What is the physical significant of power factor?

0 Answers   Cooper,

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can anybody send the rrb chennai &rrb bopal question papers of 2006&2007.My exam is on 12 oct 2008.Its urgent

0 Answers  

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For polarity test on a 11/3.3kV 2.5MVA delta-star Unit Auxiliary transformer,415V 3-phase supply was applied at the HV. Connection between Aa was made with a 2.5mm cable. As soon as power was switched on the cable caught fire and burnt. This test was then abandoned. It is noteworthy to say that a similar cable was also used in a similar transformer for the same. The cable did not burn and test was successfully completed with good result. What is wrong? Please, help me out.

3 Answers  

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In some countries it is found that an Earthing Transformer is connected at the LV sides of the Transmission and Distribution Substation Transformers.Actually what is the purpose the Earthing Transformer?

1 Answers  

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why do we provide metallic enclosure to bus duct and then ground it?

1 Answers  

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what is mean by kneepoint voltage? when it will happen? ( my doubt is, if CT secondary is open means ct get saturation or blas? what are factors are required for calculations? plz give currect anws:

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what is the MNA in case of d.c. machin? whaty is the importance of it? hoe it affect the brush position?

2 Answers   TATA,

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How to know any size of cable if there are not written on cable? Answer must be theurical not by experience.

0 Answers   El Seif,

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why low pressure side of the turbine is connected to the alternator and not the high pressure side??

1 Answers  

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Can u Explain about the electronic trivector meter and the use of data converters in them?

0 Answers   Tricom,

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why dc supply is given to the field of alternator

9 Answers  

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which one is rotating transformer-single phase induction motor or 3 phase squirrel cage motor?

1 Answers  

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