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

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

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AC Fundamentals, Circuit and Circuit Theory
Capacitive reactance is more when

Capacitance is less and frequency of supply is more
Capacitance is less and frequency of supply is less
Capacitance is more and frequency of supply is more
Capacitance is more and frequency of supply is less

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AC Fundamentals, Circuit and Circuit Theory
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

None of the listed here
Both waves must have zero value at the same time
Both waves must have identical peak values
Both waves must have same frequency

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