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Electric Circuits

Electric Circuits
The efficiency in case of maximum power transfer theorem is

 less than 50 %.
 50 % - 100 %.
 50 %.
 100 %.

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Electric Circuits
Which of following is the unit of magnetic flux density?

 Weber.
 Tesla.
 Lumens.
 Daraf.

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Electric Circuits
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?

 RBY.
 BYR.
 YBR.
 RYB.

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Electric Circuits
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?

  P.
 2P.
 16P.
 4P.

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Electric Circuits
In balanced bridge, if the positions of detector and source are interchanged, the bridge will still remain balanced. This can be explained from which theoem

 Thevinin's theorem
 Reciprocity theorem
 Norton's theorem
 Compensation theorem

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Electric Circuits
A capacitor of 50 microfarad is connected in series with a resistance of 120 Ω. If above circuit is connected across 240 V, 50 Hz 1 - φ supply. Find the capacitive reactance?

 1.765 Ω.
 135.86 Ω.
 63.7 Ω.
 0.015 Ω.

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