Sky wave propagation is used to

• increase range

• decrease range

One type of space wave propagation is

• sky wave propagation

• satellite communication

Disadvantage of sky wave propagation

• Fading

• low range

• all the above

• none of the above

Limitation of Line-of-sight propagation

• need for repeater

• curvature of earth

• fading

Example of satellite communication

• FM radio

• AM radio

• GPS

• all the above

Identify the factors affecting ground wave propagation

• frequency, effect of ground,polarization

• frequency, curvature of earth,polarization

• all of the above

• none of the above

The 3 layers of ionosphere are

• D,E&F

• B,D&E

• D,F1&F2

• None of the above

During daytime F layer is divided into

• F1&F2

• E1&F1

• D&E

• E&F

During nighttime the vanishing layers are

• E&F

• D&E

• F1&F2

The frequency suitable at daytime are

• (10-30)MHz

• (10-30)GHz

• (10-30)KHz