Deck 13: Wave Propagation

Question 1

When is the degree of ionization greater?
A.Winter and nighttime
B.Summer and daytime
C.Winter and daytime
D.Summer and nighttime

Answer 1

Summer and daytime

Question 2

What type of system allows multiple inexpensive stations to be linked to a large,central installation?
A.Sirius
B.Earth station
C.Very small aperture terminal (VSAT)
D.Ultrasmall aperture terminal mobile satellite (MSAT)

Answer 2

Very small aperture terminal (VSAT)

Question 3

If an electromagnetic wave were radiated equally in all directions from a point source in free space,what would result?
A.Spherical wavefront
B.Electric field
C.Radio wave
D.Polarization

Answer 3

Spherical wavefront

Question 4

A(n)___________ is an electronic system performing reception,frequency translation,and retransmission.
A.antenna
B.transponder
C.attitude control
D.downlink

Question 5

Skip distance is affected by the degree of _________________.
A.ionic recombination
B.radiation
C.ionization
D.solar disturbance

Question 6

What type of orbit do geostationary orbits use?
A.Equatorial orbit
B.Polar orbit
C.Inclined orbit
D.Subsatellite orbit

Question 7

What type of diversity reception is comprised of two or more receiving antennas separated by 50 wavelengths or more?
A.Angle
B.Polarization
C.Frequency
D.Space

Question 8

Ionospheric storms often cause radio communications to become ____________
A.erratic
B.optimum
C.electromagnetic
D.radiated

Question 9

Which of the following laws states that an electric current or a changing electric field produces a magnetic field?
A.Maxwell's law
B.Ampere's law
C.Gauss's law
D.Faraday's law

Question 10

The highest frequency that is returned to Earth when transmitted vertically under given ionospheric conditions is called the ____________.
A.critical angle
B.maximum usable frequency
C.critical frequency
D.optimum working frequency

Question 11

The greater the bandwidth,the greater the problem with ________________.
A.phase distortion
B.refraction
C.tropospheric scatter
D.fading

Question 12

Which of the following is (are)the result of the interaction of changing electric and magnetic fields?
A.Satellite communication
B.GPS satellites
C.Wave propagation
D.Radio waves

Question 13

Which one of the following predicted the existence of electromagnetic waves and proposed that visible light was a form of electromagnetic energy?
A.Hans Christian Oersted
B.Michael Faraday
C.James Clerk-Maxwell
D.André Ampère

Question 14

What is it called when the azimuth and elevation angles for the Earth station antenna must be calculated so that the correct satellite can be seen?
A.GPS
B.Look angle
C.Footprint
D.Frequency-division multiple access

Question 15

What is the refracting and reflecting action of the ionosphere and the ground called?
A.Skipping
B.Multipath reception
C.Radio horizon
D.Shadow zone

Question 16

What type of information does Global Positioning System (GPS)provide?
A.Pinpoint geographic locations
B.Multipath transmissions
C.Converts energy from one form to another
D.Sky-wave communication

Question 17

What principle states that each point on a spherical wavefront may be considered as the source of a secondary spherical wavefront?
A.Faraday's
B.Huygens's
C.Ohm's
D.Maxwell's

Question 18

What has a strong effect on ground waves?
A.Refraction
B.Seawater
C.Changes in terrain
D.Seasonal changes

Question 19

_____________ occurs when waves pass from a medium of one density to another medium with a different density.
A.Radiation
B.Reflection
C.Refraction
D.Reception

Question 20

Which of the following is used to provide a performance measure for different satellite Earth stations?
A.Uplink budget
B.Downlink budget
C.Satellite link budget
D.Figure of merit

Question 21

Frequency blackouts are closely related to certain types of ____________.
A.sunspot activity
B.turbulence
C.fading
D.energy

Question 22

Reception of the Sirius Satellite Radio signal is made possible using antennas,special chip sets,and _______________.
A.attitude controls
B.diversity receivers
C.transducers
D.insulators

Question 23

Where would tropospheric scatter provide reliable long-distance communication links?
A.Deserts
B.Small cities
C.Suburban areas
D.Metropolitan centers

Question 24

A satellite communication system consists of an uplink,a downlink,and a(n)_______________.
A.apogee
B.electromagnetic field
C.perigee
D.orbiting satellite

Question 25

What is the area called between the point where the ground wave is completely dissipated and the point where the first sky wave returns,no signal will be heard?
A.Skip zone
B.Skip distance
C.Critical angle
D.Ionosphere