Electrical Engineering Interview Questions

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,

3771

what is the difference between AHU and FCU .

JLL,

6167

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,

1691

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??

2986

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

1466

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

3971

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

3596

3924

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

3884

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

1649

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.

2457

Dear Friends, Need your help for connecting APFC panel, Quotation : I have 2 Noâ€™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,

5299

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

3299

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

1847

WHAT IS SPEC OF CLEANROOM MOTOR AND LIGHT FITTINGS?

1817

Un-Answered Questions { Electrical Engineering }

what is the interrelation between voltage current torgue speed and magnetic flux in case of different types of electric motors

1540

what is the purpose of high speed earth switch in gas insulated substat

2544

tan delta equation test on alternators

1775

explanation of mesh bus bars

1691

what are the reasons of CT circuit faulty in busbar protection scheme?

965

TRANSFORMERS WITH DC SUPPLY

1533

Why PT voltages are measured with respect to ground? What do u mean by voltage or current polarized.

1930

what is different between relay and plc?

4124

What is cross over distortion? How it can be eliminated?

786

how can i improve the power factor in domestic (230v)

1565

how to select overload-relay for perticular motor 1.for D.O.L. starter 2. for Star-delta starter ????

2392

The 3 phase Delta connection RB=440V, BY=350V,.......* is Line to Line voltage RY= ? And Formula....?

1175

HOW THE OLTC TRANSFORMER SAVE ENERGY IN COMPARISON TO OFF LINE TRANSFORMER AND IS IT ECONOMICAL TO REPLACE THE OFF LINE TRANSFORMER TO OLTC TRANSFORMER

1721

1 “earthing” for bonding of equipment and circuits to common plant earth electrode potential, 2 “protective earthing (PE)” when this bonding is required for personal safety provisions 3 “grounding” for interference suppressing bonding of screens, sys-tems with ground level 4. low-impedance earthing ? 5.primary earthing system and secondary earthing system what is that? 6.earthing electrode or mesh net earthing electrode ? very confusing , simple but very informative help required ? i will be very very thankful to you guys.

1613

In parallel operation time both NGR’s close or not close if both close what will happen

3284