Electrical Engineering Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

What is K-rated transformer? What is the use of it? What can be the size(pls provide calculation if possible) of K- factor transformer for 550kW,690V motor operating with drive (VFD)?

2242

what is the effect of power factor of machines in starting current

2014

How to calculate total harmonic distortion level(THD) in VFD? and how can we reduce harmonics?

Apollo,

4011

Describe: Energy efficient motors

Reliance,

1 3602

How to size a transformer which will supply power to 550kW,690V motor starting with VFD?

1 4206

Can any one provide the inspection procedure of MIMIC for VFD panel? Details: If someone wants to have a mimic in the VFD panel what are inputs considered for the mimic(like on,off,trip) whether we are able to add speed variation in the mimic(if so how can we get) and what are the parameters to be checked in the MIMIC during inspection?

2161

TO operate transformers in parallel, vector symbol of the both should be same.If one transformer name plate is not there, how can we conclude that whether the transformer is having the same vector symbol or not?

4 7682

what is the diffrence between voltage and current?

11 15644

why Line voltage =1.732XPhase voltage what mean by 1.732

IBM, NCC,

4 22776

what the purpose of transmited high voltage in over head lines

NCC,

3 6161

how to find impedance , mutual indatnce in transmission lines

NTPC,

2237

what purose of the double circuit transmission line phase of the line phase changed for circuit-1 for Circuit-2 R-Y-B B-Y-R

NCC,

2235

what the function breaker failure scheme, how is it operated

1875

Transformer TTR test procedure

Descon,

2 9159

Dear Sir, we met a disaster with our 62.5 kva genset, after rewinding we informed by our contract engg that due to return current coming in neutral & impropper earthing this happend. But after all set up & load balance we checked & found again we have about 20 to 32 amp return current on neutral. we have 12 airconditioner + 12 mini fridge on single phase line. Pl suggest any idea to solved this problem

3 5039

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Un-Answered Questions { Electrical Engineering }

Hello sir, pls send me hpcl technical test papers .i am. Appearing for the exam.

2685

what is the function of anti pumping relays? what is KVAR? How it is generated in alternator? What is 3rd Harmonics? What is IDMT relay?

2260

What is the basic principal, by which DC voltage level is increased more than the supplied AC voltage during conversion. As upto AC level it is contorrled by firing anlge but after maximum level how is it possible.Please clear picture. OR we have to supply the higher level AC?

1918

how current is reverse from its normal direction during the fault?

2410

how generator avr give to the input?

1949

what is deffrence between squirral cage and wound rotor in IM?

1926

what are pilot cells

2031

For overhead protection we use which transformer?

2429

Whether 3 phase induction motorwith 100 hp capacity , Amp 160 for which sensitive earth fault relay , type CTUM 15 can be used?

1439

redundant connection in contactor?

2449

if the number of poles generated in stator and rotor side of an induction motor are different then what will happen and why?

1845

What is the function of probe in cro?

1160

how to control the speed to switched reluctance motor

1905

A 100W electric lamp is supplied from a 115V, 60HZ source. The peak instantaneous power dissipated in the lamp filament is

2334

What is the abbreviation of NGT panel

1995

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