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Electric Circuits

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 230V, 50Hz voltage is applied to a coil having L = 5H and R = 2 Ohm in series with capacitance C. When the voltage across the coil is 400V, find the value of C?

 8.51 µF.
 1.8 µF.
 4.78 µF.
 10.54 µF.

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Electric Circuits
A rectangular magnet of magnetic moment M is cut into two pieces of same length. The magnetic moment of each piece will be

 2 M.
 M / L.
 M.
 M / 2.

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Electric Circuits
Given network is having N nodes and B branches, then number of twigs are

 N - 1.
 N.
 B - N - 1.
 B - N + 1.

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Electric Circuits
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?

 66.66 % of the original load.
 50 % of the original load.
 25 % of the original load.
 33.33 % of the original load.

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Electric Circuits
A constant current source supplies a electric current of 300 mA to a load of 1 KΩ. When the load changed to 100 Ω, the load current will be

 30 mA.
 300 mA.
 3 A.
 100 mA.

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