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Electric Circuits

Electric Circuits
Time constant is the time taken for response to rise -------of maximum value?

 100%
 68.3%
 63.2%
 90%

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Electric Circuits
The arrangement of 12 cells each of internal resistance 1.5 Ohm to give maximum current in external load resistance of 2 Ohm will be

 all 12 in series.
 in 4 parallel rows each row having 3 cells in series.
 in 3 parallel rows each row having 4 cells in series.
 all 12 in parallel.

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Electric Circuits
A 60 Hz frequency voltage would cause a bulb to turn on and off

 80 times per second.
 120 times per second.
 60 times per second.
 70 times per second.

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Electric Circuits
If N is the number of nodes and b is the number of branches in a network, then rank of tie set matrix is

 b - N - 1.
 N.
 b - N + 1.
 N - 1.

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Electric Circuits
A wire 2.5 m long is bent into a square. An current of 100 A flowing through the wire will produce a magnetizing force at the center of the square, equal to

 222 AT / m.
 144 AT / m.
 72 AT / m.
 196 AT / m.

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Electric Circuits
R1 = 36 Ω and R2 = 75 Ω, each having tolerance of ±5% are connected in series. The value of resultant resistance is

  111 ± 0 Ω.
 111 ± 2.77 Ω.
  111 ± 5.55 Ω.
 111 ± 7.23 Ω.

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