Chapter 12: Wave Propagation

An antenna can be thought of as a(n)

a. Oscillator

b. Capacitor

c. Transducer

d. Frequency multiplexer

C

A wave that is characterized by having its direction of propagation perpendicular to its oscillation is known as

a. Isotropic

b. Transverse

c. Polarized

d. Refractive

B

Which is not an effect of our environment on wave propagation?

a. Radiation

b. Reflection

c. Refraction

d. Diffraction

A

A point in space that radiates electromagnetic energy equally in a directions is called

a. Transverse

b. Isotropic point source

c. Omnisphere

d. Shadow zone

B

The process of waves, which traveling in straight paths, bending around an obstacle is

a. Radiation

b. Reflection

c. Refraction

d. Diffraction

D

Which is not one of the basic modes of getting a radio wave from the transmitting to receiving antenna?

a. Ground wave

b. Shadow wave

c. Space wave

d. Satellite link

e. Sky wave

B

The type of wave that is most affected by the D, E, and F layers of the ionosphere is:

a. Ground wave

b. Space wave

c. Sky wave

d. Satellite

C

The largest frequency that will be returned to earth when transmitted vertically under given ionospheric conditions is called the

a. Critical frequency

b. Maximum usable frequency (MUF)

c. Optimum working frequency (OWF)

d. Skip zone

A

The characteristic impedance of free space is

a. Not known

b. Infinite

c. 50

d. 377

D

The area between the point where the ground wave ends and first sky wave returns is called the

a. Quiet zone

b. Skip zone

c. Null Zone

d. All the above

e. a and b

E

The refraction and reflection action of a skywave between the ionosphere and ground is known as

a. Space diversity

b. Skip

c. Tropospheric scattering

d. Fading

B

A satellite communication system used by companies such as K-Mart to quickly verify credit cards and check inventory data is called

a. VSAT

b. MSAT

c. SATCOM

d. WESTAR

A

A common type of radio wave interference is

a. EMI

b. Fading

c. Reflections

d. All the above

D

Diversity reception does not include:

a. Space diversity

b. Time diversity

c. Frequency diversity

d. Angle diversity

B

When installing a receiving antenna, you can often overcome diffraction problems by finding a

a. Null zone

b. Downlink

c. Hot spot

d. Skip zone

C