srihari


{ City } hyderabad
< Country > india
* Profession *
User No # 86306
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Answers / { srihari }

Question { 2691 }

what are the alternator cooling system? how it is represented?


Answer

Hydrogen cooling is preferred because the specific heat is
14.5
times than air and it is less weight.
air cooling and water cooling are other types of cooling
arrangements

Is This Answer Correct ?    1 Yes 0 No

Question { MPSC, 7339 }

The iron loss in a 100kva transformer is 1 kw and full load
copper losses are 2 kw, then what is maximum efficiency occure
at a load?


Answer

The load is not given so let us assume the load is resistive load.
therefore power factor is unity and at maximum efficiency copper losses = iron losses = 1kw.
100*10^3*1
efficiency= ------------------- = 98.03%
100*10^3*1+1000+1000

Is This Answer Correct ?    2 Yes 6 No