AC Fundamentals, Circuit and Circuit Theory
Power factor of an electrical circuit is equal to

R/Z
Ratio of useful current to total current Iw/I
Cosine of phase angle difference between current and voltage
all of these

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AC Fundamentals, Circuit and Circuit Theory
Time constant of an inductive circuit

Increases with increase of inductance and decrease of resistance
Increases with the increase of inductance and the increase of resistance
Increases with the decrease of inductance and decrease of resistance
Increases with decrease of inductance and increase of resistance

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AC Fundamentals, Circuit and Circuit Theory
An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms,

None of the listed here
Both resistance and inductance carry equal currents
The current through the resistance is more
The current through the resistance is less

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