Canadian Basic pool, section 6-07

Basic

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Subelement 6

Feedlines and Antenna Systems

Section 6-07

isotropic source, polarization via element orientation

6-07-01

What does horizontal wave polarization mean?

A.
The electric and magnetic lines of force of a radio wave are perpendicular to the earth's surface
B.
The electric lines of force of a radio wave are perpendicular to the earth's surface
Correct Answer
C.
The electric lines of force of a radio wave are parallel to the earth's surface
D.
The magnetic lines of force of a radio wave are parallel to the earth's surface

6-07-01

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6-07-02

What does vertical wave polarization mean?

A.
The magnetic lines of force of a radio wave are perpendicular to the earth's surface
Correct Answer
B.
The electric lines of force of a radio wave are perpendicular to the earth's surface
C.
The electric and magnetic lines of force of a radio wave are parallel to the earth's surface
D.
The electric lines of force of a radio wave are parallel to the earth's surface

6-07-02

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6-07-03

What electromagnetic wave polarization does a Yagi antenna have when its elements are parallel to the earth's surface?

A.
Helical
Correct Answer
B.
Horizontal
C.
Vertical
D.
Circular

6-07-03

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6-07-04

What electromagnetic wave polarization does a half-wavelength antenna have when it is perpendicular to the earth's surface?

A.
Circular
B.
Horizontal
C.
Parabolical
Correct Answer
D.
Vertical

6-07-04

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6-07-05

Polarization of an antenna is determined by:

A.
the height of the antenna
Correct Answer
B.
the electric field
C.
the type of antenna
D.
the magnetic field

6-07-05

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6-07-06

An isotropic antenna is a:

Correct Answer
A.
hypothetical point source
B.
infinitely long piece of wire
C.
dummy load
D.
half-wave reference dipole

6-07-06

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6-07-07

What is the antenna radiation pattern for an isotropic radiator?

A.
A parabola
B.
A cardioid
C.
A unidirectional cardioid
Correct Answer
D.
A sphere

6-07-07

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6-07-08

VHF signals from a mobile station using a vertical whip antenna will normally be best received using a:

A.
random length of wire
B.
horizontal ground-plane antenna
Correct Answer
C.
vertical ground-plane antenna
D.
horizontal dipole antenna

6-07-08

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6-07-09

A dipole antenna will emit a vertically polarized wave if it is:

A.
fed with the correct type of RF
B.
too near to the ground
C.
parallel with the ground
Correct Answer
D.
mounted vertically

6-07-09

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6-07-10

If an electromagnetic wave leaves an antenna vertically polarized, it will arrive at the receiving antenna, by ground wave:

A.
polarized at right angles to original
Correct Answer
B.
vertically polarized
C.
horizontally polarized
D.
polarized in any plane

6-07-10

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6-07-11

Compared with a horizontal antenna, a vertical antenna will receive a vertically polarized radio wave:

A.
at weaker strength
B.
without any comparative difference
C.
if the antenna changes the polarization
Correct Answer
D.
at greater strength

6-07-11

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