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Electric Circuits

Electric Circuits
Aluminium is produced from bauxite by

  electrolytic process.
  rotating.
  froth flotation.
  oxidation.

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Electric Circuits
If a resistor and an inductor are connected in series across a voltage source. Which two parameters in that circuit decrease if frequency of voltage source increases?

 Z and I.
 VL and VR.
 VR and I.
 VL and Z.

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Electric Circuits
Instantaneous power in inductor is proportional to the

 square of the rate of change of current.
 product of the instantaneous current and rate of change of current.
 square of instantaneous current.
 temperature of the inductor.

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Electric Circuits
Which of the following carbon coded resistor has value of 10k ohm with 20% tolerance?

 Orange, orange, black and gold stripes.
 Yellow, violet, yellow and silver stripes.
 Brown, black, orange and no tolerance band.
 Red, red, green and silver stripes.

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Electric Circuits
A capacitor is charged by a constant 10 mA current sources which is turned on for 1 second. Assuming the capacitor is initially charge free; determine the charge delivered to and the power supplied by the source if the capacitor has a value of 1 mF.

 0.01C, 10MW.
 0.1C, 100MW.
 0.01C and 5W.
 0.1C, 10MW.

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Electric Circuits
A star connected load has three equal impedance each of (40 + j30) Ω If the line current is 5 A then value of line voltage is

 250 V.
 200 V.
 250 √3 V.
 250 / √3 V.

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