Canadian Basic pool, section 6-08

Basic

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Subelement 6

Feedlines and Antenna Systems

Section 6-08

wavelength vs physical length

6-08-01

If an antenna is made longer, what happens to its resonant frequency?

Correct Answer
A.
It decreases
B.
It increases
C.
It stays the same
D.
It disappears

6-08-01

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6-08-02

If an antenna is made shorter, what happens to its resonant frequency?

A.
It stays the same
Correct Answer
B.
It increases
C.
It disappears
D.
It decreases

6-08-02

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6-08-03

The wavelength for a frequency of 25 MHz is:

A.
15 metres (49.2 ft)
B.
4 metres (13.1 ft)
Correct Answer
C.
12 metres (39.4 ft)
D.
32 metres (105 ft)

6-08-03

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6-08-04

The velocity of propagation of radio frequency energy in free space is:

Correct Answer
A.
300 000 kilometres per second
B.
3000 kilometres per second
C.
150 kilometres per second
D.
186 000 kilometres per second

6-08-04

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6-08-05

Adding a series inductance to an antenna would:

A.
increase the resonant frequency
B.
have little effect
Correct Answer
C.
decrease the resonant frequency
D.
have no change on the resonant frequency

6-08-05

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6-08-06

The resonant frequency of an antenna may be increased by:

A.
lowering the radiating element
B.
increasing the height of the radiating element
Correct Answer
C.
shortening the radiating element
D.
lengthening the radiating element

6-08-06

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6-08-07

The speed of a radio wave:

A.
is infinite in space
Correct Answer
B.
is the same as the speed of light
C.
is always less than half speed of light
D.
varies directly with frequency

6-08-07

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6-08-08

At the end of suspended antenna wire, insulators are used. These act to:

Correct Answer
A.
limit the electrical length of the antenna
B.
increase the effective antenna length
C.
allow the antenna to be more easily held vertically
D.
prevent any loss of radio waves by the antenna

6-08-08

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6-08-09

To lower the resonant frequency of an antenna, the operator should:

A.
shorten it
Correct Answer
B.
lengthen it
C.
ground one end
D.
centre feed it with TV ribbon feeder

6-08-09

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6-08-10

One solution to multiband operation with a shortened radiator is the "trap dipole" or trap vertical. These "traps" are actually:

A.
large wire-wound resistors
Correct Answer
B.
a coil and capacitor in parallel
C.
coils wrapped around a ferrite rod
D.
hollow metal cans

6-08-10

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6-08-11

The wavelength corresponding to a frequency of 2 MHz is:

A.
360 m (1181 ft)
Correct Answer
B.
150 m (492 ft)
C.
1500 m (4921 ft)
D.
30 m (98 ft)

6-08-11

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