Electrical Engineering Interview Questions
Questions Answers Views Company eMail

I have 480V Single phase and I am trying to figure how big of a transformer (KVA's) and Primary breaker size I need to provide 200 Amps at 240V for a building.

Wipro,

1 862

what will happen when power factor is leading in distribution of power?

Power Grid, AMET, JTO,

10 15041

In CDG type IDMTL realy O/L , E/F, O/C which are used for out going feedrs,on R-phase o/c element, Y-phase , e/f elecment and on b -phase o/c element will be connected . Why the earth fault on center phase only, why not on other two phases?

2 6818




which fault is severe and why?between lll fault and lllg fault which fault is severe and y?

GE,

1202

what happen if we give 220 volts dc supply to d bulb r tube light?

NHPC,

9 16492

suppose generator rating is 50 kw,load is 25 kw,hw much d generator ll generate?what about d remainin power?

NHPC,

2 3044

if d gen is 50kw,load is 60 kw,hw d gen ll supply d remaining power?

NHPC,

3 2602

What is the significance of vector grouping in Power Transformers??

3 4064




how we do Vector group ,magnetic balance and tap changer test in Transformer?

HPL, BSL, Afcons,

1244

which type of motor is suitable for water suction pump ?

4 3146

WHAT IS THE DIFFRENCE BETWEEN EARTHED AND UNEARTHED CABLE (XLPE)?

Essar,

6 26486

for 5KW resistive load can anyone please suggest me whether to go for UPS/Inverter or Generator depending upon cost calulations

837

Define motor & pump?

3 8069

I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?

660

why we not connect the 12 V batteries in parallel to get the more backup supply for an UPS ? wheter off line or on line UPS ?

2 2397


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Un-Answered Questions { Electrical Engineering }

how pt is using

699


Explain with example of functional requirements of protection relay in terms reliability, selectivity, sensitivity

548


Dear all, I'm manikandan I have done by DIPLOMA EEE from 2011 , I have 5 years of experience from Power plant instrumentation field , which one field is give long life & which one field is best ,I confused a lot and also I'm studying AMIE, can I choose which department from Section B examination? pls tell me

363


i applied for c licence with my one year apperents trainee and i have attaced with A grade contractor company experiance that is for 14 monts experiance this document is sufeicant for c licence? pls tell why they rejected

833


Refernce currents are to be generated using refernce cueernts how can this be done

929






what is the role and fuction of automatic transfer switch in rotary ups

757


Ceiling Fan and Storage type water heater. Discuss

826


What are the specifications for conducting earth leakage test as per IEC standard?

631


What is earth system using on the floater TN-S or TT. Iam not sure and what ICCP

274


how much flux density of CRNO core

1318


WHY THE COLOR OF OUTDOOR TRANSFORMER IS BLUE ONLY???

802


Control cables in S's will carry 1000v which is AC R DC? Pls answer me 

825


54 Comments Alok and Bhanu play the following min-max game. Given the expression N = 38 + X*(Y – Z) where X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it. Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z). Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable. Assuming both play to their optimal strategies, the value of N at the end of the game would be?

1003


what is the reactance,capacitance & impedence electrical armoured & unarmored Cables.

787


from generating station If 400v LT line length is 1000m how much voltage is drop and how do i calculate it? which cable will be use for this line?

817