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Electric Circuits

Electric Circuits
Three 3Ω resistors are connected to form a triangle. What is the resistance between any two of the corner?

 9 Ω.
 3 Ω.
 6 Ω.
  2 Ω.

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Electric Circuits
A series circuit consists of R = 20 Ω, L = 20 mH, and AC supply 60 V with f = 100 Hz. The phase angle of current in respect of supply voltage will be

 28.8o.
 40.4o.
 20.2o.
 32.1o.

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Electric Circuits
Instantaneous power in inductor is proportional to the

 square of instantaneous current.
 square of the rate of change of current.
 product of the instantaneous current and rate of change of current.
 temperature of the inductor.

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Electric Circuits
The resistance of 100 W, 200 V lamp is

 400 Ω.
 200 Ω.
 1600 Ω.
 800 Ω.

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Electric Circuits
A current of 4 A flows in an ac circuit when 100 V dc is applied to it whereas it takes 250 v ac to produce the same current the power factor of the circuit is

 0.4.
 0.85.
 10.
 1.

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Electric Circuits
Highest current density is usually recommended for

  tin plating.
  chromium plating.
  cadmium plating.
  bronze plating.

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