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Electric Circuits

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

 e-as.
 se-as.
 s(1-e-as).
 (e-as)/s.

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Electric Circuits
Which battery is used in aeroplanes?

 Dry cell battery.
 Lead acid battery.
 None of them.
 Edission cell.

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Electric Circuits
A motor having a power factor of 0.8 absorbs in active power of 1200 W the reactive power drawn from the supply is _________ VA.

 250
 130
 900
 400

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Electric Circuits
Two resistances R1 and R2 give combined resistances 4.5 Ω and 1 Ω when they are connected in series and parallel respectively. What would be the values of these resistances?

  1.5 Ω and 3 Ω.
  3 Ω and 6 Ω.
 3 Ω and 9 Ω.
 6 Ω and 9 Ω.

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Electric Circuits
Which of the following is not a bilateral element?

 Resistor.
 Capacitor.
 Inductor.
 Diode.

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Electric Circuits
Which of the following materials has highest electrical conductivity ?

  Silver.
  Aluminium.
  Copper.
  Steel.

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MORE MCQ ON Electric Circuits

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