Welcome to your Communication Sytems MCQ practice assessment.
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Frequencies above _____ kHz, are referred to as the radio frequencies
The velocity of sound in dry air medium is 331.45 m/s. Calculate the velocity if there is an increase of temperature equal to 10 degrees Centigrade
Determine the equivalent noise temperature of a receiver with a noise figure of 4 dB at 300 K environment temperature.
The signal which is superimposed on a high-frequency sine wave is called _____.
White noise has _______ power spectral density.
It is the representation of a complex waveform in such a way that the sinusoidal components are displayed as a function of time.
Thermal noise in the communication system due to thermal electrons
An amplifier operating over a 2 MHz bandwidth has a 80 ohms input resistance. It is operating at 27 degree Celsius, has a voltage gain of 200 and input signal of 6 microvolts rms. Calculate the output rms noise
A network that has an input of 75 dB and an output of 35dB. The loss of the network is _____
A passive circuit, usually consisting of capacitance and/or inductance, that is inserted in series with the a-c power cord of an electronic device which allow the 60-Hz current to pass and suppressed high frequency noise components.
The value of a resistor creating noise is doubled. The noise power generated is therefore
Sound that vibrates at frequency too high for the human ear to hear (over 20 kHz)
A portion in a communications system, which processes the information so that it will become suitable to the characteristic of the transmission medium
A system having an input power of 2 mW an output power of 0.8 mW has a loss of:
When the power ratio of the output to input of a circuit is 200. What is the gain in dB?
Digital information is processed with a specified degree of
One of the following is not useful for comparing the noise performance of receivers
Wireless local-area networks occupy which of the following segments?
A single measuring circuit having a resistor if 10 kΩ is connected in series with a 0.5 μF capacitor. What is affective bandwidth?
Which of the following organizations does not maintain standards for communication systems?
