Question 61 : Single Sideband Modulation (SSB) is generally reserved for point-to-point communication.
1. True
2. False
3.
4.
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Question 62 : Function of duplexer in a RADAR is to permit the use of same antenna for transmission and reception.
1. True
2. False
3.
4.
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Question 63 : Which of the following stage is present in FM receiver but not in AM receiver?
1. Amplitude limiter
2. Demodulator
3. AM amplifier
4. Mixer
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Question 64 : LCD uses ________
1. sematic crystals
2. twisted nematic crystals
3. nematic crystals
4. cholesteric crystals
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Question 65 : The amount of power and bandwidth necessary to be transmitted for a given amount of information are reduced in _________
1. Single Sideband Modulation
2. Double Sideband Modulation
3. Vestigial Sideband Modulation
4. Amplitude Modulation
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Question 66 : A noise can be represented as superposition of spectral components.
1. True
2. False
3.
4.
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Question 67 : In SSB modulation, only a single sideband is transmitted leaving the other sideband and the carrier.
1. True
2. False
3.
4.
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Question 68 : Which of the following modulation system is used for video-modulation?
1. DSB-SC
2. SSB-SC
3. VSB
4. FM
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Question 69 : In FM, if we decreases modulating frequency then the modulation index ________
1. will increase, if the modulating voltage amplitude increases
2. will decrease, if the modulating voltage amplitude increases
3. will increase, if the modulating voltage amplitude remains constant
4. will decrease, if the modulating voltage amplitude remains constant
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Question 70 : A long wave AM broadcast transmitter needs _________
1. very small carrier power
2. very large carrier power
3. small carrier power
4. large carrier power
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