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Communication Systems

Communication Systems
If output power of a radio receiver is doubled, its volume is increased by __________ dB.

3
-3
1
2

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Communication Systems
The colour of an object is decided by

The reflected colour
Reflected colour for opaque object and wavelength transmitted through it for transparent objects
None of these
The wavelength transmitted through it

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Communication Systems
In a TV receiver antenna the length of reflector rod

Is the same as that of dipole
Is more than that of dipole
Is less than that of dipole
May be equal, more or less than that of dipole

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Communication Systems
In TV systems, equalising pulses are sent during

Horizontal blanking
Serrations
Vertical blanking
Horizontal retrace

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Communication Systems
Commercial Frequency deviation of FM is

70 kHz
65 kHz
75 kHz
80 kHz

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Communication Systems
In Modulation, “carrier” is

Voltage with constant frequency, phase or amplitude
Resultant wave
Voltage for which frequency, phase or amplitude is varied
Speech voltage to be transmitted

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