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AC Fundamentals, Circuit and Circuit Theory

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
90
30
60

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

R2C
RC
R/C
RC2

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AC Fundamentals, Circuit and Circuit Theory
The period of a sine wave is ___________ seconds. Its frequency is

50 Hz
20 Hz
30 Hz
40 Hz

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

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

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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
Rises to 38.6% of its final steady value
Falls to 36.8% of its final steady value
Rises to 63.2% of its final steady value

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AC Fundamentals, Circuit and Circuit Theory
For a frequency of 200 Hz, the time period will be

0.5 s
0.0005 s
0.05 s
0.005 s

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