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Electric Circuits

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

 Power factor.
 All of above.
 Voltage.
 Current.

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Electric Circuits
If c1 = 8 μF, c2 = 4 μF, c3 = 7 μF c1, c2 are in series with c3 in parallel; effective capacitance will be

 2.21 μF.
 6 μF.
 3 μF.
 9.67 μF.

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Electric Circuits
A series circuit consists of R = 20 Ω, L = 20 mH, and AC supply 60 V with f = 100 Hz. The voltage drop across R is

 24.4 V .
  50.8 V.
 40.8 V.
  30.6 V.

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Electric Circuits
VRN, VYN and VBN are three phase voltage of a balanced three phase system. If VRN = 200∠30o V and VBN = 200∠- 90o V, then phase sequence of the system is

 RYB.
 RBY.
 BRY.
 YRB.

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Electric Circuits
Which battery is used in aeroplanes?

 Edission cell.
 None of them.
 Lead acid battery.
 Dry cell battery.

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Electric Circuits
Number of branches of a graph should be --------- number of branches of a network

 equals to
 less than
 greater than
 less than equals to

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MORE MCQ ON Electric Circuits

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