SKIN EFFECT & FIELDS


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
   

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