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AC Fundamentals, Circuit and Circuit Theory

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

15 mA
4 mA
5 mA
9 mA

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AC Fundamentals, Circuit and Circuit Theory
In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters?

None of these
220 V
220/v3 V
220 v3 V

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AC Fundamentals, Circuit and Circuit Theory
The purpose of a parallel circuit resonance is to magnify

Current
Voltage
Frequency
Power

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AC Fundamentals, Circuit and Circuit Theory
Inductance of coil

Decreases with the increase in supply frequency
Is unaffected by the supply frequency
Becomes zero with the increase in supply frequency
Increases with the increase in supply frequency

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AC Fundamentals, Circuit and Circuit Theory
A parallel AC. circuit in resonance will

Act like a resistor of low value
Have a high voltage developed across each inductive and capacitive section
Have a high impedance
Have current in each section equal to the line current

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value and mean value is the same in the case of

Sine wave
Half wave rectified sine wave
Square wave
Triangular wave

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