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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?

 0.577.
 1.
 0.5.
 0.866.

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Electric Circuits
To obtain a high value of capacitance, the permittivity of dielectric medium should be

 zero
 low
 unity
 high

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Electric Circuits
Time constant of RL series circuit is

 L/R
 RC
 2L/R
 2RC

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Electric Circuits
Which cell has the reversible chemical reaction?

 Silver oxide.
 Mercury oxide.
 Carbon Zinc.
 Lead acid.

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Electric Circuits
Aluminium is produced from bauxite by

  oxidation.
  electrolytic process.
  rotating.
  froth flotation.

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Electric Circuits
Rms value is defined based on which of the following?

 Voltage
 Current
 Charge transfer
 Heating effect

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