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Electric Circuits

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

 Heating effect
 Charge transfer
 Voltage
 Current

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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

  5 A.
  zero.
  50 A.
  8.85 A.

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Electric Circuits
A p.d. of 300 V is applied across series combination of 3 μF and 9 μF capacitors. The charge on each capacitor is ___________________ μC.

 3600.
 675.
 240.
 7.5.

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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 √3 V.
 250 V.
 200 V.
 250 / √3 V.

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Electric Circuits
The life of a lead acid battery is expected to be

 2 to 5 years.
 1 year.
 6 months.
 10 to 15 years.

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Electric Circuits
An AC voltage of 200 V at 50 Hz is applied to a coil which draws 5 A and dissipates 1000 W. The resistance and impedance of the coil respectively are

 50 Ω and 200 Ω.
 40 Ω and 200 Ω.
 40 Ω and 40 Ω.
 25 Ω and 5 Ω.

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