Answer / prometheus

if we consider the construction of transformer there are two
type......as stated over.......shell type and core type. But
if we see it by its use...there are three types of
transformers....1)current transformers....2)Potential
transformers....3)Power transformers.....and if we see it by
its working principle, then there are two type of
transformers...1)step up....2)step down....there is another
type of transformer .....auto transformer

Answer / r a m e s h

As to consider the construction of transformer there are two types
one is shell type other is core type. Ffrom the operation point of view it
Step up(CT), step down (PT)
Others are varic type called auto transformer
specifictransformer is ionisation transformer.

Answer / vamsi

two types core & shell

If a 3 phase transformer is a 500 kva using the formulae 500kva= 500000/433 x 1.732 = 666.71amps does this mean that each phase on the secondary side is 666.71

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please, Send me last technical test question paper in my email id..

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where we use zero sequence current transformer or core balancing ct.

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(1)The demand for electricity , the amount of renewable generation available, the amount of fossil fuel generation available and the cost of the fossil fuel generation are shown in table below period(hrs) demand(MW) renewable (MW) fossil- fuel(MW) cost of fossil fuel(MW) 00.00 - 01.00 2000 1800 2000 30 01.00 - 02.00 2300 2500 2000 30 02.00 - 03.00 2500 2700 2100 45 03.00 - 04.00 2900 3100 2100 50 04.00 - 05.00 2700 2600 2500 45 05.00 - 06.00 2400 2000 2700 50 06.00 - 07.00 2200 1800 2000 36 07.00 - 08.00 2100 1600 2000 36 Assuming that the renewable generation incurs zero cost, determine an optimal generation schedule(specifying the amount of renewable generation and fossil fuel generation used in each period, the cost for each period and the overall cost for 8 hours.)

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