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Electric Circuits

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

 se-as.
 (e-as)/s.
 s(1-e-as).
 e-as.

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Electric Circuits
The inductive reactance of an electric circuit is 200 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 400 Ohms.
 200 Ohms.
 50 Ohms.
 100 Ohms.

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Electric Circuits
Electro-chemical equivalent is usually expressed in

  mg per volt.
  mg per kW.
  mg per kVA.
  mg per coulomb.

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Electric Circuits
The electrical conductivity of metal is typically of the order of (in ohm - m)

 107.
 10 - 6.
 105.
 10 - 4.

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Electric Circuits
A coil of negligible resistance has an induction of 100 mH. The current passing through the coil changes from 2 A to 4 A at a uniform rate in 0.1 sec the voltage across the coil during this time would be __________ V.

 36
 8
 2
 50

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Electric Circuits
Which resistor will be physically larger in size?

 1 k Ω, 1 W.
 10 Ω, 50 W.
 100 Ω, 10 W.
 1 M Ω, 1/2 W.

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