» C. Frequency | |
| 21. |
Which of the following is not a linear modulation technique? |
| A. | OQPSK |
| B. | π/4 QPSK |
| C. | FSK |
| D. | BPSK |
| Answer» D. BPSK | |
| 22. |
Linear modulation techniques are not bandwidth efficient. State whether True or False. |
| A. | True |
| B. | False |
| Answer» C. | |
| 23. |
In linear modulation technique, ______ of transmitted signal varies linearly with modulating digital signal. |
| A. | Amplitude |
| B. | Frequency |
| C. | Phase |
| D. | Angle |
| Answer» B. Frequency | |