COMMUNICATION SYSTEMS

Question - 150 Maximum mark : - 150

In a radio receiver, the short wave and medium wave stations are tuned by using the same capacitor but coils of different inductance

and

respectively then

None of these NULL NULL NULL

The number of telephonic message which are carried by a fiber at an instant with much less intensity loss are

2400 2200 2000 1800 NULL NULL NULL

Calculate the phase velocity of electromagnetic wave having electron density and frequency of D-layer,

electron

kHz

NULL NULL NULL

A laser device produces amplification in the

Microwave region Ultraviolet or visible region Infrared region None of the above NULL NULL NULL

Broadcasting antennas are generally

Omnidirectional type Vertical type Horizontal type None of these NULL NULL NULL

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