• Home
  • Courses
  • Machines
    • Transformer
    • AC Motors
      • Induction Motor
      • Synchronous Motor
    • DC Motor
    • DC Generator
  • Power System
    • Circuit Breaker
    • Switchgear
    • Substation
    • Control System
    • Measurement
  • Electronics
  • Blog
  • Contact
    • Contact Us
    • Privacy Policy
Have any question?
[email protected]
RegisterLogin
StudyElectrical.Com
  • Home
  • Courses
  • Machines
    • Transformer
    • AC Motors
      • Induction Motor
      • Synchronous Motor
    • DC Motor
    • DC Generator
  • Power System
    • Circuit Breaker
    • Switchgear
    • Substation
    • Control System
    • Measurement
  • Electronics
  • Blog
  • Contact
    • Contact Us
    • Privacy Policy

Circuit Breaker

Circuit Breakers – Objective Questions – Part 2

  • Categories Circuit Breaker, Objective Questions
electrical-Interview-Questions

 

Part 1Part 2Part 3Part 4Part 5

16. Out of the following circuit breakers, which one has the lowest voltage range ?

(A) Air-break circuit breaker
(B) Tank type oil circuit breaker
(C) Air-blast circuit breaker
(D) SF6 circuit breaker.

A

17. Which of the following circuit breaker can be installed on 400 kV line
circuit%2Bbreaker%2Bobjective%2Bquestions%2Bpart%2B1

(A) Tank type oil circuit breaker
(B) Miniature circuit breaker
(C) Vacuum circuit breaker
(D) Air blast circuit breaker.

D 

18. In a vacuum circuit breaker, the vacuum is of the order of

(A) 10mm Hg
(B)10-2mmHg
(C) l0-6 mmHg
(D)10-9mmHg.

D

19. In modem EHV circuit breakers, the operating time between instant of receiving trip signal and final contact separation is, of the order of

(A) 0.001 sec
(B) 0.015 sec
(C) 0.003 sec
(D) 0.03 sec.

D

20. In a HRC fuse the time between cut-off and final current zero, is known as

(A) total operating time
(B) arcing time
(C) pre-arcing time
(D) any of the above.

B

21. Fusing factor for a HRC fuse is

(A) Minimum fusing current / Current rating
(B) Minimum fusing current / Minimum rupturing time
(C) Maximum fusing current / Minimum fusing current
(D) Minimum fusing current / Prospective current of circuit.

A

22. Which of the following circuit breakers does not use pneumatic operating mechanism

(A) Air blast circuit breaker
(B) SF6 blast circuit breaker
(C) Air break circuit breaker
(D) Bulk-oil circuit breaker.

D


23. The contact resistance of a circuit breaker is. of the order of

(A) 20 micro ohms ± 10
(B) 20milli ohms ± 10
(C) 20 ohms ± 10
(D) 200 ohms ± 10.

A

24. The insulation resistance of high voltage circuit breaker is

(A) 1k Ohm
(B) 10 k Ohm
(C) 20 Mega ohms
(D) 2000 Mega ohm.

D

25. There is definite objection to use of which of the following medium for extinguishing the arc in case of a circuit breaker ?

(A) Air
(B) SF6 gas
(C) Vacuum
(D) Water.

D

26. In a circuit breaker if the insulation resistance between phase terminal and earthed frame is less than the specified limit, the probable cause could be

(A) moisture
(B) dirty insulation surface
(C) carbon or copper particles sticking to the internal surface
(D) any of the above.

D

27. If a circuit breaker does not operate on electrical compound, the probable reason could be

(A) spring defective
(B) trip circuit open
(C) trip latch defective
(D) any of the above.

D

28. The normal frequency rms voltage that appears across the breaker poles after final arc extinction has occurred, is

(A) recovery voltage
(B) re striking voltage
(C) supply voltage
(D) peak voltage.

A

29. The transient voltage that appears across the contacts at the instant of arc extinction is called

(A) recovery voltage
(B) re striking voltage
(C) supply voltage
(D) peak voltage.

B

30. In a circuit breaker the active recovery voltage depends upon

(A) power factor
(B) armature reaction
(C) circuit conditions
(D) all of the above.

 

D

Related Articles

  • electrical-Interview-Questions
    Circuit Breakers - Objective Questions - Part 1

      Part 1Part 2Part 3Part 4Part 5 1. A circuit breaker is (A) power factor…

  • interview question circuit breaker
    Circuit Breakers - Interview Questions with Answers

    1. What is a Circuit Breaker? Circuit Breaker is a mechanical device designed to close…

  • ACB Air Circuit Breaker
    Working of Air Circuit Breakers

    What is an ACB? A circuit breaker in which the contacts open and close in…

  • Square D Circuit Breaker
    Square D QO Circuit Breakers

    QO stands for Qwik-Open. Square D QO Circuit Breakers are fastest tripping circuit breakers at…

  • circuit breaker rating
    Circuit Breaker Ratings

    The rating of circuit breaker is given according to the duties that are performed by…

  • Types of Circuit Breakers
    Different Types of Circuit Breakers

    A circuit breaker is a switching device which can be operated manually as well as…

  • Share:
author avatar
Electrical Engineer

Previous post

Air Blast Circuit Breaker - Construction, Working and Types
June 4, 2014

Next post

Condition Monitoring for Transformers
June 9, 2014

You may also like

Transmission-switching
Why Do We Use Transmission Switching in Electricity Supplies?
8 August, 2022
Principle of core balance protection RCCB working
How RCCB/ELCB Protects You from Death?
10 November, 2021
electrical fuse
What is an Electrical Fuse? Types, Properties, and Application
12 June, 2020

Leave A Reply Cancel reply

Your email address will not be published. Required fields are marked *

Search Here

From Blog

5 Types of DC Motors | Series, Shunt, and Compound
27Dec2014
4 Electrical Safety Tips For Homeowners
4 Electrical Safety Tips For Homeowners
26Apr2022
Substation-components-equipment-layout
Electrical Substation: Equipment, Types, Components & Functions
17Apr2019
MIT 6.003 Signals and Systems Course
What is Signal? | Definition, Types and Examples
30Aug2022

Categories

  • Alternator
  • Arduino
  • Basic Electrical
  • Battery
  • Books
  • Cables
  • Capacitor
  • Career
  • Circuit Breaker
  • Control System
  • DC Generator
  • DC Motor
  • Drives
  • Electric Vehicles
  • Electrical Circuits
  • Electrical Machines
  • Electrical Relays
  • Electrical Safety
  • Electronics
  • Embedded System
  • Exams
  • Generation
  • Guest Post
  • HVDC
  • Instrumentation
  • Interview Questions
  • Locomotives
  • Measurement
  • Microcontroller
  • Objective Questions
  • PCB
  • PLC
  • Power System
  • Problems and Solution
  • Projects
  • Resistor
  • Signals and Systems
  • Single Phase Motors
  • Substation
  • Switchgear
  • Synchronous Motor
  • Three Phase Induction Motor
  • Transformer
  • Transmission Line
  • Uncategorized

Copyright © 2021 Study Electrical, Inc.

© StudyElectrical.Com 2021

Login with your site account

Lost your password?

Not a member yet? Register now

Register a new account

Are you a member? Login now