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

  50 A.
  zero.
  5 A.
  8.85 A.

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Electric Circuits
What is called the instantaneous value of an alternating current?

 The value of alternating frequency at any instant.
 The value of peak current at any instant.
 The value of alternating quantity at any instant.
 The value of peak quantity at any instant.

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