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Topic :: Transformer





Transformer Interview Questions
Questions Answers Views Company eMail

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

1953

Why a Transformer Noise during its running condition ??

NTPC, UPPCL,

11 22937

How the Transformer oil testing is done & Why oil dielectric goes LOW & what is solution for that ??

NTPC,

3 12827

What is the formula for calculating Transformer Losses & Efficiency. I want to compare the Transformer efficiency at different loading condition.

Rays Power Experts, Techser,

6 159657

transformer losses

1 4956

In transformers Which type of connection is preferred for harmonics to be minimum. primary : secondary star without neutral:open delta star with neutral :open delta star without neutral: delta star with neutral : delta explain why

Genco,

1 5135

The exciting current of a transformer is non sinusoidal. why?

2 11300

Give the selection criteria of a 3 Phase transformer for industrial purposes ?

NDDB, TATA,

5 12268

I have 11KV/415V power distribution transformer. I have found unbalance current in LT (415V) side. Also observed that unbalance voltage (3V) at LV side due to HV side unbalance voltage. What should I check for this? Also, the same LV side load can run in balance on captive power.

1 5258

Why Delta Star Transformers are used for Lighting Loads.

6 27403

In distribution transformers, fuse wires are very thin when compared to conductor size. How it's possible?

4 11480

Generally transformers has delta primary and star secondary. But in some transformer i saw Star primary and delta secondary. what is the reason for chosing like this?

2 4270

what r the checklist while installing 500 kva transformer

Pepsi,

2330

what happens when a power transformer neutral earthing broken???

MacLellan,

11 23094

When charging a 20 MVA , 33kV/6.6kV transformer through regulated (0-6.6 kV or 0-33 kV) source on no load , what will be the maximum current drawn by transformer from source and what sould be the source capacity.

TATA,

5 11697




Related Topics


Un-Answered Questions { Transformer }

Difference between PowerPlay transformer and power play reports?

2517


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

2657


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?

2081


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

2092


Draw the line diagram of diffretial relay connected to transformer?

2438


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

2376


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

4323


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

1997


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

2354


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

2134


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?

1926


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

1978


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

2077


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

1953


what r the checklist while installing 500 kva transformer

2330