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Electric Circuits

Electric Circuits
Reciprocity condition for h parameters is

 h12 = h21.
 h12 = h21.
 h12 = - h21.
 h11h22 - h21h12 = 0.

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Electric Circuits
What is the SI unit of electric current ?

 Faraday.
 Ampere.
None of these
 Ohm.

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Electric Circuits
To reduce hysteresis loss, we use

 soft-iron.
 laminated sheets.
 copper bars.
 CRGO steel.

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Electric Circuits
A capacitor is connected to supply with switch and the switch is connected between capacitor and supply. Initially switch is open at time zero, and then switch is closed. Then how capacitor behaves at time t = 0+?

 short circuit.
 open circuit.
 dielectric losses decreases.
 dielectric losses increases.

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Electric Circuits
The efficiency in case of maximum power transfer theorem is

 50 % - 100 %.
 100 %.
 less than 50 %.
 50 %.

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Electric Circuits
The resistance of 200 W, 200 V lamp is

  200 Ω.
 800 Ω.
 400 Ω.
 100 Ω.

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