81. The signal power and noise power are denoted by S and N respectively. If the signal power increases to 3S and the noise power reduces by half, the ratio of old SNR to the new SNR is given by . . . . . . . .
82. In PLL, the range of input frequency for which the initially unlocked loop will lock on an input signal is known as
83. In a super heterodyne receiver, which stage produces IF signal?
84. The . . . . . . . . function gives a quantitative measure of the closeners or similarity between samples of a speech signal as a function of their time separation.
85. The saving in power in a DSB-SC system modulated at 80% is
86. If mt is modulation index of FM. What is the value of ratio $$\frac{{{{\left( {\frac{{\text{S}}}{{\text{N}}}} \right)}_{{\text{WBFM}}}}}}{{{{\left( {\frac{{\text{S}}}{{\text{N}}}} \right)}_{{\text{AM}}}}}}$$ for 100% amplitude modulation with identical total transmitted power?
87. Which is not true about frequency deviation in PM
88. An amplitude modulated amplifier has a radio frequency output of 50 W at 100% modulation. The internal loss in the modulator is 10 W. The unmodulated carrier power is
89. What is the assigned bandwidth of each of the channels in the AM broadcast band?
90. A carrier wave is phase modulated with frequency deviation of 20 kHz by a single tone frequency of 2 kHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unchanged, bandwidth of the PM signal is
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