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Electrical Engineering Interview Questions
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Transformer cores are laminated in order to A simplify its construction B minimize eddy current loss C reduce cost D reduce hysterisis loss


A transformer has negative voltage regulation when its load PF is A zero B unity C lagging D leading

1 5147

Essential condition for parallel operation of two single phase transformer is that they should have same A polarity B kVA rating C voltage ratio D % impedance


1 7459

Saving in copper achieved by converting a 2 winding transformer in to an auto transformer is determined by A voltage transformation ratio B load on secondary C quality of core material D size of transformer core


kVA rating of ordinary transformer is increased when connected as an auto transformer because A transformation ratio increased B secondary voltage increased C energy is transferred both inductively and conductively D secondary current increased


At light load transformer efficiency is less because A secondary output is low B transformer losses are high C fixed loss is high compared to output D copper loss is small

1 3831

Which of the following connection is best suited for 3-ph, 4 wire system A delta-delta B star-star C delta-star D star-delta

2 6700

A T-T transformer can not be parallel with transformer A V-V B star-delta C star-star D delta-delta

1 3029

Following test should be conducted to find out relative polarity of transformenr terminals A no load test B back to back test C phasing out test D none of above


In power transformer tappings are provided on A high voltage side B low voltage side C In middle of both the windings D both high and low voltage side


2 3290

Main advantage of auto transformer over two windings transformer is that A it needs no cooling B it uses only one winding C core losses are reduced D it has simple construction


Material commonly used in making transformer core is A cast iron B mild steel C high silicom steel D high carbon steel

1 2160

If we impress a dc voltage of 230 V on an unloaded 230 V, 50 Hz transformer it wi A give high secondary voltage B burn out C give secondary voltage as per K D none of these


If we impress a dc voltage of 230 V on an unloaded 230 V, 50 Hz transformer it wi A give high secondary voltage B burn out C give secondary voltage as per K D none of these

1 1795

Short circuit voltage of a transformer mainly depend on A ohmic resistance of primary B ohmic resistance of secondary C magnitude of leakage flux D cross sectional area of core

1 7351

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Un-Answered Questions { Electrical Engineering }

What is the emf equation of a transformer?


H.t motor 6600 volt to same motor lt supply 440volt supply applyed to h.t motor to effect....


I am an American living in Vietnam and I have recently gotten a refrigerator from Japan and it is rated for 100 vac, but the power here is 220 so I bought a voltage stabilizer it has a 1 kva output rating. Can you please tell me what the amperage is? I'm confused and without a working fridge.


please send me the L&T Emb. sys. placement papers and entire details of pattren


why ct's&pt'S out put called as burden,why compelsary short ckt the secondary of ct's while removing the burden?


what are different types of electrical windings? i know the distributed winding ,concentrated winding etc but i want some detailed information, in what condition we will use distributed,concentrated windings what are the difference between them which is best, how induced emf changes by using different types of windings 20 hours ago - 1 week left to answer


can we use ZNyn11 transformer instead of Dyn11 transformer in distribution for effectively eliminating harmonics from the industrial loads.


hi, could someone help me to find a control design for syncronising panel .


list the advantages of RCCB over other circuit breakers?


if the armature current in a dc generator is ac ( sinusoidal ) why doesnt the sjhape af armature mmf a sinusoidal (ni) ? armature mmf in case of a dc machine is triangular.


can we use engine degreaser for electrical motors?


How Self works in DG set


Starting times for soft starter & power factor is thier any standard or datas available in manufactures list. Kindly suggest.


What is the difference between rated and per unit in transformer?