ELECTRIC CIRCUITS QUIZ

Two equal resistors R connected in series across a voltage source V dissipate power P. What would be the power dissipated in the same resistors when they are connected in parallel across the same voltage source?

2P.

16P.

4P.

P.

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A 3 wire, 3 - φ supply feeds a load consisting of three equal resistors. By how much is the load reduced if one of the resistors be removed when the load is in star?

33.33 % of the original load.

66.66 % of the original load.

25 % of the original load.

50 % of the original load.

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Rms value is defined based on which of the following?

Current

Voltage

Heating effect

Charge transfer

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Which of the following may be value of resistivity of copper?

1.7 X 10 - 6.

1.7 X 10 - 5.

1.7 X 10 - 4.

1.7 X 10 - 3.

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Cells are connected in parallel in order to increase

life of the cells.

efficiency.

current capacity.

voltage rating.

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Ampere second is the unit of

energy.

conductance.

power.

charge.

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A balanced star connected load with impedance of 30j - 300 Ω is supplied from a 3 - phase, 4-wire, 173 V system, the voltages to neutral being 100j -900, 100j - 300 and 100j -1500 V. The current in neutral wire is

zero.

5 A.

8.85 A.

50 A.

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Two resistances R1 and R2 give combined resistances 4.5 Ω and 1 Ω when they are connected in series and parallel respectively. What would be the values of these resistances?

1.5 Ω and 3 Ω.

3 Ω and 6 Ω.

3 Ω and 9 Ω.

6 Ω and 9 Ω.

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When power factor angle is constant, then shape of the current locus is

straight line.

circle.

semi circle.

triangle.

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In ideal system coefficient of coupling(k) is

0

1

∞

Both 2 and 3

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