List of top Electronics and Communication Engineering Questions on Signals and Systems

The signal $x(t) = A\cos(\omega t + \phi)$ is:
The Nyquist sampling theorem states that for a signal with maximum frequency $f_m$, the sampling frequency must be:
What is the Z-transform of a unit impulse function $\delta[n]$?
A scope in RADAR system displays
Which of the following RADAR cannot be used for range measurement?
The spectral density of White noise is
The modulation method that represents bits as different phase shifts of a carrier is
A capacitor of \(0.5\,\mu F\) is used to tune a signal of \(200\,kHz\). The tuning frequency is
In a commercial FM broadcasting the maximum frequency deviation is
The data rate of a binary signal with a bit time 11.5 microseconds is
The Nyquist sampling rate for a signal band limited to \(4\,kHz\) is
For M-ary PSK, the signal constellation is
Which of the following circuits is an indirect method of generating FM?
An AM wave is given by \(C(t)=10[1+0.4\cos(10^4 t)+0.3\cos(10^5 t)]\cos(10^6 t)\). The modulation index of the envelope is
The envelope detector is
The SSB-SC can be obtained from balanced modulator by connecting at its output a
The function of a pre-emphasis circuit in a communication system is to boost
Correct Marks: 1 Wrong Marks: 0
Which of the following is active transducer?
What type of transducer is used to convert force into electrical signals?
What is the function of a signal generator?
In broadcast television, the number of scanning per frame is chosen to be an odd number to
What is the bandwidth of a signal if the highest frequency is 5 kHz and the lowest frequency is 2 kHz?
According to Parseval's theorem the energy spectral density curve is equal to the area under (The question is phrased a bit oddly. "energy spectral density curve is equal to the area under..." Parseval's theorem relates energy in time domain to energy in frequency domain. The area under the Energy Spectral Density (ESD) curve *is* the total energy.)
Phase variation with respect to frequency is given by \( \phi(\omega) = 2\omega^2 + \cos\omega \). Then, group delay of the system is
The LTI system is said to be initially relaxed system when