Circuit Breaker Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Topic :: Circuit Breaker

Circuit Breaker Interview Questions

Questions Answers Views Company eMail

How do you reset the circuit breaker?

RRB,

1901

what is meant by moulded case circuit breaker ?

ABB,

2131

whycircuit breaker is not connected at the generator end where the capacity of the generator is more say 60MW, 100MW etc.

Adani, Adani Power,

2 6477

What is the basic principle of circuit breaker?.. I read that it works on electro-mechanical principle... Does it require both electric n magnetic conversion to act?

3 6265

what is the pressure of vacuum circuit breaker

2 4866

role of shunt coil in circuit breakers

2 5417

why vacuume circuit breaker is not used for EHV

College School Exams Tests, Crompton Greaves,

3 8062

What is C2-M2-E2 class in circuit breaker. why and where it is to be used in circuit breaker

1 26689

What is auto reclose system in Circuit breakers

1 3875

why r we using vaccuum circuit breakers in the place of m.o.c.b.

1 3535

why vaccum circuit breakers are preferred over m.o.c.b

2 4574

What are the different types of circuit breakers?

IOCL,

3 5840

What is the difference between air & vaccum circuit breakers?

IOCL,

2 6705

difference between isolator and circuit breaker?????

Enercon,

7 13286

acb(AIR CIRCUIT BREAKER)NOT CHARGING AUTO

2310

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Un-Answered Questions { Circuit Breaker }

Can anyone please give me the parameters , formula needed to calculate the circuit breakers for building services.Thanks

2083

what is the effect of connecting three phase supply lines to three phase auto transformer output terminals through a fuse of 10Amp and a circuit breaker (MCB). Is this connection permanently destroy the transformer?

1881

how circuit breaker work.. what is the operations taking place inside a circuit breaker when an overcurrent occurs... is it similar to fuse?

2028

what is circuit recombiner and how it is different from circuit breaker

1815

If a surge divertor is required to be protected by 32 amp C Curve Circuit breaker does this limit the amount of protection from surges that you will acheive

1744

How to select circuit breakers rating eg. if i select a circuit breakers of capacity 40 amps DC with operating voltage 28 volts and if i what to use same circuit breakers for 300 Volts DC application what is the current rating of this circuit breakers.

1682

Merits & Demarits of Oil circuit & Air circuit breakers ?

2027

What is Surge Capacitor? Why it is use in Generator Circuit Breaker?

5077

What is Surge Capacitor? Why it is require in Generator Circuit Breaker,inspite of surge arrester?

3067

how braking & making capacity of circuit breaker is calculated?

1961

how braking & making capacity of circuit breaker are calculated?

2254

When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

2094

LET ME NOW MORE ABOUT icu and ics for circuit breaker. how we calculate the rating of circuit breaker and i c u and ics values

2823

What is the formula to calculate the rating of a three phase miniature circuit breaker

2083

What is the formula to calculate the rating of a three phase air circuit breaker

2273