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Electric Circuits

Electric Circuits
The Laplace Transform of a shifted unit step f (t) = U (t-a) is

 (e-as)/s.
 se-as.
 s(1-e-as).
 e-as.

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Electric Circuits
Total instantaneous power supplied by a 3 - φ AC supply to a balanced RL load is

 pulsating with non zero average.
 constant.
 zero.
 pulsating with zero average.

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Electric Circuits
A capacitor passes a current of 12.6 mA when supplied with 20 V ac with a frequency of 1000 Hz. The capacitance will be

 0.01 μF.
 1 μF.
 0.001 μF.
 0.1 μF.

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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 + j2 ) pu
 (3 + j4) pu
 (4 + j3) pu

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Electric Circuits
Which of the following carbon coded resistor has value of 10k ohm with 20% tolerance?

 Orange, orange, black and gold stripes.
 Brown, black, orange and no tolerance band.
 Red, red, green and silver stripes.
 Yellow, violet, yellow and silver stripes.

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Electric Circuits
Electric field intensity ( E ) at any point in an electric field is equal to

 ( potential gradient )1/2.
 ( potential gradient )2.
 potential gradient.
 ( potential gradient )1/3.

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