Question 11 : Carrier frequency remains constant in cell communication.
1. True
2. False
3.
4.
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Question 12 : Power spectral density of thermal noise remains uniform upto frequency ___________
1. 10¹⁵ HZ
2. 10⁵ HZ
3. 10² HZ
4. 10¹³ HZ
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Question 13 : In Phase Modulation the phase of carrier signal is varied.
1. True
2. False
3.
4.
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Question 14 : In which modulation, frequency of carrier signal is varied with the amplitude of modulating signal?
1. FM
2. AM
3. PM
4. VSB
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Question 15 : Monopole antenna is a type of travelling wave antenna.
1. True
2. False
3.
4.
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Question 16 : The equation 20sin?(10⁸ t + 3 sin? 10⁹ t) represents which modulation?
1. AM
2. DSB-SC
3. PM
4. FM
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Question 17 : What will be the effect on power if the modulation index of a frequency modulated signal is increased?
1. increases
2. decreases
3. remains constant
4. first increases and then decreases
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Question 18 : Flyback switched mode is used in television because it can supply many voltage outputs.
1. True
2. False
3.
4.
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Question 19 : In a Vidicon camera tube, the side of target plate facing the light has a coating of Sno₂ (tin oxide) and the side facing electron gun has a coating of antimony trisulphide.
1. True
2. False
3.
4.
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Question 20 : Autocorrelation function of white noise is ________
1. an impulse function
2. a step function
3. a constant
4. a variable
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