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Electric Circuits

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

 All of above.
 Current.
 Power factor.
 Voltage.

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Electric Circuits
Addition of which of the following substance in electrolyte helps in producing bright finish?

 Phenol.
 Glycerine.
 Any of above.
 Dextrol.

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Electric Circuits
In a delta network each element has value R. The value of each element in equivalent star network will be

 R / 2.
 R / 4.
 R / 6.
  R / 3.

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Electric Circuits
A balanced delta connected load has an impedance of 9∠30o Ω per phase. What is the impedance per phase of its equivalent star?

 27∠30o Ω
 30∠30o Ω.
None of these
 3∠30o Ω.

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Electric Circuits
A variable capacitance is one whose capacitance

 changes with temperature.
 changes with voltage.
 can be changed manually or by mechanical force.
 changes with time.

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Electric Circuits
Four resistances 80 Ohm, 50 Ohm, 25 Ohm and R are connected in parallel. Current through 25 Ohm resistance is 4A. Total current of supply is 10A. The value of R will be

 40.25.
 36.36.
 66.66.
 76.66.

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