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Electrical Engineering Interview Questions

What is the need of earthing transformer for delta side of a transformer. (Think of a line section between a star/delta transformer at a grid substation and delta/star transformer at a village. An earthing transformer is there at the delta side of the star/delta transformer at grid substation). As there are no ground reference there will not be fault current if a one phase is grounded. Further L-L phase will be sensed by the primary side of star/delta transformer as a L-G fault. So why an earthing transformer is required at delta side

CEB,

576

Can i replace Earth leakage relay to the faulty Earth Faulty Relay

638

How to Calculate KA Rating of Main LT Panel

671

Control wiring of a dol starter for forward and backward

579

why transformer tank is in rectangular shape what happen when it is in step shape

556

The efficiency of a 100kva transformer is 0.98 at full load as well as half load , for this transformer what is the Copper loss at full load ?

935

How to calculate Temp from Resister from PT100 equation,

743

explain which quantities change in the starting and the and the running condition in induction motor

552

what is a composite error in current transformers, why occurs & in which it will occur i.e, either metering ct/ protection ct

749

Why open circuit test of transformers is conducted at rated voltage??Why not any other voltage??

654

Why the power factor improvement is so important in industrial loads

950

How can we convert 11 kv to 440 volt without using transformer ?

646

can we use engine degreaser for electrical motors?

870

Why auxiliary transformers are not connected in parallel in primary stations?

560

What will happen if i used 11KV earth ht kit to 11 KV / 11 KV cable termination?

588

Un-Answered Questions { Electrical Engineering }

What are IR values and what it should be for coil and for insulator

2081

Please tell me the earthing procedures adopted for the STAR-STAR 3 Phase transformer in india and give a better sugession for earthing

1137

Explain the functioning of diode?

253

Name the test signals used in control system

333

If two Transformers are connected in parallel having impedance of 50KA in both transformers will the impedance increase or decrease after connecting transformers in parallel?

1150

dear sir, i completed diploma in electrical in 2005, how i can get electrical supervisor liance in mumbai

1075

Stator of 3-phase IM has 3 slots per pole per phase. If supply frequency is 50 Hz, calculate the speed of rotating stator flux A 1000 rpm B 500 rpm C 1500 rpm D 1440 rpm

1258

What is the function of under voltage release ?

604

Why have to use copper cable for local isolator to motor ?

1245

What is vaccum currcuit breaker.define with cause and where be use it device?

238

What is mathematical model of a control system?

252

While HT line put on to activate ACB in low tention panel VCB tripping instantly.why it happens

1136

what is the question paper model for section engineer in RRB

1139

How can ou verify the size of conductor 50Sq.mm ACSR

988

i have to install a HT panel, what components, I have to use in this and what will the diagram of that diagram,please tell me each and everything.

870