ELECTRIC CIRCUITS QUIZ

The switch S is the circuit shown in figure is ideal. If the switch is repeatedly closed for 1 ms and opened for 1 ms, the average value of i(t) is

1 mA.

0.25 mA.

0.5 mA.

0.35 mA.

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For the resonance circuit ω0 = 105, Q = 50, R = 400 Ω the value of C is

1000 pF.

125 pF.

250 pF.

500 pF.

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What is meant by the rate of flow of an electric charge?

Electric potential.

None of these

Electric current.

Electric resistance.

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The laplace transform of the fuction f(t) = t is

1/s.

s.

s2.

1/s2.

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A 230V, 50Hz voltage is applied to a coil having L = 5H and R = 2 Ohm in series with capacitance C. When the voltage across the coil is 400V, find the value of C?

10.54 µF.

4.78 µF.

8.51 µF.

1.8 µF.

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What is I1 in the given circuit?

3 A.

0.5 A.

1.5 A.

1 A.

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An equipotential surface is one which has all points at _____________ potential.

same.

different.

zero.

none of them.

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Phase voltages of a star connected alternator are ER = 240∠0o V, EY = 240∠-120o V and EB = 240∠ + 120o V. What is the phase sequence of the system?

BYR.

YBR.

RBY.

RYB.

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A reactance having an inductor of 0.15 H is connected in series with 10 Ω resistance. What will be the inductive reactance?

47.1 Ω.

None of these.

48.15 Ω.

1.5 Ω.

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An ideal constant voltage source has ___ internal impedance whereas a constant current source has internal impedance.

infinite, infinite

zero, zero

zero, infinite

infinite, zero

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