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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will

Be reduced by half
Be reduced to one fourth
Be doubled
Be four times at high

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AC Fundamentals, Circuit and Circuit Theory
Two waves of the same frequency have opposite phase when the phase angle between them is

360°
0°
180°
90°

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AC Fundamentals, Circuit and Circuit Theory
The time constant of the capacitance circuit is defined as the time during which voltage

None of these
Falls to 36.8% of its final steady value
Rises to 63.2% of its final steady value
Rises to 38.6% of its final steady value

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

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

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

Actual power is zero
None of the listed here
Apparent power is zero
Reactive power is zero

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of ________ degrees.

45
30
60
90

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