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Electric Circuits

Electric Circuits
Air gap flux density is of the order of

  0.35 - 0.5 T.
  0.65 - 0.9 T.
 0.75 - 0.8 T.
 0.85 - 0.9 T.

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Electric Circuits
A balanced 3 - φ star connected load is fed from a 208 V, 3 - φ supply. Each load has resistance of 35 Ω. The total power is

 618 W.
 none of these.
 411.3 W.
 1236 W.

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

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

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Electric Circuits
The plates of lead acid storage battery are most likely to be short circuited if

 sediment collect at the bottom of the battery.
 the electrolyte evaporates.
 too much water is added.
 the battery charged too slowly.

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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.
 27∠30o Ω
None of these
 30∠30o Ω.

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Electric Circuits
Electric flux is proportional to

 resistivity of medium.
 potential difference between electrodes.
 rate of change of current.
 rate of change of potential difference.

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