Arc Phenomena and Quenching Methods — MCQs – EE

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1. An electric arc is produced when:



2. The arc in a circuit breaker is caused mainly due to:



3. The medium between the circuit breaker contacts becomes conducting due to:



4. Arc voltage is the voltage:



5. The main aim of arc extinction is to:



6. The process of de-ionization of the medium between contacts helps in:



7. The ionized particles in the arc path are responsible for:



8. The two main methods of arc extinction are:



9. In the high resistance method, the arc resistance is:



10. The low resistance or current zero method is used in:



11. In AC circuit breakers, the arc is extinguished at:



12. Cooling of the arc helps in:



13. Lengthening the arc results in:



14. Splitting the arc into a number of smaller arcs is done to:



15. Blowing out the arc with magnetic field helps in:



16. The arc voltage in AC circuit breakers is usually:



17. The dielectric strength between breaker contacts after current zero should:



18. The re-striking voltage appears:



19. The recovery voltage is the voltage:



20. The medium used for arc quenching in air circuit breakers is:



21. Oil circuit breakers use:



22. SF₆ circuit breakers use:



23. The main advantage of SF₆ gas is:



24. In vacuum circuit breakers, arc extinction occurs due to:



25. The medium in a vacuum circuit breaker is:



26. The arc in a vacuum circuit breaker is maintained by:



27. Arc quenching in oil circuit breakers takes place due to:



28. The arc chute in an air circuit breaker is used to:



29. The dielectric strength of SF₆ gas compared to air is about:



30. The key objective of arc quenching methods in circuit breakers is to:



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