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Electrical Engineering Interview Questions
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Why neutral cable carry current.

Tech Mahindra,

1557

please let me know , we have installed two separate motor for fire fighting system 1) 60 hp and 2) 15 hp the load is 74 AMPS and 20 AMPS then tell me the main power cable in Aluminum will be what thickness , the length is 225 mt from the main utility to fire pump house

 1 1970

area control error

 1325

why reactor is connected before capacitor in APFC panel

 2 2889

How power is transferred from one winding to another in an auto-transformer? A) electrically B) magnetically C( both a & b D) neither of above

ISRO,

3 3213

why is the size of earth conductor is half of phase conductor.

Century Pulp and Paper, L&T,

1 3240

At what speed 1 HP motor can run an electric car of weighing 400 kg?

 1173

At what speed an electric car can run with 2 HP motor of weighing 400 kg?

 1374

I am doing apprenticeship training at HT switch yard in NLC. How can i get electrical c license. ??? What r the rules for getting it as an apprentice? ??

 1413

Difference between RCCB, RCBO and ELMCB.

Megatron Solutions,

3626

we have 2.2kw,Y,3000rpm motor but 6leads found in TB what happen if we connect in delta?

 1289

What the reson for frequant instantaneous ground over current fault in our sync. Generator... 15 triping in 24 hr...

HCPL, Jhunjhunwala Vanaspati Jhoola, Regen Powertech,

1 2374

Leading power factor means what? what is the power factor value while in power factor is leading? is power factor greater than one? In some cases i heard pf 0.8 leading then what about 0.8 lagging?

Rockfort Engineering,

1 1864

Can anyone explain, How will get positive to ground and negative to ground reference voltage in dc system

NCC,

1 1649

What is the minimum distance between MV busbare (P to P & P to E) as per some standards

ABB, Sejong,

1 2885

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Un-Answered Questions { Electrical Engineering }

why star point of HT motor not earthed?

1781

physical identification of HT & LT panel

1247

can any one provide me a connection wiring diagram for a DG set control panel along with BOM?

1784

what happens if dc supply is given and the remedies for it.

1315

what is integrated ac contact circuit

1688




what is the k var ratting of 1250kva

1549

how to enter inverter parameter? without manaual?

1586

what is the difference between elcb and rccb ?

1820

where can the transformer having vector group Yny0 be used??

3633

How does a tertiary winding filter harmonic(espcially 3rd one) from entering into load system?

1408

Which is the largest hydropower station in the world?

662

operation of diesel generator

1578

The metal-enclosed switchgear and controlgear is subdivided into three types: 1. metal-clad switchgear and controlgear; 2. compartmented switchgear and controlgear 3. cubicle switchgear and controlgear. What is the main differnence between them. State some example.

1539

What is the accepted limit to increase the choosen transformer capacity over the load and why ?

2760

hi , i have 150 kw loud and we need 50 m cabil,i want to know wich size cabil we use. thanks

1705

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