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Electric Circuits

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

 0.577.
 1.
 0.866.
 0.5.

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Electric Circuits
For balanced star load, if unbalanced line current are IR, IY, IB equal to - j10, - j10 and - j20 respectively, the neutral current will be equal to

  (8.66 - j5) A.
  (-8.66 - j5) A.
  (8.66 + j5) A.
  (-9.66 + j5) A.

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Electric Circuits
In RLC series circuit, if the voltage across capacitor is greater than voltage across inductor, then power factor of the network is

 leading.
 unity.
 lagging.
 zero.

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Electric Circuits
The norton equivalent of the circuit shown in the figure is

 1A, 1.5 Ohm
 0.75A, 5/6 Ohm
 1A, 5/6 Ohm
 0.75 A, 1.5 Ohm

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Electric Circuits
The capacitive reactance of an electric circuit is 50 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 200 Ohms.
 50 Ohms.
 25 Ohms.
 100 Ohms.

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Electric Circuits
Which resistor will be physically larger in size?

 10 Ω, 50 W.
 100 Ω, 10 W.
 1 M Ω, 1/2 W.
 1 k Ω, 1 W.

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