Question 71 : Trellis coded modulation uses
1. Non binary method
2. Uses redundant bits
3. No expansion of bandwidth
4. All of the mentioned
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Question 72 : An amplifier uses ______ to take input signal.
1. DC power
2. AC power
3. DC & AC power
4. None of the mentioned
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Question 73 : The bandwidth efficiency of MFSK is
1. M/log2M
2. log2M/M
3. M/log10M
4. log10M/M
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Question 74 : Average energy per bit is given by
1. average energy symbol/log2 M
2. average energy symbol * log2 M
3. log2 M/ Average energy symbol
4. none of the mentioned
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Question 75 : Which modulation spectrum has narrow main lobe?
1. QPSK
2. OQPSK
3. BPSK
4. MSK
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Question 76 : Which modulation requires more bandwidth?
1. QPSK
2. OQPSK
3. BPSK
4. BFSK
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Question 77 : The mixing and filtering of DSB removes
1. LSB
2. USB
3. LSB & USB
4. None of the mentioned
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Question 78 : The bandwidth efficiency of QFSK is _______ that of BFSK.
1. Greater than
2. Less than
3. Equal to
4. None of the mentioned
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Question 79 : The demodulator in delta modulation technique is
1. Differentiator
2. Integrator
3. Quantizer
4. None of the mentioned
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Question 80 : The system will be more bandwidth efficient as WTb decreases.
1. True
2. False
3.
4.
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