Modulation

21. In radio transmission, the medium of transmission is …_________

1. Space
2. An antenna
3. Cable
4. None of the above

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22. In superhetrodyne receiver, the input at mixer stage is _________

1. IF and RF
2. RF and AF
3. IF and AF
4. RF and local oscillator signal

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23. In the above question, what is the power in sidebands?

1. 8 kW
2. 6 kW
3. 06 kW
4. 9 kW

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24. In TV transmission, picture signal is _________ modulated

1. Frequency
2. Phase
3. Amplitude
4. None of the above

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25. In TV transmission, sound signal is _________ modulated

1. Amplitude
2. Frequency
3. Phase
4. None of the above

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26. Man made noise are _________ variations.

1. Amplitude
2. Frequency
3. Phase
4. Both phase and frequency

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27. Modulation is done in _________

1. Transmitter
2. Radio receiver
3. Between transmitter and radio receiver
4. None of the above

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28. Modulation refers to a low-frequency signal controlling the _________

1. Amplitude of the carrier
2. Frequency of the carrier
3. Phase of the carrier
4. May be any of the above

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29. Most of the amplification in a superhetrodyne receiver occurs at _________ stage

1. IF
2. RF amplifier
3. Audio amplifier
4. Detector

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30. Overmodulation (amplitude) occurs when signal amplitude is _________ carrier amplitude

1. Equal to
2. Greater than
3. Less than
4. None of the above

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