Canadian Basic pool, section 6-01

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Subelement 6

Feedlines and Antenna Systems

Section 6-01

feed line characteristics, characteristic impedance

6-01-01

What connects your transceiver to your antenna?

A.
The power cord
B.
A ground wire
Correct Answer
C.
A feed line
D.
A dummy load

6-01-01

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6-01-02

The characteristic impedance of a transmission line is determined by the:

A.
length of the line
Correct Answer
B.
physical dimensions and relative positions of the conductors
C.
frequency at which the line is operated
D.
load placed on the line

6-01-02

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6-01-03

The characteristic impedance of a 20 metre piece of transmission line is 52 ohms. If 10 metres were cut off, the impedance would be:

Correct Answer
A.
52 ohms
B.
26 ohms
C.
39 ohms
D.
13 ohms

6-01-03

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6-01-04

The impedance of a coaxial line:

Correct Answer
A.
can be the same for different diameter line
B.
changes with the frequency of the energy it carries
C.
is correct for only one size of line
D.
is greater for larger diameter line

6-01-04

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6-01-05

What commonly available antenna feed line can be buried directly in the ground for some distance without adverse effects?

A.
300 ohm twin-lead
B.
600 ohm open-wire
C.
75 ohm twin-lead
Correct Answer
D.
coaxial cable

6-01-05

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6-01-06

The characteristic impedance of a transmission line is:

A.
the impedance of a section of the line one wavelength long
B.
the dynamic impedance of the line at the operating frequency
C.
the ratio of the power supplied to the line to the power delivered to the termination
Correct Answer
D.
equal to the pure resistance which, if connected to the end of the line, will absorb all the power arriving along it

6-01-06

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6-01-07

A transmission line differs from an ordinary circuit or network in communications or signaling devices in one very important way. That important aspect is:

A.
capacitive reactance
B.
inductive reactance
Correct Answer
C.
propagation delay
D.
resistance

6-01-07

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6-01-08

The characteristic impedance of a parallel wire transmission line does not depend on the:

Correct Answer
A.
velocity of energy on the line
B.
radius of the conductors
C.
centre to centre distance between conductors
D.
dielectric

6-01-08

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6-01-09

Any length of transmission line may be made to appear as an infinitely long line by:

Correct Answer
A.
terminating the line in its characteristic impedance
B.
leaving the line open at the end
C.
shorting the line at the end
D.
increasing the standing wave ratio above unity

6-01-09

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6-01-10

What factors determine the characteristic impedance of a parallel-conductor antenna feed line?

Correct Answer
A.
The distance between the centres of the conductors and the radius of the conductors
B.
The distance between the centres of the conductors and the length of the line
C.
The radius of the conductors and the frequency of the signal
D.
The frequency of the signal and the length of the line

6-01-10

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6-01-11

What factors determine the characteristic impedance of a coaxial antenna feed line?

Correct Answer
A.
The ratio of the diameter of the inner conductor to the diameter of the braid
B.
The diameter of the braid and the length of the line
C.
The diameter of the braid and the frequency of the signal
D.
The frequency of the signal and the length of the line

6-01-11

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