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Siemens Electrical Engineering Interview Questions
Questions Answers Views Company eMail

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

 2 16326

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?

 1786

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

 1781

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?

 1628

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

 2 11754

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

 1617

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

 1593

Where is the center of magnetic field in alternator

 1 5242

what is the diffrence between preventive maintinance corrective maintinance?

 7 19189

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

 3 4817

what are corona losses

 3 5554

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?

 1507

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

 1 4555

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

 1776

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

 4 18229

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Siemens Electrical Engineering Interview Questions


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