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Electric Circuits

Electric Circuits
For occurrence of resonance which of the following elements are required?

 Both 2 and 3
 C
 L
 R

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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.
  5 A.
  50 A.
  zero.

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Electric Circuits
A branch of a network is said to be active when it consists of one

 capacitor.
 resistor.
 voltage source.
 inductor.

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Electric Circuits
Capacitor does not allow the sudden change of

 current
 power
 voltage
None of these

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Electric Circuits
Which battery is used in aeroplanes?

 Dry cell battery.
 None of them.
 Lead acid battery.
 Edission cell.

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Electric Circuits
Purpose of using capacitor is / are

 increase p.f of inductive load circuit.
 all of these.
 effect DC filter in electronic circuit.
 to do phase split in AC 1 phase motor.

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