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Communication Systems

Communication Systems
A modem is classified as low speed if data rate handled is

Upto 400 bps
Upto 250 bps
Upto 600 bps
Upto 100 bps

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Communication Systems
The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?

Gets increased by 50 percent
Gets halved
Remains unchanged
Gets doubled

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Communication Systems
For attenuation of high frequencies we should use

Inductance
Resistance
Series capacitance
Shunt capacitance

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Communication Systems
A cordless telephone using separate frequencies for transmission in base and portable units is known as

Duplex arrangement
Either A or B
Half duplex arrangement
Neither A nor B

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Communication Systems
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as

6E
4E
3E
2E

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Communication Systems
Skip distance depends on time of day and angle of incidence.

True
False

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