Key Topic 8: Conduction Flashcards
3-8A1: What is the term used to identify an AC voltage that would cause the same heating in a resistor as a corresponding value of DC voltage?
A. Cosine voltage.
B. Power factor.
C. Root mean square (RMS)
D. Average voltage.
C. Root mean square (RMS)
3-8A2: What happens to reactive power in a circuit that has both inductors and capacitors?
A. It is dissipated as heat in the circuit.
B. It alternates between magnetic and electric fields and is not dissipated.
C. It is dissipated as inductive capacitive fields.
D. It is dissipated as kinetic energy within the circuit.
B. It alternates between magnetic and electric fields and is not dissipated.
3-8A3: Halving the cross-sectional area of a conductor will:
A. Not affect the resistance.
B. Quarter the resistance.
C. Double the resistance.
D. Halve the resistance.
C. Double the resistance.
3-8A4: which of the following groups is correct for listing common materials in order of descending conductivity?
A. Silver, copper, aluminum, iron, and lead.
B. Lead, iron, silver, aluminum, and copper.
C. Iron, silver, aluminum, copper, and silver.
D. Silver, aluminum, iron, lead, and copper.
A. Silver, copper, aluminum, iron, and lead.
3-8A5: How do you compute true power (power dissipated in the circuit) in a circuit were AC voltage and current are out of phase?
A. Multiply RMS voltage times RMS current.
B. Subtract apparent power from the power factor.
C. Divide apparent power by the power factor.
D. Multiply apparent power times the power factor.
D. Multiply apparent power times the power factor.
3-8A6: Assuming a power source to have a fixed value of internal resistance, maximum power will be transferred to the load when:
A. The load impedance is greater than the source impedance.
B. The load impedance equals the internal impedance of the source.
C. The load impedance is less than the source impedance.
D. The fix values of internal impedance are not relative to the power source.
B. The load impedance equals the internal impedance of the source.
