Electrical Engineering Interview Questions

how to calculate the knee point voltage of current transformer?

4381

3439

EXPLAIN WHY THE SURGE CURRENT RATING OF AN MCCB OR CIRCUIT BREAKER DECREASES WITH INCREASE IN THE RATING OF MCCB OR CIRCUIT BREAKER.

1537

how much amps can i connect for 4core 120mm armade cable

8034

What are the Application of CT & PT ?

4654

What safety precaution are to be taken for avoiding electric hazards ?

1441

what is meant by dedicated earthing?

3229

if 12v battery get discharged for 2 months after if we put charge it will charge again?how much time it will take to charge?

1531

what happens to a turbo alternator if it get trip and 1 out of 3 poles of circuit breaker in close condition

3864

What is the technical formula to calculate the load taken by a motor in Amperes ?

3647

Hello friends., my question is related to testing of current transformer... A Ct having knee point voltage of 750 volts., and I have two step up transformer's of rating 230 v to 440 volts., can I obtain the value of 750 volts by using the two transformer's.... If yes then how could I connect the transformer's to obtain knee point voltage?? thank you in advance

ABB,

4033

trasformer ratting

Bhel,

4040

why are the likely reasons for bochholz & pressure relays oprate due to a internal fault but not differential relay ?

3624

How to select transmission line type (i.e. 11kv or 33kv) for new established industries

1609

how many types of motor can be used in washing machine

1687

Un-Answered Questions { Electrical Engineering }

hi , i have 150 kw loud and we need 50 m cabil,i want to know wich size cabil we use. thanks

1669

What are factors to be considered while we selecting the Core Balance Current Transformer for Earth fault protection

1437

what is negative d.c. voltage, why this voltage is used in base transciever station.

1747

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

Why in metering Ct for ammeters ct secondary side is grounded for each Ct but not in case of CBCT (Core balance current transformer)..kindly some1 highlights the reason..is it because net flux is zero?

970

i have interview in Pepsi company what type of question will ask please send the question and answeer

3001

What is the formula for selecting the cabels according to load? How to calculate what sq.mm cabel to be used?

995

What current flows in the transformer primary when its secondary is open?

652

how many joint can done in HT line and what is life of the joint

1753

Why efficiency in thermal power plant is low?

655

how we can calculate the efficiency of a diesel generator ?

1170

What are the conditions for sustained oscillator or what is backhouse criterion?

653

how is the testing of an REF relay? what are the test REF circuit having?

1468

How to decide DO set rating of Transformer?

1165

we have two generators different capacity on 15 MW and other 6MW at 11 KV , 15 MW gen. bus short level current 40KA,and 6MW short level current 25KA,, length of cable 100MTR between 6 MW from 15MW gen. for bus coupling . kindly tell any one can we use both NGR OR one NGR from any GEN. BOTH NGR has diff. rating. Tariq pakistan

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