Electrical Engineering Interview Questions
Questions Answers Views Company eMail

In power plants the reading changes abruptly to give value (MW -25) (MVAR -15) What are the reasons for this? What is the solution?

GE,

2 4052

what is the difference between AHU and FCU .

JLL,

1 6387

What is the maximum allowed kwa through 2.5mm cable. Electric company installed 2 electric meter at my premises . Two jumper wires of 2.5 mm are used to connect . 2 single phase meters with allowable load 6 and 3 kwa. These jumper wires are taken from a 3 phase electric meter. Meters are in open Sun. What max load these wires can take.

KESC,

1823

I am new guy as an electrical engr. in a 100MW HFO based power project. I am in operations division. I have noticed from last few days, my supervisor sends the last 24 hours energy generation calculation to my plant manager. I have noticed, he calculated last 24 hour's generated energy differences in KWH then he multiplied it with a multiplying factor 960. for example: total difference =2.685 KWH*960= 2577.6 MWH. but he does not not know what is multiplying factor 960?? can anybody explain it??

Orion,

1 3195

what are the advantage and dis-advantage of 3 phase 4 wire energy meter?

1582

what is the dis-advantage of 3 phase 3 wire energy meter?

Exide, Nelco,

1 4182

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

GK Power, NEA, Petrotech,

3748

what is power load and lighiting load?

2 4156

what will happen if secondary of potential transformer (220kv/110volt) of any metering core or protection core (cables) of any phase got earthed??

1 4057

what is the pulse and audio frequency transformer? what is different between induction regulators and tap changing transformer?

1768

A 3-PHASE TRANSFORMER IS USED TO STEP-DOWN THE VOLTAGE OF A 3-PHASE, 11KV FEEDER LINE. PER-PHASE TURNS RATIO IS 12.FOR A PRIMARY LINE CURRENT OF 20A, CALCULATE THE SECOUNDRY LINE VOLTAGE, LINE CURRENT AND OUTPUT KVA FOR FOLLOWING.A)STAR- DELTA.B)DELTA-DELTA.

Ispat, Red Bull,

2617

Dear Friends, Need your help for connecting APFC panel, Quotation : I have 2 No’s 1000 KVA Transformers, both transformers are having separate APFC panels, ( Tr-1,400KVAR, TR-2,450 KVAR) Now I want to stop One transformer, present load is 650Amps, Max, So One transformer is enough, I have switched OFF TR-1, but PF is not maintaining properly, its 0.5, So now I want to connect TR-2 APFC also in TR-1 Loads, Can any one answer for my Quotation with drawing, how to connect TR-2 APFC panel in TR-1 Loads,

L&T,

4 5668

Hi to u all : Friends: Why when operate on 2 phase welding machine the power metr goes reverse ?? the meter is god on other loads. thanks

Gedco,

2 3647

what is motor capacity of 80TR chiller? and also say what is the formula related temperature, motor capacity, TR?

Apotex, Periyar Chemicals,

1946

WHAT IS SPEC OF CLEANROOM MOTOR AND LIGHT FITTINGS?

Apotex, JLL,

1905


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Un-Answered Questions { Electrical Engineering }

How to work definite,over pluxing,revers power,OSR relay

1378


if grounding is notdone at regular intervals for long distance transmission, will the load connected at distribution end receive voltage during negativehalf cycle of the sine wave?

1674


What is Traction? 1KVA Alternator, How much urrent taken?

1701


Is it possible to connect a safety device in to parallel?

1671


why magnetising curve not start with zero voltage?

1958






How to select the earthing transformer,for DELTA TO DELTA TRANSFORMER OR ALTERNATOR SIDE.Pls post your answers and calculation.

1993


1.What is the range of stator resistance of 3-phase induction motor? 2.Two electrically operated vibro motors are foxed in parallel direction in vibrating feeders. what is the direction of both vibro motors?

1577


What do you mean by passive circuit elements and why these are called passive?

776


physical identification of HT & LT panel

1323


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

1544


How to arrange a hous hold earthing system to keep minimum earth resistance( below 7ohms).

1619


2. A current i=(10+10 sin t)amperes is passed through MI type ammeter. its reading will be.........

2038


how to size H.T & L.T Panel ?

1764


The gauge indicates the number of amps, but what about voltage? How voltage rating (for wire or fuse) determined?

1661


why we get 2 differnet values for power factor in 2 watt meter method in 3 phase

1517