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Electric Circuits

Electric Circuits
In direct arc furnace which of following is of high value?

 Current.
 Power factor.
 All of above.
 Voltage.

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Electric Circuits
The switch S is the circuit shown in figure is ideal. If the switch is repeatedly closed for 1 ms and opened for 1 ms, the average value of i(t) is

 0.35 mA.
 1 mA.
  0.25 mA.
 0.5 mA.

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Electric Circuits
A 3Ω resistor having 2A current will dissipate the power of

 2 W.
 4 W.
 8 W.
 12 W.

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Electric Circuits
In RC series circuit R = 2Ω, C = 2μF and 10V dc is applied. Then what is the value of current?

 10A
 2A
 0A
 5A

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Electric Circuits
The active and reactive power in an AC circuit are 10W and 20VAR respectively. What is the power factor?

 0.866.
 1.
 0.577.
 0.5.

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Electric Circuits
If one cycle of AC waveform occurs every millisecond, the frequency will be

 50 Hz.
 10 kHz.
 1000 Hz.
 100 Hz.

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