Electrical Engineering Interview Questions
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I have 4 DG set with 1500KVA rating. system breakers are 11KV & alternator are 415 Volts. i want to Know what is max. resistance for body earthing & 415 & 11KV V Neuteal earthing. my fault current is 14 times for 2 sec.

2 3967

WHAT IS THE SIGNIFICANCE OF VECTOR GROUPS IN TRANSFORMER? WHAT WILL BE EFFECT WHEN PHASE DISPLACEMENT CHANGES IN TRANSFORMER?

ABB, Nissi Engineering Solution, NSL Sugars,

5 19714

what is the function of CRGO in a Transformer?

6 6605




what happens when a DC supply is given to AC motor?

Areva, ISMT,

9 16150

what is the difference between elcb,rccb,mcb.

HCL, RCCB,

8 33633

I have a shop heater with a 1/3 hp capacitor start, induction motor driving the fan. Intermittently, the fan motor speeds up significantly for several seconds (15-60 sec) then slows to normal operating speed. The manufacturer suggested changing the capacitor which made no sense, but I did it to no avail. Could this possibly be caused by the centrifugal switch intermittently reconnecting the start winding?

1 1647

how we masure a cuurrent?

5 2954

when we increased the current what do ?

793




how we calculate the dick for a pole?

Power Grid,

769

name the types of insulatter?

5 4511

what is the principal of star delta starter?

9 39988

HOW TO BUILD THE SINGLE PHASE TO THREE PHASE CONVERTER? CAN PROVIDE ME CIRCUIT..THANKS

907

I have 4 DG set with 1500KVA rating. system breakers are 11KV & alternator are 415 Volts. Between alternator & breaker one stepup transformer used. i want to Know what is max. resistance for body earthing & 415 & 11KV V Neuteal earthing. my fault current is 14 times for 2 sec.

Jindal,

1061

Power factor =1.000 at factory in supply. However, PF = 0.8 at motor end. Current = 100 Amp, Voltage = 400 V. What is the power distribution loss? Can I reduce it by adding capacitor at the load feeder?

Accenture,

818

How to calculate the current rating of power cables ?

1 4684


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Un-Answered Questions { Electrical Engineering }

how i calculate the syncrones generator NGR resistance .if we have a 6mw generator line voltage of generator 11kv also line current 393.3 ampere.

783


i have total 8 dg sets for synchronizing and 2 buscoupler,1 sectoin dg no 1,2,3,and 2 sectoin dg no 4,5,6,and last section dg no 7,8 ....if buscupler no 1 and 2 is off mode ..than dg no 1,2,3,will synchroniz of another dg sets?

471


How can we connect additional batteries to three phase ups? What are parameters we have to check when connecting?

692


11kV capacitor bank of rating 2.4KVAR, is charged with protective relays of only over current & Earth fault &.......without Over Voltage, Under Voltage & Neutral Displacement Relay. Is it advisable??

465


how many types of motor can be used in washing machine

837






why servomotor motor? where i apply for best output?

738


can i connect REF and Differencial relay in 1 CT core for transformer protection?

664


bsnl tta exam question

680


I have a relay contact rated at 220v dc which is supplied with a 24vdc from the panel,for it to trip the dampers(24vdc).What if the application of the relay changes so that it should work at its rated 220vdc then will it work at 24vdc supply given or any other consideration needs to be taken .....

762


can you plz send l&t aptitude questions if available its urgent plz plz plz

827


distribution is maximum done by a)radial b)network c) parallel d)b & c

632


Why transformer used in UPS??

167


Write down the name of 2 lady Bir Pratin of Bangladesh

737


Why efficiency of generator is higher than motor at a particular load?

863


How to do cable sizing calculation for 750 A Neutral Earthing resistor for 33kv. the 33kv cable going to swbd. is 630mm2 3 runs.

3437