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Siemens Electrical Engineering Interview Questions
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at meter room 50 hrc switch installed,but there are not get earthing proper,so what happen?and 11kv transformer out put going in to hrc main 400a three nog each? so earthing is require for all switch? (some customer made earthing at there home.)

 1466

Hello Friends, How can we recognize the CT Star Point is S1 or S2 in case of Electro Mechanical Relays and what is meant by Restraining coil in relays and what is the purpose of that.. thank you in advance..

 1675

how to select the isolation tranformer for siemens 802dsl cnotroller

 1596

What is CRT (Contact Resistance Test) for Isolators or Dis- connector Switches? Why we performed it & whats the Testing procedure.

 1 10345

What is Hi-Pot Test for Grid Station HV Equipments?

 2 6970

is earthing is necessary if we use armoured cable

 1 4902

How we can make sure cable size of LT cable without any parameter.

 2 6026

Whether IP65 enclosure box blocks ventilation if driver for LED have to enclosed inside IP65 box

 1588

If we increases the %impedance of Transformer then price of Transformer will increases or decreases.

 1 3021

How to work star delts method in the case of single phase motor?

 4 7172

How to do the REF Stability test for power transformers in Site?

 1 7965

In synchronous motor, how the field current is related to armature current..i know its inversely proportional..but concept wise...i was nt clear....pls help me...

 1572

what is mean by dry frequency

1936

how is the testing of an REF relay? what are the test REF circuit having?

 1450

We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?

1664

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Siemens Electrical Engineering Interview Questions


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