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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).
 se-as.
 e-as.
 (e-as)/s.

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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 phase angle of current in respect of supply voltage will be

 28.8o.
 20.2o.
 32.1o.
 40.4o.

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Electric Circuits
In the above question find the angle between voltage and current?

 30.
 60.
 90.
 54.74.

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Electric Circuits
Which of the following quantities remain the same in all parts of a parallel circuit

 voltage.
 power.
 resistance.
 current.

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Electric Circuits
Electric flux is proportional to

 rate of change of potential difference.
 rate of change of current.
 resistivity of medium.
 potential difference between electrodes.

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Electric Circuits
If a resistor and an inductor are connected in series across a voltage source. Which two parameters in that circuit decrease if frequency of voltage source increases?

 VL and VR.
 Z and I.
 VR and I.
 VL and Z.

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