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Communication Systems

Communication Systems
The characteristic impedance of a twin wire feeder used for TV signals is about

1000 ohm
100 ohm
300 ohm
500 ohm

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Communication Systems
Which of the following is an indirect way of generating FM?

Reactance FET modulator
Armstrong modulator
Reactance bipolar transistor
Varactor diode modulator

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Communication Systems
For attenuation of high frequencies we should use

Shunt capacitance
Resistance
Inductance
Series capacitance

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Communication Systems
When the length of antenna is a whole wavelength

The radiation is maximum in all directions
The radiation at right angles is zero
The radiation at right angles is maximum
The radiation is zero in all directions

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Communication Systems
The frequency range of 300 kHz to 3000 kHz is known as

High frequency
Medium frequency
Very high frequency
Low frequency

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Communication Systems
The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

20 kW
50 kW
0.5 kW
8 kW

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