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Electric Circuits

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

 s(1-e-as).
 (e-as)/s.
 se-as.
 e-as.

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Electric Circuits
The active and reactive power in an AC circuit are 10W and 20VAR respectively. What is the power factor?

 0.5.
 0.866.
 0.577.
 1.

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Electric Circuits
Absolute permittivity of dielectric medium is represented as

 ε0
 εr/ε0
 εrε0
 εr

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Electric Circuits
In a capacitor, the electrical energy is stored in

 magnetic field.
 none of above.
 both ‘electric field’ and magnetic field’.
 electric field.

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Electric Circuits
A circuit contains two unequal resistor in parallel

 currents in both are same.
 voltage drops are according to their resistive value.
 heat losses in both are same.
 voltage drops across both are same.

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Electric Circuits
Third pin of a 3 pin plug is thicker and longer

 for protection purpose.
 for designing purpose.
 none of these.
 all pins are of same size.

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