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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

If a line which is drawing approximatly 2100amps what should be earthing streep size(using galwanize streep)?

2 2035

why the field winding of synchronous machine is excited by dc source

2 4397

WHY WE NEED NEUTRAL FOR 3PH 400 OR 415 VOLTS POWER SUPPLY (4 WIRE SOURCE).

5 6230

how make megger test for control cable like 12c x 1.5mm and what it apply voltage and test timing details.

1276

why transformer rating in KVA ?

Bhel, TATA, Voltage,

8 7579

testing ZNYn11(d) vector group transformer

1 6240

1.Why we use choke?If we use for high starting voltage then different type choke gives different voltage. Is it correct?

Dalkia, Luminous,

2 3657

which of the folowing has negative temperature coefficient of resistance? a. mercury b. copper c. lead d. carbon

2 6087

why there is no grow of grass under the high voltage transmission line?

TATA, Tata Power,

3 5885

is it possible to minimize the copper loss?

Coal India, TATA,

2 3986

what do u mean by PS-0.2-5P class of Ct

ABB,

3 6556

If there are two transformer having rating of 2.5mva, 6.6kv/440v(satr-star),and the load is 600kw then what is better to maintain less losses in transformer having both transformer in parellel or only single transformer connected to load? Please give calculated answer

UltraTech,

1688

How we can recongnise the phase displacement of transformer connection between primary & scondary...plzzz explain it with example.........

BOC,

1365

What consists of 2 or more thermocouples to be connented series?

1054

what is the use of commutator in dc motor if we supply ac ? commutator is used to convert ac to dc.and it is used to arrange the flux in unidirectional in case of dc supply. if we give ac as supply to dc motor what is the use of commutator?

1104


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Un-Answered Questions { Electrical Engineering }

What are the internal and external faults?

136


i am going to correct power factor of 1600kw induction motor,when i calculate capacitance of capacitor it is three time more in star connection than delta. if motor is star connected which connection i shall adopt for capacitors and reason for adopt this connection

997


What is the effect of positive feedback on stability of the system?

180


how we decide the require size is this for a known current at fuu load?

982


What is the function of NER and NET?

1531






how the B-H loop obtain under the static condition

1194


234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

1160


i am going to give the JSEB,RANCHI exam for power plant,so i need some samples of papers related to that,so please send me these papers by my mail id.

2548


what are the accessories need to be added while doing estimation for the following: 1.MCCB 2.MCB 3.ACB

1000


draw vector diagram and +ve,zero sequence diagram of symmetrical three phase fault.

1006


What is the exact minimum vale of voltage between an earth and netural which can damage or can do malfunction of the electronic equipments ? If this is mentioned in any book, pl.give reference.

1313


write down the formula of cable size in RM if current is 50Amp.

424


I would like to know that the fault curretn at base load and at 10% generation will be same? Fault level of BUS remain same with different generation?

893


solar energy light efficiency & disadvantages?

1076


we have 15 ampere variyac but we want 30 ampere variyac what we do

850