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Electric Circuits

Electric Circuits
For ideal tank circuit, what is the value of dynamic admittance?

 0
 Both
 ∞
None of these

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Electric Circuits
For Norton’s equivalent circuit

 Voc = Isc / Req.
 Isc = Voc Req.
 Isc = Voc / Req.
 Voc = Req /Isc.

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Electric Circuits
If a resistor and a capacitor are connected to form series R - C circuit across a voltage source. If frequency of voltage source increases

 the current decreases.
 the current decreases abruptly.
 the current increases.
 the current remain unaltered.

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Electric Circuits
A balanced delta connected load has an impedance of 9∠30o Ω per phase. What is the impedance per phase of its equivalent star?

 3∠30o Ω.
None of these
 30∠30o Ω.
 27∠30o Ω

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Electric Circuits
Phase voltages of a star connected alternator are ER = 240∠0o V, EY = 240∠-120o V and EB = 240∠ + 120o V. What is the phase sequence of the system?

 YBR.
 RBY.
 RYB.
 BYR.

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Electric Circuits
In a lead acid cell PbSO4 formed during

  discharging only.
  both during charging as well as discharging.
  charging only.
  neither during charging nor discharging.

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