Topic :: Transformer





Transformer Interview Questions
Questions Answers Views Company eMail

what happens when we apply dc to a transformer

Siemens,

7 9194

why transformer rating is always in KVA

GNG, NTPC,

7 8826

when transformer oil should be filtered/tested?

 3 4946

how many winding in the single phase transformer?

 3 4459

why transformer rating is expressed in kva.

Electrosteel, L&T,

4 8711

how to measure the transformer resistance values(dyn11)?and howmuch the minimum value?

 1671

why in scott connection of transformers, main transformer is tapped at 50% and teaser transformer at 86.6%?

Bhel, Bosch, College School Exams Tests, Wipro,

5 31474

What is power supply transformers?

Amara Raja,

2 4916

What is the main difference between power transformer and Distribution transformer?

APTransco, Bhel, NTPC,

9 9341

why can't we provide dc supply to a transformer?

 2 3759

why are caluculte transformers or dg's in kva does not caluculate in kw

 5 5221

Why transformer rating in KVA? and Generator also?

Bhel, IEEE, Toyo Denki, Toyo Engineering,

6 11280

what will happen if the input of a transformer is dc?

Hindalco,

10 8993

1. which type of transformer connection is preferred in case of power supply transformers? (A) Star/Star (B) Delta/Delta (C) Star/Delta (D) Zig Zag/Star 2. In a power transformer usuall which winding is closer to the core? (A) Primary winding (B) Secondary winding (C) Low Voltage winding (D) High Voltage winding 3. The power factor of a purely inductive load is (A) Zero (B) Lagging (C) Leading (D) Unity.

CECRI_Central_Electrical_Research_Institute,

9 10450

why transformer is rated in kva instead of kw?

 1 4079



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Un-Answered Questions { Transformer }

Difference between PowerPlay transformer and power play reports?

2074

All tape of electrical questions Answers tape of motor transformer e.o.t crane

2118

If one tertiary phase i.e. R,Y or B is earthed of a loaded type tertiary delta connected (Without load)of a power auto transformer, what is its advantage/disadvantage?

1617

what is R Core Transformer. how it differs from normal transformers. dont search in net and post the answer.

1611

Draw the line diagram of diffretial relay connected to transformer?

1971




How to select the earthing transformer,for DELTA TO DELTA TRANSFORMER OR ALTERNATOR SIDE.Pls post your answers and calculation.

1872

Why Transformer Neutral having one earth pit ( more earth electrode resistance) whereas body have many earth pit ( less earth electrode resistance)?

3849

how we arrange the hv side with delta connection in case 33/11kv of transformer.

1550

what is the criterion for selecting vector group of Transformers ? i mean how to decide vector group of Generator transformer, substation trasformer and transformer at consumer end

1769

i need the curve duty cycle and amper for (150 kva @50% dyty cycle) transformer turn ratio :19 and vin 400

1628

what is the effect of connecting three phase supply lines to three phase auto transformer output terminals through a fuse of 10Amp and a circuit breaker (MCB). Is this connection permanently destroy the transformer?

1475

How is the percentage impedence of a transformer fixed at design stage???

1506

How a capacitor discharge weld power supply works? what is the use of a pulse transformer?

1581

what is a pulse transformer? how rise time of pulse changes when ever the voltage changes?

1490

what r the checklist while installing 500 kva transformer

1811