Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is XLPE type cable

Areva,

8 7619

HOW TO CALCULATE THE HEAT AND LOAD OF LT-SUBSTATION WHICH CONTAINS 2*1MVA TRANSFORMERS,LT SWITCH BOARD,MLDB,ACB,BUSBAR,ETC...?

2589

HOW TO CALCULATE THE HEAT AND LOAD OF LT-SUBSTATION WHICH CONTAINS 2*1MVA TRANSFORMERS,LT-SWITCH BOARD,MLDB,ACB,BUSBAR,ETC,......?

754




What is erection of electrical system?

1 3661

what is rotatng magnetic field in case of three or multiple phase alternating current machines???

NHPC,

1 2040

Brushed alternator is also called dc generator ? its true or false ?explain it ?

5 3253

what is the working principle of Brushed alternator ? without exictation how we can give dc supply to rotor ?

1 2295

Totally how much power will be consumed in 1 hour cotinuous running of electric train engine?

L&T,

1 2395




Name some application zrea where IDMT relay can used?

SKB,

3 11176

i am working in a grid substation,TNEB having 13 yrs experience. Am I eligble to get apply for c licence now?

3 4836

I am a possesor of c licence from 1993. I forgot to renew during the year 1998. During that time I was working at TNEB to till date. Is there any possibility to get renewed? or to apply for a new one?

738

HOW MUCH CURRENT DOES SYNCHRONOUS MOTOR TAKES AT SYNCHRONOUS SPEED IN NO LOAD CONDITION ?

622

why different series of vfds (like allenbradley)are used in industry ?

927

what is difference between c-power & u-power air circuit breaker?

Areva, IIT, Marine Electricals,

2 14760

what is meant by Back emf ?where its occur ?

5 8097


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Un-Answered Questions { Electrical Engineering }

how to remover corona effect and hysteresis losses from contactor

787


in dc suppy frequency is zero why? if dc frequency is zero how to exist dc transients and ac transients

777


The 3 phase Delta connection RB=440V, BY=350V,.......* is Line to Line voltage RY= ? And Formula....?

114


Why 9KV surge arrester having 7.65KV of MCOV?

158


How to decide CT & PT ratings for a given transmission line carrying some rated voltage?

1088






how to calculate the change over time for star delta starter for different KW motor?

2367


What information we need to prepare relay coordination chart

992


How to measure size of cable on a given load

569


How to select, design,size & calculate for 11 KV/33KV/66KV/132KV/220 KV/440 KV circuit breaker for HT side of transformer protection/HT distribution protection?

1299


In our plant we have installed new MCC with ELR and CBCT which is detecting some leakage current in the system but it leading to some confusion when to check that in which feeder which is drawing current we put off the whole panel itself but still CBCT detecting some leakage current so can anybody ans me , where i am going wrong or how to detect whether its actual leakage or CBCT malfunctioning.

662


WHAT IS MEANING OF Gg & Gg IN hrc FUSE

1547


In Dyn11 power transformer if any one of the 3 phases connected to earth in star connected side then please explain effect of the current flow in delta connected side of transformer.(In this case if one phase is shorted to ground in star connected side then we observe the current flow in two phases only not three phases in delta connected primary side. Please explain why it is so?)

362


if we have a industrial load of 400 kilowatts with 415 volt AC then how much total harmonic distortion (thd%) should be acceptable for steady power system.

676


i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value

537


What is the lower limit of break-down voltage of converter transformer.

613