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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.
 e-as.
 se-as.

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Electric Circuits
Condition for a balanced 3 - phase load is that, each phase has the same value of __________________.

 impedance.
 all of these.
 resistance.
 power factor.

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Electric Circuits
A 35 V source is connected to a series circuit of 600 Ω and R as shown. If a voltmeter of internal resistance 1.2 kΩ is connected across 600 Ω resistor, it reads 5 V. The value of R is

 7.2 k Ω.
 2.4 k Ω.
 1.2 k Ω.
 3.6 k Ω.

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Electric Circuits
An AC voltage of 200 V at 50 Hz is applied to a coil which draws 5 A and dissipates 1000 W. The resistance and impedance of the coil respectively are

 25 Ω and 5 Ω.
 40 Ω and 200 Ω.
 50 Ω and 200 Ω.
 40 Ω and 40 Ω.

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Electric Circuits
Basic cut set matrix consists of

 no branches.
 one branch.
 2 branch.
 any number of branches.

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Electric Circuits
A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is

 50 ohms.
 1000 ohms.
 5000 ohms.
 500 ohms.

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MORE MCQ ON Electric Circuits

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