Vol2 Ure2 CDC 3D153
This is a URE #2 for CDC 3D153 and is to be used as a study aid for the RF transmission systems CDC's.
- 1.(213) Direct waves are radio waves that travel
- A.
Long distances with few interruptions
- B.
From point to point along the earth’s surface
- C.
Through the air in a straight line.
- D.
No more than 20 miles to the receive antenna
- 2.(213) Radio waves that travel near the earth’s surface are called
- A.
Earth waves
- B.
Global waves
- C.
Ground waves
- D.
Terrestrial waves
- 3.(213) Sky wave transmission is used for which type of communications?
- A.
Long distance
- B.
Subterrestrial
- C.
Atmospheric
- D.
Line of sight
- 4.(214) Which gives sky wave propagation its ability to communicate beyond the optical line-of sight (LOS)?
- A.
Refraction
- B.
Reflection
- C.
Earth's conductivity
- D.
Atmospheric charge
- 5.(214) Which gives sky wave propagation its ability to communicate beyond the optical line-ofsight (LOS)?
- A.
Refraction
- B.
Reflection
- C.
Earth's conductivity
- D.
Atmospheric change
- 6.(214) Frequencies higher than the critical frequency are?
- A.
Returned to earth
- B.
Passed into space
- C.
The most desirable
- D.
Refracted by the F2 layer
- 7.(214) In high frequency (HF) communications, the lowest frequency that arrives at the distant receiver on 90 percent of the undisturbed days of the month is called the?
- A.
Maximum usable frequency (MUF)
- B.
Lowest usable frequency (LUF)
- C.
Operating frequency
- D.
Critical frequency
- 8.(214) The abbreviation FOT is derived from the term?
- A.
Outbound traffic frequency
- B.
Optimum tropospheric frequency
- C.
Frequency of optimum transmission
- D.
Frequency of outbound frequency
- 9.(214) Magneton splitting creates two waves called?
- A.
Direct and indirect
- B.
Ordinary and abnormal
- C.
In-phase and out-of-phase
- D.
Ordinary and extraordinary
- 10.(214) What occurs when a transmitted signal travels over two or more separate paths during transmission?
- A.
Skip effects
- B.
Modulation
- C.
Multipathing
- D.
Magneton splitting
- 11.(215) Which layer of the ionosphere is most important to high frequency (HF) communications?
- A.
D
- B.
E
- C.
F
- D.
Topside
- 12.(215) During what season do we have the wider range of critical frequencies and less absorption of all frequencies?
- A.
Fall
- B.
Winter
- C.
Spring
- D.
Summer
- 13.(215) What is the recombination process dependent upon?
- A.
Season
- B.
Time of day
- C.
Regular variation
- D.
Irregular variations
- 14.(215) Sunspots are disturbances?
- A.
In the sun's atmosphere
- B.
On the sun's surface
- C.
In the ionosphere
- D.
Beneath the sun's surface
- 15.(216) For communications purposes, the usable frequency spectrum ranges from?
- A.
3Hz to 300 GHz+
- B.
300 Hz to 3000 GHz
- C.
3000 Hz to 3000 GHz
- D.
30 MHz to 300 MHz
- 16.(216) What U.S. government agency divides the radio frequency (RF) spectrum into different bands?
- A.
Federal Aviation Agency
- B.
American National Standard Institute
- C.
Federal Communications Commission
- D.
Institute of Electrical & Electronics Engineers, INC
- 17.(217) Near-vertical-incidence sky (NVIS) wave operations are most effective when you’re using?
- A.
Lower high frequency (HF) frequencies
- B.
Higher HF frequencies
- C.
Medium HF frequencies
- D.
Low takeoff antenna angles
- 18.(217) What frequency band is most susceptible to jamming?
- A.
Low frequency
- B.
Medium frequency
- C.
High Frequency
- D.
Very High Frequency
- 19.(217) What frequency bands doe the MILSTAR satellite system use?
- A.
High frequency (HF) and Ultra high Frequency (UHF)
- B.
Super-High Frequency (SHF) and Extremely high frequency (EHF)
- C.
Very high frequency (VHF) and SHF
- D.
VHF and UHF
- 20.(218) The main very high frequency (VHF) Ultra high frequency (UHF) communications emphasis is on?
- A.
Long range deployable communications
- B.
Short range fixed communications
- C.
Emergency communications
- D.
Air-ground communications
- 21.(219) Super high frequency (SHF)/extremely high frequency (EHF) range is limited to?
- A.
Scattering
- B.
Line-of-sight (LOS)
- C.
Earth's conductivity
- D.
Atmospheric absorption
- 22.(220) In a move to overcome the limited range of forward propagation by tropospheric scatter (FPTS) without requiring many costly relay systems, what was developed?
- A.
Optical horizon radar
- B.
Satellite communications
- C.
Microwave communications
- D.
Line-of-sight (LOS) communication
- 23.(220) Why isn’t very high frequency (VHF) normally used for satellite communications?
- A.
The frequency is too low
- B.
The frequency is too high
- C.
Ionospheric refraction can occur
- D.
The rate of absorption is too great
- 24.(220) When comparing the radio and optical horizons, which one is farther away and by what percent?
- A.
Optical; 15
- B.
Radio; 15
- C.
Optical; 33
- D.
Radio; 33
- 25.(220) When K is greater than 4/3, the radio horizon will?
- A.
Decrease, then increase.
- B.
Remain the same
- C.
Decrease
- D.
Increase
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