Canadian Basic pool, section 6-06

Basic

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Subelement 6

Feedlines and Antenna Systems

Section 6-06

concept of impedance matching

6-06-01

What device might allow use of an antenna on a band it was not designed for?

Correct Answer
A.
An antenna tuner
B.
An SWR meter
C.
A low pass filter
D.
A high pass filter

6-06-01

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6-06-02

What does an antenna matching unit do?

Correct Answer
A.
It matches a transceiver to a mismatched antenna system
B.
It helps a receiver automatically tune in stations that are far away
C.
It switches an antenna system to a transmitter when sending, and to a receiver when listening
D.
It switches a transceiver between different kinds of antennas connected to one feed line

6-06-02

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6-06-03

What would you use to connect a coaxial cable of 50 ohms impedance to an antenna of 35 ohms impedance?

A.
An SWR meter
Correct Answer
B.
An impedance-matching device
C.
A low pass filter
D.
A terminating resistor

6-06-03

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6-06-04

When will a power source deliver maximum output to the load?

A.
When air wound transformers are used instead of iron-core transformers
B.
When the power-supply fuse rating equals the primary winding current
Correct Answer
C.
When the impedance of the load is equal to the impedance of the source
D.
When the load resistance is infinite

6-06-04

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6-06-05

What happens when the impedance of an electrical load is equal to the internal impedance of the power source?

A.
The electrical load is shorted
Correct Answer
B.
The source delivers maximum power to the load
C.
No current can flow through the circuit
D.
The source delivers minimum power to the load

6-06-05

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6-06-06

Why is impedance matching important?

A.
So the load will draw minimum power from the source
B.
To ensure that there is less resistance than reactance in the circuit
C.
To ensure that the resistance and reactance in the circuit are equal
Correct Answer
D.
So the source can deliver maximum power to the load

6-06-06

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6-06-07

To obtain efficient power transmission from a transmitter to an antenna requires:

A.
high load impedance
B.
low ohmic resistance
Correct Answer
C.
matching of impedances
D.
inductive impedance

6-06-07

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6-06-08

To obtain efficient transfer of power from a transmitter to an antenna, it is important that there is a:

A.
high load impedance
Correct Answer
B.
matching of impedance
C.
proper method of balance
D.
low ohmic resistance

6-06-08

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6-06-09

If an antenna is correctly matched to a transmitter, the length of transmission line:

A.
must be a full wavelength long
B.
must be an odd number of quarter-wave
C.
must be an even number of half-waves
Correct Answer
D.
will have no effect on the matching

6-06-09

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6-06-10

The reason that an RF transmission line should be matched at the transmitter end is to:

A.
ensure that the radiated signal has the intended polarization
Correct Answer
B.
transfer the maximum amount of power to the antenna
C.
prevent frequency drift
D.
overcome fading of the transmitted signal

6-06-10

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6-06-11

If the centre impedance of a folded dipole is approximately 300 ohms, and you are using RG8U (50 ohms) coaxial lines, what is the ratio required to have the line and the antenna matched?

A.
2:1
B.
4:1
C.
10:1
Correct Answer
D.
6:1

6-06-11

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