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Electric Circuits

Electric Circuits
In direct arc furnace which of following is of high value?

 Current.
 Voltage.
 Power factor.
 All of above.

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Electric Circuits
Two wires of A and B of the same material and length ‘l’ and ‘2l’ have radius ‘r’ and ‘2r’ respectively. The ratio of their specific resistance will be

 1:1.
 1:2.
 4:1.
 1:8.

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Electric Circuits
What will be the resistance if 10 resistors of 10 ohm each are connected in series?

 100 Ω.
 10 Ω.
 0.1 Ω.
 1 Ω.

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Electric Circuits
For occurrence of resonance which of the following elements are required?

 R
 Both 2 and 3
 C
 L

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Electric Circuits
A capacitor has a capacitance of 6 μF. Calculate the stored energy in it if a DC voltage of 100 V, is applied across it?

 4 × 102 joules.
 6 × 102 joules.
 3 × 102 joules.
 2.5 × 102 joules.

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Electric Circuits
Zinc cadmium and lead coating is generally provided for

  corrosion.
  all of above.
  decoration.
  electrical contacts.

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