AC Fundamentals, Circuit and Circuit Theory
The inductance of a coil can be increased by

Decreasing the number of turns
Decreasing the diameter of the former
Increasing core length
Choosing core material having high relative permeability

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AC Fundamentals, Circuit and Circuit Theory
Time constant of a capacitive circuit

Increases with the decrease of capacitance and increase of resistance
Increases with the decrease of capacitance and decrease of resistance
Increases with the increase of capacitance and decrease of resistance
Increase with increase of capacitance and increase of resistance

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AC Fundamentals, Circuit and Circuit Theory
The frequency of an alternating current is

The number of waves passing through a point in one second
The number of cycles generated in one minute
The speed with which the alternator runs
The number of electrons passing through a point in one second

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