Question 1 : Push pull amplifier is a class B amplifier.
1. True
2. False
3.
4.
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Question 2 : What is number of possible outputs if there is 7 line digital input?
1. 64
2. 32
3. 16
4. 128
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Question 3 : Which of the following is not necessarily an advantage of FM over AM?
1. less modulating power is required
2. better noise immunity is provided
3. higher bandwidth is required
4. carrier is of any shape
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Question 4 : Which is the true statement about frequency deviation in frequency modulation?
1. frequency deviation is proportional to carrier signal frequency
2. frequency deviation is proportional to amplitude of carrier signal
3. frequency deviation is proportional to modulating frequency
4. frequency deviation is proportional to amplitude of modulating signal
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Question 5 : The frequency deviation is proportional to frequency in phase modulated signal.
1. True
2. False
3.
4.
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Question 6 : For a phase modulated signal, the frequency deviation is proportional to ________
1. frequency only
2. amplitude only
3. only width
4. phase only
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Question 7 : Why frequency fogging is used in a carrier system?
1. to reduce noise
2. to reduce cross talk
3. to converge frequencies
4. to reduce distortion
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Question 8 : De-emphasis circuit is used ________
1. before detection
2. after detection
3. before encoding
4. after encoding
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Question 9 : Pre-emphasis is used to amplify _________ frequencies.
1. low
2. high
3. both low and high
4. local oscillator
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Question 10 : If the step size of a system is 0.0721, find its quantization power?
1. 3.25 x 10^-3
2. 4.33 x 10^-4
3. 4.33 x 10^-2
4. 3.25 x 10^-1
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