Quiz: a-001-2qz

SKIN EFFECT & FIELDS

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1. A-001-002-001.... What is the result of skin effect?

as frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface
as frequency decreases, RF current flows in a thinner layer of the conductor, closer to the surface
thermal effects on the surface of the conductor increase impedance
thermal effects on the surface of the conductor decrease impedance
No Answer

2. A-001-002-002.... What effect causes most of an RF current to flow along the surface of a conductor?

piezoelectric effect
resonance effect
skin effect
layer effect
No Answer

3. A-001-002-003.... Where does almost all RF current flow in a conductor?

in a magnetic field in the centre of the conductor
in a magnetic field around the conductor
along the surface of the conductor
in the centre of the conductor
No Answer

4. A-001-002-004.... Why does most of an RF current flow within a very thin layer under the conductor's surface?

because the RF resistance of a conductor is much less than the DC resistance
because of skin effect
because a conductor has AC resistance due to self-inductance
because of heating of the conductor's interior
No Answer

5. A-001-002-005.... Why is the resistance of a conductor different for RF currents than for direct currents?

because of skin effect
because of the Hertzberg effect
because conductors are non-linear devices
because the insulation conducts current at high frequencies
No Answer

6. A-001-002-006....What unit measures the ability of a capacitor to store electrical charge?

coulomb
watt
volt
farad
No Answer

7. A-001-002-007....A wire has a current passing through it. Surrounding this wire there is:

a cloud of electrons
a skin effect that diminishes with distance
an electrostatic field
an electromagnetic field
No Answer

8. A-001-002-008.... In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?

in the direction determined by the left-hand rule
in all directions
in the same direction as the current
in the direct opposite to the current
No Answer

9. A-001-002-009.... What is the term for energy that is stored in an electromagnetic or electrostatic field?

potential energy
kinetic energy
ampere-joules
joule-coulombs
No Answer

10. A-001-002-0010....Between the charged plates of a capacitor there is:

an electrostatic field
a magnetic field
a cloud of electrons
an electric current
No Answer

11. A-001-002-011....Energy is stored within an inductor that is carrying a current. The amount of energy depends on this current, but it also depends on a property of the inductor. This property has the following unit:

coulomb
farad
watt
henry
No Answer

Points out of 11:

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