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Electric Circuits

Electric Circuits
Which of the following may be value of resistivity of copper?

 1.7 X 10 - 6.
 1.7 X 10 - 5.
 1.7 X 10 - 4.
 1.7 X 10 - 3.

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Electric Circuits
The frequency of EMF generated by a generator depends upon its

 number of poles.
 speed.
 nature of supply.
 both speed and number of poles.

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Electric Circuits
In delta connected circuit when one resistor is open, then power will be

 0.
 increased by factor of 3.
  remain unchanged.
 reduced by the factor of 3.

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Electric Circuits
Zinc cadmium and lead coating is generally provided for

  decoration.
  corrosion.
  all of above.
  electrical contacts.

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Electric Circuits
Purpose of using capacitor is / are

 all of these.
 to do phase split in AC 1 phase motor.
 effect DC filter in electronic circuit.
 increase p.f of inductive load circuit.

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Electric Circuits
A capacitor passes a current of 12.6 mA when supplied with 20 V ac with a frequency of 1000 Hz. The capacitance will be

 1 μF.
 0.001 μF.
 0.1 μF.
 0.01 μF.

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