Question 1

___________ is the angular separation between the half-power points on an antenna's radiation pattern.

Accepted Answer

A)  Bandwidth
B)  Gain
C)  Beamwidth
D)  ResonanceE) A) and B)
F) All of the above

Question 2

Because microwave communications are line of sight,what must be made to ensure that no obstructions lie anywhere in the line between transmitter and receiver?

Accepted Answer

A)  Yagi-Uda configuration
B)  Polar pattern
C)  Path study
D)  Link-budget analysisE) None of the above
F) A) and C)

Question 3

An antenna with a purely resistive impedance exhibits what condition?

Accepted Answer

A)  Resistance
B)  Distance
C)  Resonance
D)  CapacitanceE) A) and B)
F) B) and D) C

Question 4

What does the most basic form of an antenna consist of?

Accepted Answer

A)  Single conductor
B)  Electric field
C)  Reflector
D)  AmplifierE) B) and C)
F) None of the above

Question 5

Antenna bandwidth is defined with respect to its design _____________.

Accepted Answer

A)  frequency
B)  components
C)  complexity
D)  directivityE) A) and B)
F) B) and C)

Question 6

The property of interchangeability for transmitting and receiving operations is antenna ____________.

Accepted Answer

A)  polarization
B)  frequency
C)  reciprocity
D)  impedanceE) A) and B)
F) None of the above

Question 7

There are three basic forms of horn antennas: sectoral,circular,and ______________.

Accepted Answer

A)  pyramidal
B)  horizontal
C)  vertical
D)  symmetricalE) None of the above
F) B) and D)

Question 8

The key reasons for the popularity of a parabolic reflector are its high gain and ___________.

Accepted Answer

A)  directivity
B)  simplicity
C)  low cost
D)  bandwidthE) A) and C)
F) B) and D)

Question 9

What results when the gain of an antenna is multiplied by its power input?

Accepted Answer

A)  Effective radiated power
B)  Effective isotropic radiated power
C)  Received power
D)  Transmitter output powerE) A) and B)
F) A) and C)

Question 10

Antenna gain is always expressed in terms of the ______________________.

Accepted Answer

A)  angular separation between the half-power points on its radiation pattern
B)  direction of maximum radiation
C)  presence of reactive components
D)  charge lines developing around the antennaE) A) and B)
F) A) and C) B

Question 11

Which of the following consists of a structure made of wire erected a short distance above the ground and insulated from the ground?

Accepted Answer

A)  Loading coil
B)  Counterpoise
C)  Feed line
D)  TransducerE) B) and D)
F) A) and B)

Question 12

What is the name of the portion of field energy that does collapse back into the antenna and is limited to the zone immediately surrounding the antenna?

Accepted Answer

A)  Radiation
B)  Far
C)  Near
D)  InductionE) All of the above
F) None of the above D

Question 13

An antenna array is one that has more than one element or component. What is the name of the array if one or more of the elements is not electrically connected?

Accepted Answer

A)  Parasitic
B)  Driven
C)  Collinear
D)  BroadsideE) A) and D)
F) B) and D)

Question 14

Dish antennas are capable of very high signal gains by focusing energy onto a very narrow ___________.

Accepted Answer

A)  beamwidth
B)  bandwidth
C)  current
D)  transmission lineE) A) and D)
F) A) and B)

Question 15

What is one advantage of connecting a resonant transmission line to an antenna?

Accepted Answer

A)  It decreases power losses.
B)  Its electrical length corresponds closely to its physical length.
C)  It is an effective resistance related to the power radiated by the antenna.
D)  It makes impedance matching unnecessary.E) A) and D)
F) None of the above

Question 16

Which of the following terms defines the orientation of the electric field,which is the same as the antenna's physical configuration?

Accepted Answer

A)  Reciprocity
B)  Beamwidth
C)  Resonance
D)  PolarizationE) B) and D)
F) All of the above

Question 17

What is the loop antenna's major application?

Accepted Answer

A)  Good gain over extremely wide range of frequencies
B)  Broadcast AM receivers
C)  Receiving antenna for broadcast FM
D)  Direction findingE) A) and C)
F) B) and C)

Question 18

___________ represent a cross-sectional view and attempt to show the three-dimensional radiation pattern in two dimensions.

Accepted Answer

A)  Longley-Rice models
B)  Polar plots
C)  Path studies
D)  Fade marginsE) All of the above
F) A) and C)

Question 19

All radio systems must be designed to be resistant to fading. What is one of the biggest factors that would cause reductions in signal strength?

Accepted Answer

A)  Antenna size
B)  Weather
C)  Noise
D)  Dry heatE) A) and B)
F) A) and D)

Question 20

The monopole antenna is used primarily with frequencies below __________.

Accepted Answer

A)  2 MHz
B)  100 MHz
C)  50 MHz
D)  55 MHzE) B) and C)
F) B) and D)

Exam 14: Antennas

___________ is the angular separation between the half-power points on an antenna's radiation pattern.

Correct AnswerverifiedShow Answer

Because microwave communications are line of sight,what must be made to ensure that no obstructions lie anywhere in the line between transmitter and receiver?

Correct AnswerverifiedShow Answer

An antenna with a purely resistive impedance exhibits what condition?

Correct AnswerverifiedC

What does the most basic form of an antenna consist of?

Correct AnswerverifiedShow Answer

Antenna bandwidth is defined with respect to its design _____________.

Correct AnswerverifiedShow Answer

The property of interchangeability for transmitting and receiving operations is antenna ____________.

Correct AnswerverifiedShow Answer

There are three basic forms of horn antennas: sectoral,circular,and ______________.

Correct AnswerverifiedShow Answer

The key reasons for the popularity of a parabolic reflector are its high gain and ___________.

Correct AnswerverifiedShow Answer

What results when the gain of an antenna is multiplied by its power input?

Correct AnswerverifiedShow Answer

Antenna gain is always expressed in terms of the ______________________.

Correct AnswerverifiedB

Which of the following consists of a structure made of wire erected a short distance above the ground and insulated from the ground?

Correct AnswerverifiedShow Answer

What is the name of the portion of field energy that does collapse back into the antenna and is limited to the zone immediately surrounding the antenna?

Correct AnswerverifiedD

An antenna array is one that has more than one element or component. What is the name of the array if one or more of the elements is not electrically connected?

Correct AnswerverifiedShow Answer

Dish antennas are capable of very high signal gains by focusing energy onto a very narrow ___________.

Correct AnswerverifiedShow Answer

What is one advantage of connecting a resonant transmission line to an antenna?

Correct AnswerverifiedShow Answer

Which of the following terms defines the orientation of the electric field,which is the same as the antenna's physical configuration?

Correct AnswerverifiedShow Answer

What is the loop antenna's major application?

Correct AnswerverifiedShow Answer

___________ represent a cross-sectional view and attempt to show the three-dimensional radiation pattern in two dimensions.

Correct AnswerverifiedShow Answer

All radio systems must be designed to be resistant to fading. What is one of the biggest factors that would cause reductions in signal strength?

Correct AnswerverifiedShow Answer

The monopole antenna is used primarily with frequencies below __________.

Correct AnswerverifiedShow Answer

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