Objective type Questions in Circuit ( Network ) Theory.pdf - ISBN:0000000000

Objective type Questions in Circuit ( Network ) Theory.pdf

Date: 12 April 2011, 08:49

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FREQUENTLY USED STATEMENTS IN NETWORKS
? To find voltage at any node, start at same node and go towards ground in a shortest path preferably following KVL sign conventions
? If the branch is containing current source the value of branch current is always source value itself and it is independent of branch resistance and potential difference across it.
? When there is only voltage source between two principal nodes, then go for the principal node
? When there is current source in the branch, don’t consider that branch while forming closed loop and write the mesh equations after skipping branch, which contain current source.
? Use nodal analysis to find voltages and mesh analysis to find currents when number of nodal equations needed are equal to mesh equations needed
? When there are super nodes in the network, number of nodal equations will be less than mesh equations. In that case use nodal analysis to find branch currents also
? When there are super meshes in the network, number of mesh equations will be less than nodal equations. In that case use mesh analysis to find voltages also
? To find VAB, start at A and go towards B following KVL sign conventions.
? VAB : Voltage at A with respect to B = VA- VB
? VA : Voltage at A with respect ground by default.
? Two ideal voltage sources with different values can’t be connected in parallel.
? Two ideal current sources with different values can’t be connected in series.
? Two practical current sources in series cannot be combined
? Two practical voltage sources in parallel cannot be combined
? Ideal voltage source internal resistance is zero
? Ideal current source internal resistance is infinite
? Voltage across current meter is zero but voltage across current source cannot be determined directly
? Current through voltmeter is zero but current through voltage source cannot be determined directly

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