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Electric Circuits

Electric Circuits
The active and reactive power in an AC circuit are 10W and 20VAR respectively. What is the power factor?

 0.866.
 0.5.
 0.577.
 1.

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Electric Circuits
Five cells are connected in series in a row and then four such rows are connected in parallel to Feed the current to a resistive load of 1.25Ω. Each cell has an emf of 1.5 V with internal resistance Of 0.2Ω. The current through the load will be

 23.33 A
 5 A
 1 A
 3.33 A

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Electric Circuits
To reduce hysteresis loss, we use

 laminated sheets.
 soft-iron.
 CRGO steel.
 copper bars.

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Electric Circuits
Aluminium is produced from bauxite by

  electrolytic process.
  rotating.
  oxidation.
  froth flotation.

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Electric Circuits
To find the initial value of a function, the highest power of S in denominator should be ---------- the highest power of S in the numerator.

 both a and c
 greater than
 equals to
 less than

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Electric Circuits
A 10Ω resistor is stretched to increase its length double. Its resistance will now be

 20 Ω.
 40 Ω.
 10 Ω.
 5 Ω.

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