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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
In a sine wave the slope is constant

Between 0° and 90°
Between 90° and 180°
Between 180° and 270°
No where

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AC Fundamentals, Circuit and Circuit Theory
For a sine wave with peak value Imax the r.m.s. value is

1.414 Imax
0.707
0.5 Imax
0.9

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AC Fundamentals, Circuit and Circuit Theory
Power factor of the system is kept high

To reduce line losses
To reduce voltage regulation of the line
All of the listed here
To maximize the utilization of the capacities of generators, lines and transformers

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AC Fundamentals, Circuit and Circuit Theory
The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is

10 kVAR
12 kVAR
16 kVAR
8 kVAR

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AC Fundamentals, Circuit and Circuit Theory
In a pure inductive circuit

The current lags behind the voltage by 90°
The current leads the voltage by 90°
The current is in phase with the voltage
The current can lead or lag by 90°

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

Auto transformers
Electronic equipment
Transformers
Current transformers

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