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Communication Systems

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

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

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

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

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Communication Systems
When the length of antenna is a whole wavelength

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

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Communication Systems
If sampling is done at the rate of 10 kHz. The bandwidth required is

10 kHz
70 kHz
35 kHz
1280 kHz

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Communication Systems
One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

High power output per transistor
The lower modulating power requirement
Improved efficiency
Better linearity

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Communication Systems
In TV systems, equalising pulses are sent during

Vertical blanking
Horizontal blanking
Serrations
Horizontal retrace

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MORE MCQ ON Communication Systems

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