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,

714

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

Power Grid, AMET, JTO,

10 14587

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 6670




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

GE,

1115

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

NHPC,

9 15880

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

NHPC,

2 2951

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

NHPC,

3 2467

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

3 3938




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

HPL, BSL, Afcons,

1178

which type of motor is suitable for water suction pump ?

4 3005

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

Essar,

6 25793

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

776

Define motor & pump?

3 7767

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?

592

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 2280


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Un-Answered Questions { Electrical Engineering }

in science exhibition how lamp can blink when you clap near the lamp ? thank you

631


What is the main cause of magnetism?

703


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

3314


sir i applied for hpcl(electrical).i want to know from which subjects most of the technical que will b asked.and pattern of the written test.pls help me

665


Advantages of using generator circuit breaker (GCB) scheme in a power station ?

3328






AL=0B9H,bl=75H, ADD AL,BL AL=____________? CF________? OF___________?

711


What is the physical significant of power factor?

577


how to produsing geretor power

698


Hi Friend I am used multimeter to measure the voltage between R Phase(SS1) to R Phase(SS2). In SS1 is connected with UPS loads. But I am getting voltage between these 2 R Phases. Please give some idea friend

639


sir, i am 3 years diploma course pass out candidate.what type of certificate can i got in marine service.

652


How to maintain ac plant?

670


What is the RME and explain the full form and what is the RME work?

809


what is the prinsiple of dc motor and construction and working ,application of dc motor.

596


What is the meaning of 40X8X2 busbar dimensions for carring load of 400 Amps

700


How can you calculate the size of the down conductor cable for the lightning protection system. Is 70mm2 cable can replace 95mm 2 bare copper cable when the copper tape size is 25Wx3 thk mm.

3468