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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

 N.
 b - N + 1.
 b - N - 1.
 N - 1.

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Electric Circuits
Internal heating of a capacitor is usually attributed to

 leakage resistance.
 dielectric charge.
 plate vibration.
 electron movement.

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Electric Circuits
Which of following capacitors has relatively shorter shelf life?

 Electrolytic.
 Paper.
 Glass.
 both (B) and (C) above.

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Electric Circuits
In a capacitive circuit, the capacitive reactance is

 indirectly proportional to frequency
 indirectly proportional to the square of frequency
 directly proportional to frequency
 directly proportional to the square of frequency

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Electric Circuits
A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is

 5000 ohms.
 1000 ohms.
 500 ohms.
 50 ohms.

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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?

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

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