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Electric Circuits

Electric Circuits
What is the SI unit of electric current ?

 Ampere.
 Faraday.
 Ohm.
None of these

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Electric Circuits
An ideal constant voltage source has _______________ internal impedance whereas a constant current source has ____________ internal impedance.

 infinite, zero
 infinite, infinite
 zero, zero
 zero, infinite

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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

  zero.
  5 A.
  8.85 A.
  50 A.

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Electric Circuits
In series R, L circuit power factor can be defined as

 Vr/V
 R/Z
 P/S
All of these

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Electric Circuits
Energy efficiency during electroplating is usually in the range

 50 to 80%.
 80 to 85%.
 90 to 99%.
 85 to 90%.

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Electric Circuits
In the circuit shown in figure if I1 = 1.5 A, then I2 will be

 2 A.
 0.5 A.
 1.5 A.
 1 A.

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