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Electric Circuits

Electric Circuits
A voltage of v = 100 sin (wt + π/3) is applied to pure resistor of 30 Ohm. What is the RMS value of current is

 1.92.
 5.77.
 2.36.
 4.71.

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Electric Circuits
Image impedance can be written by using short circuit impedance(Zsc)and open circuit impedance(Zoc) as

 Zsc/Zoc
 Zsc+Zoc
 Zsc-Zoc
  (Zsc . Zoc)½

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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

 unity.
 lagging.
 leading.
 zero.

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Electric Circuits
The electrical conductivity of metal is typically of the order of (in ohm - m)

 10 - 6.
 107.
 10 - 4.
 105.

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Electric Circuits
The inductive reactance of an electric circuit is 200 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 200 Ohms.
 400 Ohms.
 100 Ohms.
 50 Ohms.

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Electric Circuits
If the peak value of a sine wave is 100 V, then its RMS value will be

 100 V.
 63.6 V.
 88 V.
 70.7 V.

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