Electric Circuits
Total instantaneous power supplied by a 3 - φ AC supply to a balanced RL load is

 zero.
 pulsating with non zero average.
 constant.
 pulsating with zero average.

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Electric Circuits
When we use super node technique

 current source branch is common for two meshes.
All of these
 ideal voltage source is connected between two non reference nodes.
 ideal voltage source is connected between non reference node and reference.

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Electric Circuits
A battery of E Volts is supplying a steady current to a series circuit of total resistance RΩ and inductance L Henry. A part R1 of the total resistance is suddenly short circuited. Find the expression for current flowing through the battery subsequent to the operation.

 i = {E / R}[1-(R1 / R) *e - {(R - R1 )*t/L}
 i = {E / (R - R1)}[1-(R1 / R) *e- {(R - R1 )t/L}
None of these
 i = {E / R1 - R)}(1- e - (R1 - R) t / L)

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