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Electric Circuits

Electric Circuits
Time constant of RL series circuit is

 2RC
 L/R
 RC
 2L/R

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Electric Circuits
For balanced star load, if unbalanced line current are IR, IY, IB equal to - j10, - j10 and - j20 respectively, the neutral current will be equal to

  (8.66 - j5) A.
  (8.66 + j5) A.
  (-8.66 - j5) A.
  (-9.66 + j5) A.

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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+?

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

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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 current in the circuit?

 0.2547 A.
 0.4583 A.
 0.1465 A.
 0.1578 A.

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Electric Circuits
Whenever current is supplied by a source its terminal voltage

 remains constant.
 increases.
 decreases.
 increases exponentially.

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Electric Circuits
Disadvantages of constant k type filter

  none of these.
  both A and B.
  characteristic impedance unchanged in pass band.
  attenuation does not increase rapidly beyond cut off frequency.

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