2nd puc chapter 7 wireless communication

Name any 3 paths that a radio signal can take through space.

• The ground wave,

  The space wave,

  The sky wave.

• none

Name the two radio waves that propagate near to the surface of the earth.

• The ground wave

  The space wave

• none

How are ground waves polarized?

• The ground waves are vertically polarized.

• The ground waves are horizonatally polarized.

What is the frequency range of signal that propagate best over the surface of the earth?

• 30 kHz to 3 MHz.

• 3hz to 30hz

Identify the radio waves which are refracted by the ionosphere.

• Very high-frequency VHF (30 MHz to 300 MHz).

• 3hz to 30hz

Mention the range of frequency signals that porpagate best through ionosphere.

• 30 kHz to 3 MHz.

• 3Hz to 3 Hz.

-------- is the upper portion of the atmosphere, which absorbs large quantities of radiant energy from the sun and becomes heated and ionised.

• Ionosphere

• stratosphere

Which layer of the ionosphere has the greatest effect on a radio signal?

• F layer.

• d layer.

Which is the type of radio wave that propagates only over line-of-sight distance?

• VHF (very high frequency) (30 MHz to 300MHz).

• 3 hz to 30 hz

What is fading?

• Fading is the fluctuation in the strength of the radio signal.

• Fading is the weaking in the strength of the radio signal.