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Electric Circuits

Electric Circuits
A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is

 50 ohms.
 5000 ohms.
 500 ohms.
 1000 ohms.

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Electric Circuits
A 60 Hz frequency voltage would cause a bulb to turn on and off

 80 times per second.
 70 times per second.
 120 times per second.
 60 times per second.

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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
When power factor angle is varying, the shape of the current locus is

 Semicircle
 Straight line
 Circle
 Triangle

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Electric Circuits
The ratio of the resistance of a 200 W, 230 V lamp to that of a 100 W, 115 V lamp will be

 0.25.
  0.5.
 4.
  2.

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Electric Circuits
In question no.3, which of the following is true ?

 ic (0+) = i(0+).
 None of these.
 i(0+)= iL(0+).
 iL(0) = ic (0).

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