• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

How Engineering Works

  • Home
  • MCQ
    • Electrical MCQ
    • Civil MCQ
    • Mechanical MCQ
  • Interview Questions
  • About Us
  • Privacy Policy
  • Disclaimer
  • Contact Us

Why does a humming sound occur in high voltage transmission lines?

October 10, 2017 by betuk

DWQA Questions › Category: Transmission and Distribution › Why does a humming sound occur in high voltage transmission lines?
0 Vote Up Vote Down
betuk asked 6 years ago
3 Answers
0 Vote Up Vote Down
gunju answered 6 years ago

This computer humming sound is coming due to ionization (breakdown of air into charged particles) of air around transmission conductor. This effect is called as Corona effect, and it is considered as power loss.

0 Vote Up Vote Down
Geta answered 6 years ago

Whenever the voltage passing through a conductor exceeding a certain value the air molecules around the conductor got ionised. the ions moving in the atmosphere, they take energy from the supply so a hissing noise will occur.. this effct is called corona effect..

0 Vote Up Vote Down
betuji answered 6 years ago

The HT lines causes humming because of corona effect.when the voltage of transmission lines increases too much to produce electric field of magnitude of 10^7 v/m.That is more than the electric field required to break the inter molecular bond of the air molecules.Hence the air particle around the lines get ionized and start moving freely.and during this movement several collisions occur and resulting a humming sound.

Primary Sidebar

Related Questions

  • Why is voltage regulation better in case of DC transmission? asked by How Engineering Works
  • What is the purpose of transposition of conductor in three phase transmission line? asked by How Engineering Works
  • What is the definition of sag in transmission line? asked by How Engineering Works
  • How does power factor affect power transmission line? asked by How Engineering Works

INTERVIEW QUESTIONS

MCQ or Objective


Recommended Post

Resistance

MCQ on DC Generator – 1

Mechanical Engineering MCQ’s

Ohm Law

MCQs on Induction Motor

Categories



Join Our Whatsapp Group


About Us | Privacy Policy | Disclaimer


Copyright@ Since-2017