Electronics and Communication Engineering - Exam Questions Papers - Discussion


In the following non planar graph number of independent loop equations are

[A]. 8
[B]. 12
[C]. 7
[D]. 5

Answer: Option D


Number of independent loop equations are given by,

L = B - N + 1

where L : No. of loop equations

B : No. of branches = 12

N : No. of nodes = 8

L = 12 - 8 + 1 = 5.

Sesanathan S said: (Nov 23, 2014)  
Need to theoretical explain.

Jadhav Sachin Ramchandra said: (Jan 11, 2015)  
Explain all the terms why the answer is five?

Jiten said: (Mar 22, 2015)  
Explain please.

Saravana said: (Jul 23, 2015)  
I don't know which is node and branches so explain thus concept.

Amarjeet said: (Aug 24, 2015)  

A point or junction where two or more circuit's elements (resistor, capacitor, inductor etc) meet is called Node.


That part or section of circuit which locate between two junctions is called branch. In branch, one or more elements can be connected and they have two terminals.


A closed path in circuit where more than two meshes can be occurred is called loop i.e. there may be many meshes in a loop, but a mesh does not contain on one loop.


A closed loop which contains no other loop within it or a path which does not contain on other paths is called Mesh.

Jayasudha said: (Feb 8, 2016)  
This answer explanation is good and also say some different concept.

Achu said: (Sep 9, 2017)  
Can anyone explain what is meant by planar and non planar graph?

Lakshmi Durga said: (Sep 16, 2017)  
Planar graph that can be drawn without edges that intersects within a plane.

Non planar graph that cannot be drawn without edges that intersects within a plane.

Nikhil Kumar said: (May 3, 2018)  
How the number of branches is 12, can anybody explain?

Mohan said: (May 10, 2018)  
No of lines connected between 2 points or nodes having minimum of one element (r, l, c).

Sandy said: (Feb 18, 2019)  
Can someone please explain it in detail?

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