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Electric Circuits

Electric Circuits
In RL series circuit R=2Ω and L=2mH. What is the value of time constant?

 4msec
 1msec
 100sec
 2msec

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Electric Circuits
In which braking back emf exceeds supply voltage?

  Dynamic.
  Regenerative.
  Plugging.
  None of these.

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Electric Circuits
Which of following is invariably seen in an electroplating plant?

  Rectifier.
  Carbon brushes.
  Barrel.
  Distilled water.

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Electric Circuits
Atoms with fewer than 4 valence electrons are

 none of these.
 insulator.
 conductor.
 semi-conductor.

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Electric Circuits
A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then voltage across each resistor is

 halved.
 remain same.
 doubled.
 increase by two times.

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Electric Circuits
A wire of resistance R has it length and cross - section both doubled. Its resistance will become

 0.5R.
 R.
 4R.
 2R.

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MORE MCQ ON Electric Circuits

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