ELECTRIC CIRCUITS QUIZ

What is represented by the hypotenuse of impedance triangle?

Apparent power.

Resistance drop.

Reactance drop.

Impedance drop.

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The internal resistance of a dry cell is of the order of

1 to 1.5 Ohm.

0.2 to 0.4 Ohm.

1 to 15 Ohm.

2 to 5 Ohm.

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A 3 – φ delta connected symmetrical load consumes P Watts of power from a balanced supply. If the same load is connected in star to the same supply then what is the power consumption?

3P.

√3P.

P/3.

P.

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A series RLC circuit is connected across a 240V, 50 Hz supply. When the voltage across capacitor is 250V, a maximum current of 0.5A flows in the circuit. Find the inductance.

2.25 µF.

0.47 µF.

6.37 µF.

1.58 µF.

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A 100 μF capacitor supplied from 3 V source with a frequency of 50 Hz. The capacitive reactance is

31.84 Ω.

15.92 Ω.

7.96 Ω.

63.68 Ω.

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The resistance of 200 W, 200 V lamp is

100 Ω.

200 Ω.

400 Ω.

800 Ω.

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The capacitive reactance of an electric circuit is 50 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

200 Ohms.

25 Ohms.

100 Ohms.

50 Ohms.

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In the circuit shown below, what is the voltage across 5 Ω resistor?

None of them

-28.4 V.

34.4 V.

-27.4 V.

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Which of the following is not equivalent to watts?

Amperes/volt.

Ampere-volts.

Joules per second.

Ampere2 – Ohm.

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For symmetrical wave form average value of one full cycle is

1

1.11

0

2.22

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