Question 51 : Amount of data transmitted for a given time is called _________
1. Noise
2. Frequency
3. Bandwidth
4. Power
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Question 52 : What is the need of doing Pre emphasis?
1. For boosting of modulating signal voltage
2. For boosting of modulating signal frequency
3. For removing amplitude variations due to noise
4. For removing frequency variations
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Question 53 : Calculate the Nyquist rate for the signal :
x(t) = 12cos50pt + 7 cos75p t – 13 cos100pt
1. 300 Hz
2. 600 Hz
3. 100 Hz
4. 150 Hz
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Question 54 : Which among the following is the drawback of Pulse Position Modulation (PPM)?
1. Synchronization is required between receiver and transmitter
2. Synchronization is not required between receiver and transmitter
3. Amplitude is constant
4. Instantaneous power of PPM modulated signals is constant
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Question 55 : Phase array radar can track many targets together.
1. True
2. False
3.
4.
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Question 56 : The upper and lower sideband frequencies for 5KHz amplitude modulation with a 30KHz carrier frequency will be?
1. 35KHz and 25KHz
2. 34KHz and 24KHz
3. 25KHz and 35KHz
4. 0.35KHz and 0.25KHz
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Question 57 : A narrow band noise can exist in _________
1. AM only
2. PCM only
3. FM only
4. AM and FM both
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Question 58 : When noise is passed through a narrow band filter, the output of filter should be?
1. triangular
2. square
3. parabolic
4. sinusoidal
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Question 59 : For which of the modulated system, the linear amplified modulated stage is used?
1. low level amplitude modulated system
2. high level amplitude modulated system
3. high level frequency modulated system
4. low level frequency modulated system
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Question 60 : For an AM transmitter, class C amplifier can be used after the modulation stage.
1. True
2. False
3.
4.
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