Question 11 : What is the full form of NBFM?
1. Narrow band frequency modulation
2. National broadcast frequency modulation
3. Near band frequency modulation
4. Non broadcast frequency modulation
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Question 12 : In FM system, capture effect is observed when an FM receiver switching suddenly between two stations having nearby frequencies.
1. True
2. False
3.
4.
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Question 13 : What is the use of pre-emphasis?
1. to increase the signal to noise ratio for higher audio frequencies
2. to allow stereo audio to be carried by FM stations
3. to increase the signal to noise ratio for all audio frequencies
4. to increase the signal to noise ratio for lower audio frequencies
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Question 14 : Which statement is true about an SCA signal?
1. it can use amplitude modulation
2. it can use frequency modulation
3. is monaural
4. it can use amplitude as well as frequency modulation and is also monaural
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Question 15 : Mathematically, the number of sidebands in frequency modulated system is _________
1. infinite
2. one
3. two
4. zero
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Question 16 : If we compared to the USB, the power in the LSB is ________
1. one-fourth of USB
2. twice of USB
3. same as USB
4. half of USB
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Question 17 : Who originated the theory of radio waves?
1. Marconi
2. Bell
3. Hertz
4. Maxwell
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Question 18 : What will be the effect on power if the distance between the sidebands and center frequency increases?
1. power decreases
2. power increases
3. power remains same
4. power becomes twice of its previous value
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Question 19 : Signal to noise ratio of a frequency modulated system is better than amplitude modulated system.
1. True
2. False
3.
4.
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Question 20 : FM stereo _________
1. is implemented using an SCA signal
2. has a higher signal to noise ratio than mono FM
3. is not compatible with mono FM
4. uses DSBSC AM modulation
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