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 we select the mva rating of the circuit breakers?

1 3991

The MCB circuit breaker have a voltage rating of 440VAC it's possible to supply a voltage of 480Vac

1 3677

A circuit breaker is a

9 9249

in indoor type circuit breakers why only the corner breaker trips specially during cold season. What is the reason.

1930

what is difference between vaccum circuit breaker and air circuit breaker?

2 6056

what is the safety points of vaccum circuit breaker.

2134

Advantages of using generator circuit breaker (GCB) scheme in a power station ?

Gridco,

5331

How Many safety of Air circuit breaker

2 5346

How will A Medium voltage circuit breaker(11 kV voltage level) operate under short circuit fault condition whether It is having short circuit release like Low voltage circuit breaker or relay should be given?

2001

What is the function of the circuit breaker failure relay?

2433

What is the criteria in selecting Air circuit breaker(ACB) & Moulded case circuit breaker(MCCB) for a particular range?

DLF,

3 8515

What is SF6 Circuit Breaker?

Amdocs,

2 5338

why we use circuit breakers for switching instead of normal switching device?

1932

What are the tests to be done on circuit breaker?

1 4053

what are the stresses in circuit breakers ?

2075

Related Topics

Un-Answered Questions { Circuit Breaker }

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

2199

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?

1991

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

2127

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

1943

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

1842

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.

1776

Merits & Demarits of Oil circuit & Air circuit breakers ?

2130

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

5193

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

3191

how braking & making capacity of circuit breaker is calculated?

2053

how braking & making capacity of circuit breaker are calculated?

2360

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<

2215

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

2939

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

2210

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

2411