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Siemens Electrical Engineering Interview Questions

what is the difference between Ith & Iu rating in MCCB. Particularly on SACE ABB Circuit Breaker?

14628

I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?

1428

what would happen if reactive power (kvar)is increased (more)or decreased (less)? how much exact reactive power should be maintained? and what should be done for that

1511

A car's starter motor draws a current of 100 A at 12,0 V when starting the engine. The mechanical power required to turn the engine is 960 W. At what rate is energy from the battery converted to non-mechanical forms of energy?

1346

What is distance protection relay? where & why we use this relay?

10919

what are the installation procedure of high voltage power transformer,CT,CB&PT?

1363

what are the precuation should be taken ahen installing power transformer,circuit breaker,current & potential transformer

1241

Where is the center of magnetic field in alternator

4824

what is the diffrence between preventive maintinance corrective maintinance?

17651

in a dc motor we supply current only to the armature conductors,from where is the field winding gets excited then??

4262

what are corona losses

4855

How to know Resistance and Reactance value of main and aux winding of single phase capacitor start capacitor run induction motor to find capacitor value?

1255

what is the use of surge suppresser in 33 KV incoming panel. where it must be installed,inseries with incoming cable surge suppresser must be at incoming of the breaker are outgoing of the breaker

4090

What is Harmonics how it is produced and what is the method to control the same

1534

What is the problem, if a circuit breaker is not closing.

17278

How npn and pnp transistor works

387

while working as a Junior consultant(working under a senior consultant)Tell me a difficult situation you have faced and how you solved it? What documents you have referred and documents you have Updated?What was team member's and team leader's reactions to the situation and the way you solved it?

1994

What is the use of value field in the co-pa module? : cost center accounting

335

300

Is sqlite free?

311

how much of quantity of material required for execution of one cubic meter of random rubble masonry in 1:3 cement mortar

1657

What are the advantages of the event-delegation model over the event-inheritance model?

327

How are NumPy and SciPy related?

41

What is a .ocx file?

227

What are the top 10 devops tools that are used in the industry today?

1

How to know Resistance and Reactance value of main and aux winding of single phase capacitor start capacitor run induction motor to find capacitor value?

1255

what do you understand by flashback feature of oracle?

333

i want my company code and controlling area defaut as 'ABC" through out SAP what to do ? and my plantcode also default to some value

1391

Define page output caching?

333

What is mapplet in informatica?

362