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AC Fundamentals, Circuit and Circuit Theory

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
16 kVAR
12 kVAR
8 kVAR

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AC Fundamentals, Circuit and Circuit Theory
The safest value of current the human body can carry for more than 3 second is

4 mA
9 mA
5 mA
15 mA

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AC Fundamentals, Circuit and Circuit Theory
The transient currents are associated with the

Applied voltage to the circuit
Changes in the stored energy in the inductors and capacitors
Impedance of the circuit
Resistance of the circuit

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AC Fundamentals, Circuit and Circuit Theory
The square waveform of current has following relation between r.m.s. value and average value.

r.m.s. value of current is less than average value
r.m.s. value is equal to average value
None of these
r.m.s. value of current is greater than average value

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

Current lags behind the voltage by 90°
None of the listed here
Current can lead or lag the voltage by 90°
Current is in phase with the voltage

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AC Fundamentals, Circuit and Circuit Theory
If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?

84.84 sin 25 t
42.42 sin 314 t
30 sin 50 t
60 sin 25 t

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