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Canadian Advanced Exam Question Bank

effective 4/01/2007

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A-007-01: Antenna tuner/transmatch, impedance matching circuits

A-007-01-01: For an antenna tuner of the "Transformer" type, which of the following statements is FALSE?

The circuit is known as a Pi-type antenna tuner (transmatch)

The input is suitable for 50 ohm impedance

The output is suitable for impedances from low to high

The circuit is known as a transformer-type antenna tuner (transmatch)



A-007-01-02: For an antenna tuner of the "Series" type, which of the following statements is FALSE?

The circuit is known as a Pi-type antenna tuner (transmatch)

The circuit is known as a Series-type antenna tuner (transmatch)

The output is suitable for impedances from low to high

The input is suitable for impedance of 50 ohms



A-007-01-03: For an antenna tuner of the "L" type, which of the following statements is FALSE?

The circuit is suitable for matching to a vertical groundplane antenna

The transmitter input is suitable for 50 ohms impedance

The antenna output is high impedance

The circuit is known as an L-type antenna tuner (transmatch)



A-007-01-04: For an antenna tuner of the "Pi" type, which of the following statements is FALSE?

The circuit is a series-type antenna tuner (transmatch)

The transmitter input is suitable for impedance of 50 ohms

The antenna output is suitable for impedances from low to high

The circuit is a Pi-type antenna tuner (transmatch)



A-007-01-05: What is a pi-network?

A network consisting of one inductor and two capacitors or two inductors and one capacitor

An antenna matching network that is isolated from ground

A network consisting of four inductors or four capacitors

A power incidence network



A-007-01-06: Which type of network offers the greatest transformation ratio?

Pi-network

Chebyshev

Butterworth

L-network



A-007-01-07: Why is an L-network of limited utility in impedance matching?

It matches only a small impedance range

It is thermally unstable

It is prone to self-resonance

It has limited power handling capability



A-007-01-08: How does a network transform one impedance to another?

It cancels the reactive part of an impedance and changes the resistive part

It produces transconductance to cancel the reactive part of an impedance

It introduces negative resistance to cancel the resistive part of an impedance

Network resistances substitute for load resistances



A-007-01-09: What advantage does a pi-L network have over a pi-network for impedance matching between a vacuum tube linear amplifier and a multiband antenna?

Greater harmonic suppression

Higher efficiency

Lower losses

Greater transformation range



A-007-01-10: Which type of network provides the greatest harmonic suppression?

Pi-L network

Inverse pi-network

Pi-network

L-network



A-007-01-11: Which three types of networks are most commonly used to match an RF power amplifier to a transmission line?

L, pi and pi-L

T, M and Q

M, pi and T

L, M and C





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Canadian Advanced Exam Question Bank
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A-007-02: Velocity factor, effect of line terminated in non-characteristic impedance
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