Answered: 12. A 500 KVA transformer is having…

12. A 500 KVA transformer is having efficiency of 95% at full load and also at 60% of full load; both at unity power factor. Then P₁ is_ a) 16.45 kW b) 9.87 kW c) 14.57 kW d) Can't be calculated

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.4MCQ: An ideal transformer has no real or reactive power loss. (a) True (b) False

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Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

12. A 500 KVA transformer is having efficiency of 95% at full load and also at 60% of full load;
both at unity power factor. Then P, is
a) 16.45 kW
b) 9.87 kW
c) 14.57 kW
d) Can't be calculated

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