Electrical Engineering Interview Questions

Uses of induction motor

NTPC,

28792

I want Primary side delta and Sec side Star connection transformer . but i have received Star - Star transformer ,shall i use the same transformer by giving the only 3 ph on Primary side without Neutral connection on the Starpoint.

9235

Why current flows in nutral? As per theory there should be no current in 3 ph explain.

Bhel,

16566

What is the difference between phase current & line current, how both can be measured in star and delta system

80142

Difference between ups

88682

What is the formula for finding fault level of generator?

34432

I am mechanical engineer,I need Training in Electrical & Electronics ( i.e. three days workshop training ) Where will I get the same Please suggest?

3711

can you send me the placement papers of electrical engg. from companis like NTPC,DRDO,IOCL,HPCL,BPCL etc.?If,plz send as soon as possible.Thanks.

NTPC,

1608

What will be the average KVA rating of Auto Transformer for 75kw 415V , 3phase induction motor

5102

If the capacitor bank is installed in switchyard say 132/22kv then on LT side say 22kv/0.433kv is it necessary to install capacitor bank for maintaining power factor. if pf is maintained on HT side then will that be maintained on LT side as well.if not then how&why??????/ please explain...........

10020

what is relation between vector group of transformer and its load hormonics?

3394

What are all present producing cost of Per KWH of various Fuel?

2013

Why the generator rating in kva

97206

Please nybody say, weather the result of Bharat Oman is declared or not? Probable date of declare???????

1454

wat s the difference between diode and capacitor

TCS,

24368

Un-Answered Questions { Electrical Engineering }

How can calculate the rating of a alternator for a given specific load with formula

1775

How many wall/floor flange will i use in bus duct system if we have in our design a 35th floor building.

957

Is it required to lay 2 runs of GI wires along with armoured cables from one power DB to another Power DB?

1413

A 230V dc shunt wound motor has an armature resistance of 0,15Ω.When operating on no load at 650 rev/min the armature current is 6A . The motor takes a full load current of 85A. Calculate the full load speed if the field flux is (i) maintained constant (ii)reduced by 0,03

1510

explain wiring system

1998

why the arc welding machines require parallel earthing systems? ie why each machines are connected to earth pit by separate wires during earthing? wats it adavantages?

1669

why transmission is only 3 phase and not 2 or 4 or poly phases

1637

what is a pulse transformer? how rise time of pulse changes when ever the voltage changes?

1413

IN electrical field, WHAT ALL THINGS THE CUSTOMER WILL ASK WHILE ORDERING FOR LT PANEL (ALL TYPES OF LOW TENSION PANEL)

1555

What is the exact formula for one weber of magnetic flux?

1583

Explain cmrr?

621

What are the two basic types of transformers?

568

What are reasond for high wattage in single phase induction motors

1282

We have 750KVA DG set, we want to introduce REF relay with 1250/1A,CL PS,Current transformers.The lead distance of 2.5mm copper flexible cable from CT to relay is around 5mtrs.We would like to know the knee point votage(VK) & IM calculion for CT's

1359

previous year paper of ntpc bhel for degree in electrical enng

2705