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Electric Circuits

Electric Circuits
In a capacitor the electric charge is stored in

 metal plates.
 both of (A) and (B).
 none of above.
 dielectric.

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Electric Circuits
Which resistor will be physically larger in size?

 10 Ω, 50 W.
 100 Ω, 10 W.
 1 M Ω, 1/2 W.
 1 k Ω, 1 W.

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Electric Circuits
Energy efficiency during electroplating is usually in the range

 90 to 99%.
 80 to 85%.
 85 to 90%.
 50 to 80%.

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Electric Circuits
A coil of negligible resistance has an induction of 100 mH. The current passing through the coil changes from 2 A to 4 A at a uniform rate in 0.1 sec the voltage across the coil during this time would be __________ V.

 8
 50
 36
 2

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Electric Circuits
Three identical inductors are connected in delta with a 220 V, 50 Hz, 3 - φ, supply. If the phase current is 24 A, then what is the value of each of the inductance?

 0.029.
 0.049 H.
 None of these.
 0.058 H.

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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

 66.66.
 76.66.
 36.36.
 40.25.

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