Canadian Advanced pool, section 1-02

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Subelement 1

Advanced Theory

Section 1-02

electrostatic and electromagnetic fields, skin effect

1-02-01

What is the result of skin effect?

Correct Answer
A.
As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface
B.
As frequency decreases, RF current flows in a thinner layer of the conductor, closer to the surface
C.
Thermal effects on the surface of the conductor increase impedance
D.
Thermal effects on the surface of the conductor decrease impedance

1-02-01

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1-02-02

What effect causes most of an RF current to flow along the surface of a conductor?

A.
Piezoelectric effect
B.
Resonance effect
Correct Answer
C.
Skin effect
D.
Layer effect

1-02-02

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1-02-03

Where does almost all RF current flow in a conductor?

A.
In a magnetic field in the centre of the conductor
B.
In a magnetic field around the conductor
Correct Answer
C.
Along the surface of the conductor
D.
In the centre of the conductor

1-02-03

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1-02-04

Why does most of an RF current flow within a very thin layer under the conductor's surface?

A.
Becasue the RF resistance of a conductor is much less than the DC resistance
Correct Answer
B.
Because of skin effect
C.
Because a conductor has AC resistance due to self-inductance
D.
Because of heating of the conductor's interior

1-02-04

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1-02-05

Why is the resistance of a conductor different for RF currents than for direct currents?

Correct Answer
A.
Because of skin effect
B.
Because of the Hertzberg effect
C.
Because conductors are non-linear devices
D.
Because the insulation conducts current at high frequencies

1-02-05

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1-02-06

What unit measures the capacity to store electrical energy in an electrostatic field?

A.
Coulomb
B.
Watt
C.
Volt
Correct Answer
D.
Farad

1-02-06

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1-02-07

What is an electromagnetic field?

A.
Current through the space around a permanent magnet
B.
The force that drives current through a conductor
C.
The current between the plates of a charged capacitor
Correct Answer
D.
The space around a conductor, through which a magnetic force acts

1-02-07

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1-02-08

In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?

Correct Answer
A.
In the direction determined by the lefthand rule
B.
In all directions
C.
In the same direction as the current
D.
In the direct opposite to the current

1-02-08

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1-02-09

What is the term for energy that is stored in an electromagnetic or electrostatic field?

Correct Answer
A.
Potential energy
B.
Kinetic energy
C.
Ampere-joules
D.
Joule-coulombs

1-02-09

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1-02-10

What is an electrostatic field?

Correct Answer
A.
The current between the plates of a charged capacitor
B.
The space around a conductor, through which a magnetic force acts
C.
Current through the space around a permanent magnet
D.
The force that drives current through a conductor

1-02-10

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1-02-11

What unit measures the capacity to store electrical energy in an electromagnetic field?

A.
Coulomb
B.
Farad
C.
Watt
Correct Answer
D.
Henry

1-02-11

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