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Electrical Engineering Interview Questions

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

2331

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

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

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

1647

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

1647

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

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

6700

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

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

1234

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

NNN,

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

1955

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

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

1031

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

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

7351

Un-Answered Questions { Electrical Engineering }

What is the emf equation of a transformer?

202

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

976

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.

837

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

1409

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

985

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

1044

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

3700

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

916

list the advantages of RCCB over other circuit breakers?

865

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.

1079

can we use engine degreaser for electrical motors?

816

How Self works in DG set

906

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

1069

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

1282

I NEED RRB APTITUDE QUESTIONS AND MODEL PAPER,PLEASE SEND MY E-MAIL joo28_eee@yahoo.co.in

1017