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Electric Circuits

Electric Circuits
In the above question find the angle between voltage and current?

 54.74.
 60.
 30.
 90.

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Electric Circuits
Image impedance can be written by using short circuit impedance(Zsc)and open circuit impedance(Zoc) as

 Zsc-Zoc
 Zsc/Zoc
  (Zsc . Zoc)½
 Zsc+Zoc

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Electric Circuits
i) In star connection line current is equal to phase current. ii) In delta connection line voltage is equal to phase voltage. For a given phase connected to the particular line which of the statement is true ?

 Both (1) and (2).
 Only (1).
 None of these.
 Only (2).

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Electric Circuits
Time constant is the time taken for response to rise -------of maximum value?

 100%
 68.3%
 63.2%
 90%

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Electric Circuits
The switch S is the circuit shown in figure is ideal. If the switch is repeatedly closed for 1 ms and opened for 1 ms, the average value of i(t) is

 0.5 mA.
  0.25 mA.
 1 mA.
 0.35 mA.

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Electric Circuits
Addition of which of the following substance in electrolyte helps in producing bright finish?

 Any of above.
 Phenol.
 Glycerine.
 Dextrol.

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MORE MCQ ON Electric Circuits

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