Basic Science : Modulation And Demodulation QUESTIONS AND ANSWERS :: part1 : 6 to 10
Following Basic Science multiple choice objective type questions and answers will help you in many types of 2024 job and other entrance examinations :
6.The main advantage of frequency modulation over amplitude modulation is |
| that there will be no distortion |
| that the complete information is contained in the side bands |
| that it uses a wider band of frequencies |
| the elimination of noises |
7.RF amplification is used to amplify the waves |
| before detection |
| after detection |
| after modulation |
| after AF amplification |
8.The process of mixing AF signal and RF waves is known as |
| modulation |
| demodulation |
| oscillation |
| amplification |
9.A super-hetrodyne receiver selects a radio wave of frequency 850 kHz. Then the frequency of the local oscillator will be |
| 1305 kHz |
| 455 kHz |
| 850 kHz |
| 445 kHz |
10.In a super-hetrodyne receiver, the frequency of input fed to the amplifier circuit is |
| 600 kHz |
| 445 kHz |
| 455 kHz |
| 1055 kHz |
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