Electrical Engineering Interview Questions
Questions Answers Views Company eMail

Send me Model Question paper for the post Scientific Assistant in NPCIL

6975

dear sir/madam i want to get some knowledge about RRB EXAMINATION(section engineer) 1- what is minimum cut off 2- wht portion is major portion . 3- can any body provide Sample paper. thanks & regards ashish

RRB,

850

how can we know cable size for a given current? if any one have catalogue plz mail to vijay_raju369@yahoo.co.in

5 20082




what is mean by derating factor?

Essar,

4 16859

why in three phase 440 circuit in all phase current is almost equal L1-35 A,L2-34 A ,L3-31 A but in nutral when i check with clamp meter it shows 25 A?

OPS,

4 8391

What is meant by Active and reactive power?

Micron Electricals, SVIT,

8 8766

What is meant by Active and reactive power?

Torrent Power, Schneider, College School Exams Tests,

23 89586

why for transformer protection we protect tranformer from 3rd hormonics and 5th hormonics and what is the reason of generating these horminics in electrical system?

Essar, OPS, LG,

2 6287




what is difference between start imitation and start interlock for 3 phase motor protection ?

OPS,

2 5210

1.Whats the use of GNAC(Generator Neutral Accessory Compartment) 2. why generator or any other system require Neutral Grounding and not Phase grounding 3. what happens if any one of the phase is grounded. 4. if 15kv is grounded directly what will happen, why it should not be grounded like that 5. use of of NGTR(Neutral Grounding Transformer and Resistor) for grounding is helpfull and how

CSS, Powergear, BEMCO,

5 17438

what you mean by frequency of an igbt& how to find it?

1 1680

what is suitable alternative for an igbt?

4 5201

i have interview in Pepsi company what type of question will ask please send the question and answeer

Pepsi,

2115

hi frnds can any one help me ? plz send me placement paper of hpcl of Electrical streem .... plz send ....its urgent . The hpcl test is on 17th feb.

1 1995

Why are you like to join it job as a electrical engineering student?

Bhushan Power Steel,

4 5122


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Un-Answered Questions { Electrical Engineering }

1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

686


How do we calculate the Out put voltage of generator, after the excitation is being given?

800


we have 3 single phase transformers. how will we generate 6 supply from 3 phase supply input

922


how we can explain arc heatng?

741


In a large office how do we calculate required number of light fittings, assuming fittings are 4x18W or 2x36W fluorescent fitting ?

703






what is protection class current transformer.

2378


do we use neutral grounding for resistive balanced load? if we use what happen?

608


we are going to install a solar PV site and how can we calculate PV Solar Panel Efficiency, can anybody tell me complete method for its calculation.

832


A jet of fluid strikes a plate What was the force required to counter it?

697


Give details of your interested designation, the post you are interested to serve the company better and explain why you think you can serve the company better in such position if employed?

1942


design a 3 bit synchronous and asynchronous counter using T- flipflop

723


why voltage form factor of PT are increase , when it is ecpected heigher spikes in system. how it is calculated.

775


How to protect sensitive loads such as Dosing pumps inside a factory from voltage surge/voltage fluctuation.

424


what is the difference between changer, converter and transformer?

191


How to back charge the Gas turbine generator

844