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AC Fundamentals, Circuit and Circuit Theory

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

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

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AC Fundamentals, Circuit and Circuit Theory
A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to

R.m.s. voltage
Peak voltage
None of the listed here
Average voltage

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AC Fundamentals, Circuit and Circuit Theory
Which of the following statements pertains to resistors only?

Can dissipate considerable amount of power
Connecting them in parallel increases the total value
Can act as energy storage devices
Oppose sudden changes in voltage

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AC Fundamentals, Circuit and Circuit Theory
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

None of these
Both waves must have zero value at the same time
Both waves must have same frequency
Both waves must have identical peak values

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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?

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

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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

5 mA
15 mA
4 mA
9 mA

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