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Electric Circuits

Electric Circuits
The rms value of the voltage U(t)= 3 + 4cos(3t)

  5 V.
  4.123 V.
 {3 + 2(1.141)} V.
 7 V.

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Electric Circuits
An alternating voltage = 140 sinθ is supplied to a device which offers a resistance of 20 Ω in forward direction of current in reverse direction. Calculate the form factor.

 0.57.
 1.11.
 0.318.
 1.414.

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Electric Circuits
The fixed circular paths around the nucleus are called

 orbitals.
 orbits.
 nucleus.
 mesons.

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Electric Circuits
The internal resistance of lead acid cell is _______________ that of Edison cell.

 equal to.
 less than.
 more than.
 none of above.

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Electric Circuits
The synchronous speed for the seventh space harmonic mmf wave of 8 pole, 50 Hz induction machine will be

 107.14 rpm in forward direction.
 5250 rpm in reverse direction.
 107.14 rpm in reverse direction.
 5250 rpm in forward direction.

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Electric Circuits
In the figure, the potential difference between points P and Q is

 6 V.
 12 V.
 - 6 V.
 10 V.

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