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Electric Circuits

Electric Circuits
Coating generally recommended for hard surfacing is

None of these
 chromium plating.
 lead plating.
 copper plating.

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Electric Circuits
The energy stored by a capacitor is given by

 1/2 CV2.
 1/2 QV.
 Q2 / 2C.
 all of them.

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Electric Circuits
An electrical motor has rating of 10 MVA at 0.8 lag, represented as series RL circuit at a 50 MVA base. Find the impedance value?

 (2 + j4) pu
 (4 + j3) pu
 (3 + j4) pu
 (4 + j2 ) pu

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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

 45.5 V.
 50.5 V.
  31.9 V.
  39.1 V.

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Electric Circuits
In series RLC circuit what is the power factor just bellow the resonance frequency?

 Unity
 Leading
 Zero
 Lagging

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Electric Circuits
A current in a circuit is given by, If the current flows through the 5 Ω resistor, find power dissipated at t = 0?

 20 Watts.
 15 Watts.
 40 Watts.
 10 Watts.

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