• 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

How does sudden changes in load in a DC machine cause “flash over”?

March 18, 2018 by

DWQA Questions › Category: DC Motor & Generator › How does sudden changes in load in a DC machine cause “flash over”?
0 Vote Up Vote Down
How Engineering Works Staff asked 6 years ago
1 Answers
0 Vote Up Vote Down
How Engineering Works Staff answered 6 years ago

Answer: As the load on a generator changes suddenly, the armature reaction causes severe distortions of flux in the air gap. This causes irregular voltage distribution around the commutator. The high value of voltage between segments over a portions of commutator may cause flashover particularly in high voltage machine where the average voltage per segment is necessary high.

Primary Sidebar

Related Questions

  • Which motor has high starting torque AC or DC? asked by
  • How many types of DC motors are there? asked by How Engineering Works
  • Why do we need a starter to start a DC motor? asked by
  • Why are “equalisers” not used in wave winding? asked by How Engineering Works

INTERVIEW QUESTIONS

MCQ or Objective


Recommended Post

MCQs on Power Generation

Electrical Engineering Interview Questions

MCQs on Transformer

MCQs on Engineering Materials

MCQ on Basic Electrical

Categories



Join Our Whatsapp Group


About Us | Privacy Policy | Disclaimer


Copyright@ Since-2017