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AC FUNDAMENTALS, CIRCUIT AND CIRCUIT THEORY

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

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

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

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

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AC Fundamentals, Circuit and Circuit Theory
The time constant of a series R-C circuit is given by

RC2
R/C
RC
R2C

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AC Fundamentals, Circuit and Circuit Theory
The power is measured in terms of decibels in case of

Current transformers
Electronic equipment
Auto transformers
Transformers

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AC Fundamentals, Circuit and Circuit Theory
Inductance affects the direct current flow

At all the time of operation
Only at the time of turning on
Only at the time of turning off
At the time of turning on and off

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