26. A 200 KVA transformer has an iron loss of 1 kW and full-load Cu loss of 2kW. Its load kVA cor- responding to maximum efficiency is ....... kVA. (a) 100 (b) 141.4 (c) 50 (d) 200 If Cu loss of a transformer at 7/8th full load is 4900 W, then its full-load Cu loss would be .......watt. (a) 5600 (b) 6400 (c) 375 (d) 429 28. The ordinary efficiency of a given transformer is maximum when (a) it runs at half full-load (b) it runs at full-load (c) its Cu loss equals iron loss (d) it runs slightly overload. 29. The output current corresponding to maximum efficiency for a transformer having core loss of 100 W and equivalent resistance referred to secondary of 0.25 $2 is....... ampere. (a) 20 (b) 25 (c) 5 (d) 400 30. The maximum efficiency of a 100-kVA trans- former having iron loss of 900 kW and F.L. Cu loss of 1600 W occurs at....... kVA. (a) 56.3 (b) 133.3 (c) 75 (d) 177.7 27. 1
26. A 200 KVA transformer has an iron loss of 1 kW and full-load Cu loss of 2kW. Its load kVA cor- responding to maximum efficiency is ....... kVA. (a) 100 (b) 141.4 (c) 50 (d) 200 If Cu loss of a transformer at 7/8th full load is 4900 W, then its full-load Cu loss would be .......watt. (a) 5600 (b) 6400 (c) 375 (d) 429 28. The ordinary efficiency of a given transformer is maximum when (a) it runs at half full-load (b) it runs at full-load (c) its Cu loss equals iron loss (d) it runs slightly overload. 29. The output current corresponding to maximum efficiency for a transformer having core loss of 100 W and equivalent resistance referred to secondary of 0.25 $2 is....... ampere. (a) 20 (b) 25 (c) 5 (d) 400 30. The maximum efficiency of a 100-kVA trans- former having iron loss of 900 kW and F.L. Cu loss of 1600 W occurs at....... kVA. (a) 56.3 (b) 133.3 (c) 75 (d) 177.7 27. 1
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 3.7P: Consider a source of voltage v(t)=102sin(2t)V, with an internal resistance of 1800. A transformer...
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