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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

why current transformer secondary is short circuited an what will happen if connect very high resistance acrossthe secondary side of current transformer?

NPCIL,

1 2672

A ray hit a smooth regular surface at an angle of 20 from the normal. Calculate : 1. The angle btw the incident and reflection ray. 2. The angle of deviation.

1298

Is there any problem about which the drive (inverter) doesn't show/display the alarm and/or fault but instead of this , it doesn't work ? I want to know that could there be any kind of problem in the drive when the drive doesn't display the alarm and/or fault ?

Siemens,

1352

What are the symptoms of a bad PG card of a drive (inverter) esp. of Yaskawa Ac Drives (inverters) G7 ?

1305

How to reverse the direction of a DC motor ? By reversing the Armature wires or by reversing the field wires

KFC,

2 4041

How to distinguish between the armature wires with the field wires of a Dc motor ?

5 6234

What test must you do before powering up a circuit that you have been working on?

1227

What can make the the overloads operate when a star delta three phase motor starts?

1 2735

Can you use a different size cable to complete a circuit if you run out what you are using?

2 3057

i want to trigger ATS (Mains +Generator )from external system could any body help me in this regard ?? is it posible if yes please tell me how?

1 2224

Fot testing new star-delta 132 kw motor in electrical worshop.we should check in star or delta connection as we do not have higher capacity cable in worshop?

Adani,

4 4727

what is the difference b/w pvc cu conductor and cu breaded wire..?

1 2651

What is the starting current of a motor?

3 4438

is it true there's a big difference in using Cummins or Denyo...especially power output or leakage

1220

factor to be considered for bus bar design

1465


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Un-Answered Questions { Electrical Engineering }

What magnetic circuit is formed in berry-type constructions and why?

474


Please brief me about number of pole in alternator.In single phase alternator coils are connected in star or series. How to calculate frequency for the same.

1226


I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?

1147


How to calculate that clean water supply in one Day from 150 KLD STP?

1394


State nyquist stability criterion.

464






What are motor generator sets and explain the different ways the motor generator set can be used ?

502


What is ST and specify its range of voltage.

1312


what is the k var ratting of 1250kva

1357


what is distribution board?

1674


Dear all, I just want to ask an expert on this forum for some insights. For the magnetic balance test, when applied voltage on a Delta-Star transformer e.g. Dyn11, the following relationships apply for HV side: 1.  H1-H2 = H2-H3 H3-H1 2.  H2-H3 = H3-H1 H1-H2 3.  H3-H1 = H1-H2 H2-H3 For the LV side also: 4.  X1-X0 = X2-X0 X3-X0 5.  X2-X0 = X3-X0 X1-X0 6.  X3-X0 = X1-X0 X2-X0 Is there a similar pattern for Y-d, Y-Y, D-d? And how about Y-z, D-z, Z-y transformers? I've tested a YNzn5 transformer and for LV side I don't see the pattern. In this particular case I got for LV side the following (see values below): H1-H0  H2-H0  H3-H0    X0-X1  X0-X2  X0-X3 128.0  119.9  7.2      29.2   13.3   15.8 70.7   128.4  59.2     23.4   22.0   3.6 7.2    120.1  128.1    13.4   29.3   15.8 What is the relationship here for LV? For row 1 I see the relationship, for row 3 I also see but it's shifted, but for row 2 I don't see such relationship. Any suggestions, answers, someone?

1185


why motor range is available 22kv,30kv,37kv,45kv and so on? why motor range is not available 21kv,24,25,26,27kv and so on?

2190


what is the basic construction diffrance between servo motor ans sqiralcage induction motor

1836


what is difference between 9kv 5ka surge arrester and 9kv 10ka surge arrester.

1133


11kv/433v delta/star distribution transformer primary side full load Ht current is 83.33A in , but input side VCB rating 800A.why?

1047


how the characterstics of control valve being done

1309