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Electric Circuits

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

 Power factor.
 Voltage.
 Current.
 All of above.

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Electric Circuits
Open circuit voltage of a fully charged lead acid cell is

 2 V.
 2.5 V.
 1.9 V.
 2.7 V.

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Electric Circuits
A p.d. of 300 V is applied across series combination of 3 μF and 9 μF capacitors. The charge on each capacitor is ___________________ μC.

 675.
 3600.
 240.
 7.5.

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Electric Circuits
A capacitor of 50 microfarad is connected in series with a resistance of 120 Ω. If above circuit is connected across 240 V, 50 Hz 1 - φ supply. Find the capacitive reactance?

 135.86 Ω.
 63.7 Ω.
 1.765 Ω.
 0.015 Ω.

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Electric Circuits
Electrics supply for electroplating should be

 low frequency ac voltage.
 any of above.
 DC voltage.
 low AC voltage.

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Electric Circuits
Which of following is the unit of magnetic flux density?

 Weber.
 Daraf.
 Lumens.
 Tesla.

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