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Electric Circuits

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

 4.
  2.
  0.5.
 0.25.

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Electric Circuits
The average value of half wave rectified sinusoidal current waveform, whose maximum value is 1A is

 1 A.
 0.318 A.
 0.5 A.
 0.637 A.

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

 Circle
 Triangle
 Straight line
 Semicircle

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Electric Circuits
Reciprocity condition for h parameters is

 h12 = - h21.
 h12 = h21.
 h11h22 - h21h12 = 0.
 h12 = h21.

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Electric Circuits
To apply reciprocity theorem response to excitation ratio is

 Mho.
 No units.
 Ohm.
 Either Ohm or Mho.

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Electric Circuits
Three identical resistor are connected in star across a 3 phase 550 V supply dissipating a total power of 300 W the line current is ____________ A.

 0.5
 2.56
 1
 3.149

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