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Electric Circuits

Electric Circuits
If one cycle of AC waveform occurs every millisecond, the frequency will be

 50 Hz.
 100 Hz.
 10 kHz.
 1000 Hz.

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Electric Circuits
The inductive reactance of an electric circuit is 200 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 50 Ohms.
 400 Ohms.
 100 Ohms.
 200 Ohms.

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

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

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Electric Circuits
Which of following is invariably seen in an electroplating plant?

  Barrel.
  Carbon brushes.
  Rectifier.
  Distilled water.

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Electric Circuits
The resistance of 200 W, 200 V lamp is

 800 Ω.
 400 Ω.
  200 Ω.
 100 Ω.

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Electric Circuits
Two wires of A and B of the same material and length ‘l’ and ‘2l’ have radius ‘r’ and ‘2r’ respectively. The ratio of their specific resistance will be

 1:2.
 1:8.
 4:1.
 1:1.

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