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Electric Circuits

Electric Circuits
The rms value of sine wave is 100 A. Its peak value is

 141.4 A.
 282.8 A.
 150 A.
 70.7 A.

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Electric Circuits
A cube of material of side 1 cm has a resistance of 0.002 Ω between its opposite faces. If the same volume of the material has a length of 4 cm and a uniform cross - section, the resistance of this length will be

  0.032 Ω.
 0.064 Ω.
  0.128 Ω.
 0.016 Ω.

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Electric Circuits
A capacitor is charged by a constant 10 mA current sources which is turned on for 1 second. Assuming the capacitor is initially charge free; determine the charge delivered to and the power supplied by the source if the capacitor has a value of 1 mF.

 0.1C, 10MW.
 0.01C and 5W.
 0.1C, 100MW.
 0.01C, 10MW.

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Electric Circuits
A two port network is defined by the relation The value of Z12 is

 2/31.
 -3.
 3.
 3/41.

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Electric Circuits
The hot resistance of a tungsten lamp is about 10 times the cold resistance. Accordingly, cold resistance of a 100 W, 200 V lamp will be

 400 Ω.
 4 Ω.
  40 Ω.
 800 Ω.

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Electric Circuits
Air gap flux density is of the order of

  0.65 - 0.9 T.
 0.85 - 0.9 T.
 0.75 - 0.8 T.
  0.35 - 0.5 T.

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