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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)/s.
 e-as.

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Electric Circuits
A wire 2.5 m long is bent into a square. An current of 100 A flowing through the wire will produce a magnetizing force at the center of the square, equal to

 72 AT / m.
 144 AT / m.
 196 AT / m.
 222 AT / m.

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Electric Circuits
In balanced bridge, if the positions of detector and source are interchanged, the bridge will still remain balanced. This can be explained from which theoem

 Compensation theorem
 Thevinin's theorem
 Norton's theorem
 Reciprocity theorem

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Electric Circuits
Time constant of RL series circuit is

 2L/R
 RC
 2RC
 L/R

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Electric Circuits
If one cycle of AC waveform occurs every millisecond, the frequency will be

 100 Hz.
 50 Hz.
 10 kHz.
 1000 Hz.

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Electric Circuits
For same voltage, the ratio resistance of 100 W lamp to resistance of 25 W lamp is

 16.
 1.
 1/4.
 4.

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MORE MCQ ON Electric Circuits

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