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Electric Circuits

Electric Circuits
In series RLC circuit, voltage across resistor, inductor and capacitor are 5V, 2V and 2V respectively. Find total voltage?

 9V
 5V
 4V
 2V

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Electric Circuits
Phase voltages of a star connected alternator are ER = 240∠0o V, EY = 240∠-120o V and EB = 240∠ + 120o V. What is the phase sequence of the system?

 RBY.
 RYB.
 BYR.
 YBR.

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Electric Circuits
The synchronous speed for the seventh space harmonic mmf wave of 8 pole, 50 Hz induction machine will be

 107.14 rpm in reverse direction.
 5250 rpm in reverse direction.
 5250 rpm in forward direction.
 107.14 rpm in forward direction.

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Electric Circuits
When power factor angle is constant, then shape of the current locus is

 circle.
 semi circle.
 triangle.
 straight line.

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Electric Circuits
In active filter which element is absent?

 Capacitor.
 Both of above.
 Resistor.
 Inductor.

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Electric Circuits
For balanced star load, if unbalanced line current are IR, IY, IB equal to - j10, - j10 and - j20 respectively, the neutral current will be equal to

  (8.66 + j5) A.
  (-8.66 - j5) A.
  (8.66 - j5) A.
  (-9.66 + j5) A.

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