Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is lowest system voltage?

Apex Holdings,

7 3663

only three phases are coming in step down tranformers.how to get neutral?

5 4662

New istallation how many eathing have one transformer? Names of earthing connect places?

10 20904




a bulb of 100W and anather bulb of 200W , rated supply voltage 230v.when supply voltage is reduced to 100v,which bulb will give more light? and why with calculation?

12 26959

if the diameter of a conductor is 'R' then what is the distance between two bundle conductor in a phase?

NTPC,

1 1766


in single phase we get 220 volt and in three phase 4420 v why this second Ques= in case three phase star conection our neutrul becom disconect what happan 3 Q=== a three phase house load and have unbalce load on different pahse diffrent current eg phase a 7A b 8A c 5A and voltage is 440 than how calculate it total load in kw pl give formula thanks

8 6873

WHAT IS SEMICONDUCTOR? EXPLAIN DETAIL. FOR EXAMPLE TAKE A PENCIL.THE LEAD IS MADE UP OF GRAPHITE IT IS A CONDUCTOR.THE OUTER COVER IS MADE UP OF WOOD IT IS INSULATOR.PENCIL IS A SEMICODUCTOR MATERIAL.

5 10592




what is Aircraft earthing and what does it do?

6 20214

Why is the diffrential protection in DG. What if the CT polarity is reversed while connecting for the same type of protection? How polarity can be made ok?

1 4275

what is corona effect?

Genco, Wipro, ABB,

39 70370

what is CT class? depending upon which it is classified?

Siemens,

3 5344

what is automatic voltage regulator and it is used?

TCS, ACME,

28 40445

what is meant by form factor and hoe related with the HT transmission voltage

2 5480

How to make vector group test of transformer?

2 4917


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Un-Answered Questions { Electrical Engineering }

According to IEC60034-14, When the vibration monitoring system required for motor Bearing. above which KW, it is required? and for what type of bearing the vibration probe is provided.

2687


What is the requirement of grounding the neutral of single phase generators on load? If the neutral is not grounded, what will be the effect?

888


How phase displacement change in the over current relay coils.

1138


Explain the different methods used in the choice of rotor slots for reduction of harmonic torques in an induction motor.

656


How we can determine short circuiting current any plant and for example a plant which power generation is 415 volts and plant load is 500 kw.

816






how to calculate the breaking capacity of different breakers.

956


How to calculate the sag of OPGW during stringing???

1287


how is find out kwh step by step

546


when we have to use UPF wattmeter and LPF wattmeter? what is the difference between UPF and LPF wattmeter in terms of construction?

1096


FEINGING DECREASES THE FLUX DENSITY IN THE AIR GAP. HOW?

793


Sir, My doubt on cable sizing calculation, Load:74 KW calculated cable 1 run 50mm2. Now client asking us to reduce cable size by increasing runs. Sir, My question now when my mind strikes with 2 options 1) Divide load 74/2 = 36 and calculate cable for 36+36 making it 2 runs or 2) Simply i can divide 50mm2 /2 ie. 2 runs of 25mm2 Please suggest me sir

599


why zero sequence impedance measurement is not applicable for single phase GT

857


What we mean by vintage of an engine+Generator?

787


how to determine the cable size...pls explain me with the formula taking particular load....does the factors like impedance & short circuit rating influence the cable size, if so how....

868


what the Microsoft .NET framework is?

691