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Electric Circuits

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

 Current.
 All of above.
 Power factor.
 Voltage.

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Electric Circuits
200 resistors of 200 Ω each are connected in parallel. Their equivalent resistance will be

 400 Ω.
 200 Ω.
 1 Ω.
 4 kΩ.

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Electric Circuits
The rms value of sine wave is 100 A. Its peak value is

 70.7 A.
 282.8 A.
 141.4 A.
 150 A.

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Electric Circuits
Active materials of a lead acid cell are

 spongy lead.
 dilute H2SO4.
 all of above.
 lead peroxide.

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Electric Circuits
The capacitance of a parallel plate capacitor can be varied by

 changing the dielectric medium only.
All of these
 changing the overlapping area of the plates only.
 changing the distance between the plates only.

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Electric Circuits
An electrical motor has rating of 10 MVA at 0.8 lag, represented as series RL circuit at a 50 MVA base. Find the impedance value?

 (4 + j2 ) pu
 (4 + j3) pu
 (3 + j4) pu
 (2 + j4) pu

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