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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is the responsibilities of electrical project engineer?

2 4442

For backup batteries connection,which method is best? series or parallel ?  

ABC,

3 5426

1) What is difference b/w impedence relay and differential relay? 2) what are substations equipments? 3) what is difference b/w circuit breaker and isolator? 4)what are the types of circuit breakers? 5) which medium is mostlty used in circuit breakers and why it is used?

NTDC,

1 3643

If cvt is most advance & effective(economically & stability)so why not use instead of VT(11 kv & 33 kv)?

3 4169

what is the difference between grounding and earthing......how can we differentiate each other.....

Wipro,

2 3845

How RTCC panel is working and give single line diagram for RTCC with transformer?

AB Associates,

2265

1 sq mm conductor=? how many amps

3 6511

how to calculate power

3 4735

Why mostly the HV side of transformer has Delta?

2322

how current is reverse from its normal direction during the fault?

HGF,

1596

The sodium vapor lamp is not glows when it is connected a distance of 5 meters above from gearbox, why ?

Ispat,

2810

I have a transformer 3phase 11kv/410v and its name plate missing. now how can I judge its rated kva?

Coca Cola,

2 7749

My load is 15 kw,i want to improve power factor from 0.8 to 0.9,how select capacitor

RIB Software, TATA,

2 6904

how to calculate the cable size depending on the transformer rating

2 3892

what is the meaning of impedance protected in instrument cooling fan

2127


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Un-Answered Questions { Electrical Engineering }

A 50Hz,4-pole,3-phase,star-connected synchronous motor has a synchronous reactance of 12ohmsper phase and negligible armature resistances.the excitation is such as to give an open-circuit voltage of 13.2kilovolt.the motor is connected to 115kilovolt, 50hertz supplying. what maximum load can be the motor torque,line current and power factor?

1327


how to calculate IR value of 33KV cable ??

895


what is the minimum voltage require to injure our body?

4463


how to select automotive wire by mathematical equation with given current, vlotage and resistance

1527


List examples of voltage source?

242






Define corner frequency?

247


Which standard we are following earthing resistance test

567


what should be the ideal gauge of wire (In sq mm) for different loads in Ampere?

534


2- What are the percentages between excitation currents in phase (R, S and T) in ∆ and Ỵ connections in excitation Current test in transformers?

1171


advantage of motor design on higher power factor . normally motors are designed for .8 power factor. what is advantage of designing at .88 power factor

1009


why we use sinosidal voltage / current instead of others in system?

1140


what is the difference between skin effect

1327


How to calculate ht side cable of 630 kva oil cooled outdoor transformer?

631


explain the types of drives

1153


What is relation between mu(nought) and epsilon(nought)?

277