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Electric Circuits

Electric Circuits
For the resonance circuit ω0 = 105, Q = 50, R = 400 Ω the value of C is

 1000 pF.
 125 pF.
 500 pF.
 250 pF.

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Electric Circuits
A 230V, 50Hz voltage is applied to a coil having L = 5H and R = 2 Ohm in series with capacitance C. When the voltage across the coil is 400V, find the value of C?

 4.78 µF.
 1.8 µF.
 8.51 µF.
 10.54 µF.

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Electric Circuits
A 3Ω resistor having 2A current will dissipate the power of

 2 W.
 4 W.
 12 W.
 8 W.

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Electric Circuits
For cadium plating electrolyte used is

 cadmium sulphate and sulphuric acid.
 cadmium hexa metaphosphate.
 any of above.
 sodium cyanide, cadmium and caustic soda.

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Electric Circuits
The inductive reactance of an electric circuit is 200 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 100 Ohms.
 400 Ohms.
 200 Ohms.
 50 Ohms.

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Electric Circuits
The capacitive reactance of a capacitor of (1 / 2μF) F at 103 Hz is

 10- 6 μF.
 10 3 μF.
 10- 3 μF.
 10 6 μF.

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