Deck 13: Wave Propagation

Question 1

The highest frequency transmitted vertically under given ionosphere conditions that will be returned to the earth is called the:

A) critical angle
B) damped frequency
C) critical frequency
D) reflected frequency
E) none of the above

Answer 1

C

Question 2

RFI is:

A) radiofrequency Interference
B) polarization
C) reactive
D) all of the above
E) none of the above

Answer 2

A

Question 3

When a satellite is parked in orbit approximately 22,000 miles of the earth's surface, it is said to be in:

A) geo-synchronous orbit
B) synchronous orbit
C) lunar orbit
D) A and C
E) A and B

Answer 3

E

Question 4

Between the point where the ground wave is completely dissipated and the point where the fist sky wave returns is called:

A) quiet zone
B) fading
C) skip zone
D) A and B
E) A and C

Question 5

A point in space that radiates equally in all directions is:

A) isotropic Point source
B) parabolic reflector
C) an antenna
D) electromagnetic wave
E) none of the above

Question 6

The type of wave that is limited to line-of-sight transmission distances is:

A) space wave.
B) ground wave.
C) sky wave.

Question 7

The diffraction process allows reception beyond a mountain in all but a small area known as:

A) dead zone.
B) masking.
C) open space.
D) shadow zone.

Question 8

The Ku band frequency range is approximately

A) 4-8 GHz
B) 1-2 GHz
C) 8-12 GHz
D) 2-4 GHz
E) 12-18 GHz

Question 9

The bending of electromagnetic waves due to its passing through regions of different densities is known as

A) reflection
B) diffraction
C) radiation
D) refraction

Question 10

The constant temperature stratosphere is also called the:

A) sunspot region
B) perisphere
C) ionosphere
D) critical frequency
E) none of the above

Question 11

GPS currently uses a constellation of

A) 28 satellites
B) 40 satellites
C) 33 satellites
D) 22 satellites
E) 18 satellites

Question 12

The polarization of an electromagnetic wave is determined by the direction of:

A) H field.
B) B field.
C) E field.
D) all of the above

Question 13

Another term for groundwave is:

A) space wave.
B) surface wave.
C) sky wave.
D) direct wave.

Question 14

What is used to accommodate severe fading problems?

A) space diversity
B) diversity reception
C) frequency diversity
D) angle diversity
E) all of the above

Question 15

The characteristic impedance of free space is:

A) 75 ohms.
B) 300 ohms.
C) 50 ohms.
D) 377 ohms.

Question 16

A term used to describe variations in signal strength that occur at a receiver during the time a signal is being received is known as:

A) bouncing
B) refraction
C) fading
D) skipping

Question 17

An electronic system performing the reception, frequency translation, and retransmission is called a:

A) satellite
B) transponder
C) superheterodyne
D) TRF

Question 18

The C-band frequency range is approximately.

A) 2-4 GHz
B) 1-2 GHz
C) 12-18 GHz
D) 4-8 GHz
E) 8-12 GHz

Question 19

The term for the case when the same signal arrives at the TV receiver at the two different times is:

A) phasing
B) tagging
C) reflecting
D) ghosting
E) pulsing

Question 20

A device that converts electrical energy into electromagnetic energy is known as:

A) an antenna.
B) a light bulb.
C) a transducer.
D) all of the above.

Question 21

The typical satellite orbits being used for the satellite radio service are

A) polar
B) geostationary
C) inclined
D) A and B
E) B and C

Question 22

At resonance, the impedance of a crystal should be:

A) maximum
B) minimum
C) variable
D) A and C
E) none of the above

Question 23

The perigee of a satellite orbit is

A) closest point to earth
B) is the average distance to earth
C) farthest point from earth
D) none of the above

Question 24

Calculate the figure of merit for an earth station with the following specifications: Antenna Gain: 31 Reflector Teq: 25
LNA Teq: 75
RX misc Teq: 2

A) 10.9
B) 14.9
C) 11.0
D) none of the above

Question 25

The apogee of a satellite orbit is

A) closest point to earth
B) farthest point from earth
C) is the average distance to earth
D) none of the above