Test: Communication System- 3 - Electrical Engineering (EE) MCQ
25 Questions MCQ Test - Test: Communication System- 3
Which one of the following statements is correct?
Noise has the greatest effect in a communication system when it interferes with the signal
The spectral density and autocorrelation function of white noise is
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The power spectral density increases as frequency decreases for
Which one of the following types of noise gains importance at high frequency
For a message signal m(t) = cos (2πfmt) and carrier of frequency fc, which of the following represents a single sideband (SSB) signal
Which one of the following is represented by v(t) = 5[cos (106 π t) – sin (103 π t) × sin(106 π t)]
Which of the following modulated signals can be detected by an envelope detector
Which of the following desirable features are possessed by SSB in comparison to AM
1. Less power is required
2. Bandwidth required is less
3. Antenna size can be reduced
4. Low frequency can be used
Select the correct answer using the codes given below:
One of the advantage of base modulation over collector modulation of a transistor Class C amplifier is
A modulated signal is given by,
s(t) = m1(t) cos (2 π fct) + m2(t) sin (2 π fct)
where the baseband signal m1(t) and m2(t) have bandwidths of 10 kHz and 15 kHz respectively. The bandwidth of the modulated signal, in kHz, is
In a low level modulation AM system, the amplifiers following the modulated stage can be
In a 100% amplitude modulated signal, if the total transmitted power is P, then carrier power will be
In AM, the percentage of total power in sideband is
In an amplitude modulated system, if the total power is 600 W and the power in carrier is 400 W, then the modulation index is
The modulation index of an AM is changed from 0 to 1. How does the transmitted power change
A 10 kW carrier is sinusoidally modulated by two carriers corresponding to a modulation index of 30% and 40% respectively. The total radiated power is
In an AM signal when the modulation index is one, the maximum power Pt (where Pc is the carrier power) is equal to
An amplitude modulated signal is [A + 0.5 A 
] cos wct where wm and wc are respectively, modulating and carrier frequencies. The power efficiency is
A carrier is amplitude modulated by 4 signals of frequency 10 kHz, 15 kHz, 20 kHz and 25 kHz. What is the bandwidth of the modulated signal
VSB modulation as compared to SSB modulation, for band occupies
Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth
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