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Electric Circuits

Electric Circuits
A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is

 500 ohms.
 1000 ohms.
 50 ohms.
 5000 ohms.

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Electric Circuits
The value of unity impulse function at time (t) = 0 is

 1.
 infinite.
 indeterminate.
 0.

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Electric Circuits
The electrical conductivity of metal is typically of the order of (in ohm - m)

 105.
 10 - 4.
 107.
 10 - 6.

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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.
 0.015 Ω.
 63.7 Ω.
 1.765 Ω.

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Electric Circuits
Which of the following is not equivalent to watts?

 Ampere-volts.
 Amperes/volt.
 Joules per second.
 Ampere2 – Ohm.

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

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

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