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Electric Circuits

Electric Circuits
When power factor angle is varying, the shape of the current locus is

 Circle
 Semicircle
 Triangle
 Straight line

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Electric Circuits
A balanced star connected load with impedance of 30j - 300 Ω is supplied from a 3 - phase, 4-wire, 173 V system, the voltages to neutral being 100j -900, 100j - 300 and 100j -1500 V. The current in neutral wire is

  8.85 A.
  50 A.
  5 A.
  zero.

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Electric Circuits
Which cell has the reversible chemical reaction?

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

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Electric Circuits
What is the unit of potential difference ?

 Watt
 Ohm
 Volt
 Ampere

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Electric Circuits
Highest current density is usually recommended for

  bronze plating.
  chromium plating.
  cadmium plating.
  tin plating.

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Electric Circuits
What is the value of charge of an electron?

 1.6022 × 10-19 Coulomb
 1.6022 × 10-8 Coulomb
 1.6022 × 10-27 Coulomb
 1.6022 × 10-7 Coulomb

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