Electrical Engineering Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

do we need NGR panel when the output of the genset is LV but after that it is step up to 22 kv. condition is 12 genset 400v are operating in parallel.

1 5504

132 KV TRFO BUSHING BURNT WHEN A 6.6KV HAS BEEN APPLIED TO IT .WHY .ANY REASON ?

MRF,

2 8992

Why is it that North America uses 60 hz frequency while Europe uses 50 hz?

4 9150

Why ACB is used in LT why not in HT and why VCB is used in HT why not in LT

GE,

1 24382

Name of the relay of low lub oil presuure in DG sets

Lineage, Sterling,

2014

why most of the induction are delta connected?

6 9567

sometimes, eventhough the HV side of the transformer is opened there is a voltage in LV side .How is it possible?

4 7270

how can we calculate that how much capacitor is needed for a system to increase the pf?

5 9047

how will calculate the winding ohmic value in 3phase motors in h.p wise? ex.10 h.p motor winding value ph to ph ? 5 h.p motor any calculation please send me.

Hyundai,

1 6399

what different in delta & star connection in motor?explain

Bhushan Power Steel, Hyundai, KPCL, L&T,

5 13842

why the CT ratio secondary is always divided by 5 for eg( 75/5,80/5,50/5)

6 16395

what is the voltage present in the telephone?

Infosys,

10 13620

why do we connect droop ct{in gensets}in y_phase only

2 8210

HOW DG WORKS ?

3 16906

Does the dg syncronization sucessful in practical.

2 4531

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Un-Answered Questions { Electrical Engineering }

we have provided 30 nos. relay contacts in panel.I want to know how do we do the numbering for the relay contacts as per any applicable standards

1976

how many joint can done in HT line and what is life of the joint

2185

slipring induction motor starting time Lrs operating why lrs starting time lrs outer body didn't get shock

1901

main difference between ac and dc?

1667

Is it possible to use a S1 duty class motor for crane application (S4)? If not, why?

2409

on a three-winding transformer relationship delta-delta-star, on third winding why the relationship is a star? what are the advantages and disadvantages? Thank you and please help

1704

What are the section criteria for cables. Now everywhere XLPE power cable is used or PVC is also used?.

1638

Whats the minimum value for I.R. that can be allowed for HT & LT alternators for operation?

4016

I want to ask that is there any relation between current denesity of copper and material purity. also is ther any standard which defines the standard current denesity of material.

1919

-What should be minimum value of insulation resistance and maximum value of earth resistance at any electrical instillation and what is method of testing the same.

2050

What is the resonant peak?

1139

What we mean by vintage of an engine+Generator?

2090

what is load despatching

2172

why industry prefer ht motor instead of lt motor.

2074

WHAT SHOULD BE THE BEST CURRENT RATINGS (PRIMARY / SECONDARY)FOR A CT INSTALLED AT THE INCOMING 11KV PANE? WILL IT BE CALCULATED ON THE BASES OF MAXIMUM DEMANT VALUE OR ON SUM OF ALL TRANSFORMER'S KVA? NOMALLY MAX DEMAND REPRESENT THE MAXIMUM OPERATING LOAD OF THE PLANT AND TOTAL KVA OF (SAY 5 NUMBERS TRANSFORMERS) REPRESENT THE CONNECTED LOAD. WHICH i.e. MAX DEMAND KVA OR CONNECTED KVA ARE BETTER TO USE FOR CT CURRENT CALCULATION? PLEASE ANSWER.

1876

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