Radio wave propagation B.tech int

Ionization levels are highest in the -------------- of the ionosphere.

• upper end

• bottom

• middle

• upper left

The most important layer from the communication point of veiw is -------------------- .

• D

• E

• F1

• F2

The critical frequency of a layer is the ------------ frequency returned down to earth by that layer for -------------- incidence.

• highest, horizontal

• highest, vertical

• lowest, vertical

• lowest horizontal

Ground wave propagation occurs at frequencies

• below HF

• above HF

• below LF

• above LF

Sky wave propagation occurs at frequencies

• Below HF

• In HF

• Above HF

• None

Space wave propagation occurs at frequencies

• below HF

• In HF

• Above HF

• None

LOS is used in ___________.

• ground Wave Propagation

• Sky Wave Propagation

• Space Wave Propagation

• None

Ground wave propagation is widely used for

• AM Broadcasting

• Ship to ship Communication

• Over the horizon

• All

The sky wave propagation is suitable for frequencies between

• 2 to 30 MHz

• 4 to 45 MHz

• 10 to 80 MHz

• 50 to 70 MHz

The minimum distance between the Transmitter and receiver of a sky wave link should be ------------

• skip distance

• link distance

• Range

• None