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Electric Circuits

Electric Circuits
Capacitors for P.f correction are rated in

 KVA.
 KV.
 KVAR.
 KW.

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Electric Circuits
A 50 μF capacitor is charged to retain 10 MJ of energy by a constant charging current of 1 A. Determine the voltages across the capacitor?

 50 V.
 30 V.
 20 V.
 60 V.

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Electric Circuits
In RL series circuit R=2Ω and L=2mH. What is the value of time constant?

 2msec
 100sec
 1msec
 4msec

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Electric Circuits
Which of following is the unit of magnetic flux density?

 Weber.
 Tesla.
 Daraf.
 Lumens.

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Electric Circuits
What is apparent power in AC operation?

 Product of voltage and current at no load.
 Product of rms voltage and rms current.
 Product of voltage and current at full load.
 Product of voltage and current.

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Electric Circuits
Which of the following are typical resistance and power-dissipation values for a carbon-composition resistor?

 1000000 ohms, 1 W.
 5000 ohms, 100W.
 10 ohm, 50 W.
 10000 ohms, 10 W.

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