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Electric Circuits

Electric Circuits
In the circuit given, I = 1 A for Is = 0. What is the value of I for Is = 2 A ?

  2 A.
 4 A.
 3 A.
 1 A.

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Electric Circuits
2) Two sinusoidal emfs are given as e1 = Asin(wt+45) and e2 = Bsin(wt-30). The phase difference between the two quantities in degrees is

 105.
 15.
 75.
 60.

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Electric Circuits
The maximum value of a current wave is 2A. If the form factor of a current wave is 1.5 and the peak factor is 2.7, find the rms value in Amperes.

 0.741 A.
 1.414 A.
 1.57 A.
 0.494 A.

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Electric Circuits
The frequency of EMF generated by a generator depends upon its

 number of poles.
 both speed and number of poles.
 speed.
 nature of supply.

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Electric Circuits
Which part of magnetic path requires largest mmf?

 Inductance.
 Core.
 Coil.
 Air gap.

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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 voltage drop across L is

  39.1 V.
 50.5 V.
  31.9 V.
 45.5 V.

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