LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
22 views
in General by (24.2k points)
closed by
As the cable length increases, there is
1. less insulation resistance and more leakage current
2. more insulation resistance and less leakage current
3. less insulation resistance and less leakage current
4. more insulation resistance and more leakage current

1 Answer

0 votes
by (24.2k points)
selected by
 
Best answer
Correct Answer - Option 1 : less insulation resistance and more leakage current

Concept:

Insulation resistance:

  • Insulation resistance is defined as the ratio of applied direct voltage across insulation to the corresponding current flowing through it
  • The current flow through insulation is called leakage current
  • Leakage resistance or insulation is the opposition that a substance offers to the flow of leakage current

 

Insulation resistance of the cable is given by

\(R = \frac{\rho }{{2\pi l}}\ln \left( {\frac{{{r_2}}}{{{r_1}}}} \right)\)

Where ρ = resistivity of the material

l = length of cable

r2 = radius of the outer layer of cable

r1 = radius of conductor

The resistance of insulation is inversely proportional to its length.

Application:

As the insulation resistance is inversely proportional to the cable length, with the increase in cable length, the insulation resistance decreases.

As the insulation resistance decreases, leakage current will increase.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...