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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
Ohm is unit of all of the following except

Capacitance
Capacitive reactance
Resistance
Inductive reactance

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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.

60
30
90
45

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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?

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

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AC Fundamentals, Circuit and Circuit Theory
For the same peak value, which of the following wave has the least mean value?

Half wave rectified sine wave
Square wave
Sine wave
Triangular wave

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AC Fundamentals, Circuit and Circuit Theory
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of

Iron loss in core
Capacitive effect between adjacent coil turns
Increase in temperature
Skin effect

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

R2C
RC
RC2
R/C

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