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Doctors Medicines MCQs Q&A

  1. Percentage impedance should be the same
  2. Polarity should be the same
  3. kVA rating should be the same
  4. Voltages should be the same
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Option 3 : kVA rating should be the same

Conditions for parallel operation of transformer:

For parallel connection of transformers, primary windings of the transformers are connected to source bus bars and secondary windings are connected to the load bus bars. Various conditions that must be fulfilled for the successful parallel operation of transformers are:

  • Same voltage ratio and turns ratio (both primary and secondary voltage rating is same)
  • Same percentage impedance and X/R ratio.
  • Identical position of tap changer
  • Same phase angle shift (vector group are same)
  • Same frequency rating
  • Same polarity
  • Same phase sequence
     

The mandatory conditions are same phase angle shift, same polarity, same phase sequence, and same frequency.

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Related Questions

In the following question the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct.. 1. Industrially raised chicken can be abnormally forceful, and are regularly kept in obscured sheds to avoid them pecking at each other. P. The feathered creatures invested much a greater amount of their energy—up to a third—pecking at the lifeless things in the pens, as opposed to fowls in different pens which invested a considerable measure of time assaulting others. Q. In low light conditions, they carry on less pugnaciously, yet are more inclined to ophthalmic scatters and respiratory issues. R. In an examination, forceful head-pecking was everything except killed among fowls in the improved condition. S. Modifying the birds’ condition, by adding parcels of wood-shavings to their pens, can work wonders. 6. Bundles could lessen forcefulness and decrease wounds; they may even enhance efficiency, since a glad chicken is a profitable chicken.?
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