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Electric Circuits

Electric Circuits
When 125 V is applied across a 250 V, 100 W filament incandescent bulbs, the power consumption is

 100 W.
 12.5 W.
 50 W.
 25 W.

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Electric Circuits
Resistance of which material does not change with change in temperature?

 Tungsten.
 Brass.
 Platinum.
 Metal alloys constantan and manganin.

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Electric Circuits
An electrical motor has rating of 10 MVA at 0.8 lag, represented as series RL circuit at a 50 MVA base. Find the impedance value?

 (4 + j2 ) pu
 (4 + j3) pu
 (2 + j4) pu
 (3 + j4) pu

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Electric Circuits
Total power consumed in the circuit below is 10 W. Find X.

  2 A.
 1 A.
 None of these.
 3 A.

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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

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

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Electric Circuits
Three element having conductance G1, G2 and G3 are connected in parallel. Their combined conductance will be

 (1 / G1 + 1 / G2 + 1 / G3) - 1.
 (G1 + G2 + G3) - 1.
 G1 + G2 + G3.
 1 / G1 + 1 / G2 + 1 / G3.

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