EET029_Quiz_1 - (c) SSB with pilot carrier (d) Lincompex 6....

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University Diploma Programs Electronic Equipment Maintenance EET-029: Introduction to Communications Quiz # 1 Name : ________________________________ ID #: ___________ 1. In a communication system, noise is most likely to affect the signal: (a) At the transmitter (b) In the channel (c) In the information source (d) At the destination 2. Indicate the false statement. Modulation is used to: (a) Reduce the bandwidth used (b) Separate differing transmissions (c) Ensure that intelligence may be transmitted over long distances (d) Allow the use of practicable antennas. 3. In a low-level AM system, amplifiers following the modulated stage must be: (a) Linear devices (b) Harmonic devices (c) Class C amplifiers (d) Nonlinear devices 4. If the carrier of a 100 percent modulated AM wave is suppressed, the percentage power saving will be: (a) 50 (b) 150 (c) 100 (d) 66.66 5. To provide two or more voice circuits with the same carrier, it is necessary to use: (a) ISB (b) Carrier reinsertion
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Unformatted text preview: (c) SSB with pilot carrier (d) Lincompex 6. The modulation index of an AM wave is changed from 0 to 1. The transmitted power is: (a) Unchanged (b) Halved (c) Doubled (d) Increased by 50 percent 1 EET 029 - Introduction to Communications Copyright © Electrical Engineering Department, KFUPM. 7. A carrier is simultaneously modulated by two sine waves with modulation indices of 0.3 and 0.4; the total modulation index: (a) is 1 (b) cannot be calculated unless the phase relations are known (c) is 0.5 (d) is 0.7 8. Indicate the false statement regarding the advantages of SSB over double sideband, full carrier AM: (a) More channel space is available (b) Transmitter circuits must be more stable, giving better reception (c) The signal is more noise-resistant (d) Much less power is required for the same signal strength 2 EET 029 - Introduction to Communications Copyright © Electrical Engineering Department, KFUPM....
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EET029_Quiz_1 - (c) SSB with pilot carrier (d) Lincompex 6....

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