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Electric Circuits

Electric Circuits
Two sinusoidal quantities are said to be in phase quadrature, when their phase difference is

 0o.
 45o.
 30o.
 90o.

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

 increases.
 decreases.
 increases exponentially.
 remains constant.

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Electric Circuits
Which of the following has least resistivity?

 Mercury.
 Copper.
 Aluminium.
 Lead.

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Electric Circuits
In which braking back emf exceeds supply voltage?

  None of these.
  Regenerative.
  Dynamic.
  Plugging.

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Electric Circuits
Four resistances 80 Ohm, 50 Ohm, 25 Ohm and R are connected in parallel. Current through 25 Ohm resistance is 4A. Total current of supply is 10A. The value of R will be

 36.36.
 66.66.
 40.25.
 76.66.

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Electric Circuits
The delta equation of given star connected impedance ZQR is equal to

 40 Ω.
 (20 + j10) Ω.
 (5 + j10 / 3) Ω.
  (10 + j30) Ω.

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