Which of these communications are not digital
A. PPM
B. PCM
C. PWM
PAM signal can be detected by using
Which one of the technique involves signal composed of light beams ?
Slope overload distortion occurs in
The Nyquist sampling interval, for the signal sinc (700 t) + sinc (500 t) is
In case of data transmission, which one of the following system will give maximum probabilityof error ?
Frequency shift keying is used mostly in
PAM signal can be demodulated by using
Modems are used for data transmission intelephone lines to
Capacity of a channel is given by
The channel capacity of a noiseless channel is equal to
The noise at the input to an ideal frequencydetector is white. Detector is operating above threshold. Power spectral density of noise atoutput is
The capacity of an analog communicationchannel, with 4 kHz bandwidth and 15 is valueof SNR, is
Noise has greatest effect in a communicationsystem when it interfere with signal.
Power spectral density of white noise
A system has a receiver noise resistance of 50W.It is connected to an antenna with an input resistance of 50W. The noise figure of the system is
Which one of the following types of noise gains importance at high frequency
Noise voltage in a resistor is relates as
Most usefull approach to radar system formonitoring the speed of moving vehicle is
Which one of the following circuits transmits twomessage simultaneously in one direction
The most probable bandwidth of a transponderin a satelite communication system is
The blind speed of an MTI radar can be avoidedby changing the
Order of wavelength for satelite communicationis
Radar system uses
Modem is used with personal computer to
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