Q201
Open questionA DSB-SC signal can be demodulated using:
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Communication Systems
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Q202
Open questionDetermine the bandwidth occupied by a sinusoidal frequency modulated carrier for which the modulation index is 2.4.
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Q203
Open questionA receiver has poor IF selectivity. It will therefore also have poor-
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Q204
Open questionThe carrier of an AM signal obtained by sinusoidal modulation to a depth of modulation equal to 1, carries.
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Q205
Open questionConsider a message signal whose spectrum is given by and zero elsewhere. The message signal amplitude modulates a carrier fc = 1 MHz. The bandwidth of the modulated signal is:
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Q206
Open questionA probability density function is given by
The value of K should be
The value of K should be
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Q207
Open questionA uniformly distributed random variable X with probability density function
Where u(⋅) is the unit step function is passed through a transformation given in the figure below. The probability density function of the transformed random variable Y would be
Where u(⋅) is the unit step function is passed through a transformation given in the figure below. The probability density function of the transformed random variable Y would be
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Q208
Open questionConsider the following statements regarding signals:
1. Deterministic signal is a signal about which there is no uncertainty with respect to its value at any time.
2. Each signal within the ensemble has a certain probability of occurrence and the ensemble of signals is referred to as a random process.
3. EEG signal is an example of random signal.
Which of the above statements are correct?
1. Deterministic signal is a signal about which there is no uncertainty with respect to its value at any time.
2. Each signal within the ensemble has a certain probability of occurrence and the ensemble of signals is referred to as a random process.
3. EEG signal is an example of random signal.
Which of the above statements are correct?
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Q209
Open questionIn a communication system, the signal power is 13 dBm and noise power is -1 dBm. The SNR will be:
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Q210
Open questionA carrier of frequency 1 MHz is amplitude modulated by a signal of frequency 1 kHz to a depth of 60%. This is passed through a filter of characteristics shown in the given Figure-I and Figure-II. If the filter output is fed to an envelope detector, the detector output will be
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Q211
Open questionThe following cannot be used to remove the unwanted sideband in the SSB:
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Q212
Open questionHeterodyne principle is used in
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Q213
Open questionWhat is the modulation index of an FM signal having a carrier swing of 100 kHz and modulating frequency of 8 kHz?
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Q214
Open questionAn AM signal has a total power of 48 Watts with 45% modulation. The power in the carrier and the sidebands are
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Q215
Open questionThe RF amplifier A is having 3 dB NF & 5 dB of gain, amplifier B is having 3.5 dB NF & 15 dB. For overall noise figure of the cascaded system, the correct statement is:
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Q216
Open questionFor a symmetrical distribution the coefficient of skewness is
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Q217
Open questionA carrier of 10 kW is amplitude modulated to a depth of 100% by a sinusoid. Then the power of the transmitted AM wave is
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Q218
Open questionSelect correct answer-
A 400 W carrier is modulated to a depth of 75%. Calculate the total power in the modulated wave.
A 400 W carrier is modulated to a depth of 75%. Calculate the total power in the modulated wave.
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Q219
Open questionThe figure shows the block diagram of a frequency discriminator. What does the second block represent?
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Q220
Open questionPercentage modulation of an AM wave having a power content of 8 kW at carrier frequency and 2 kW in each of its side bands is
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