5- The emf induced in the windings of a transformer will. a)-lag the core flux by 90° b)-be in-phase with the core flux· c)- lead the core flux by 90° d)-be independent of the core flux 6- the efficiency of an autotransformer for the same output compared to a two-winding transformer is a) Greater , b) Lesser c) Poor d) None of these 7- The full-load efficiency of a transformer at 0.85 p.f. lag is 97 per cent. Its efficiency at full load 0.85 power factor lead will be (a) 99% (b) 96% (c) 97% (d) 98% 8- At 50HZ operation a single phase transformer has hysteresis loss of 200W and eddy current loss of 100 W ,Its core loss at 60HZ operation will be 432W b) 408W c) 384W d) 360W
5- The emf induced in the windings of a transformer will. a)-lag the core flux by 90° b)-be in-phase with the core flux· c)- lead the core flux by 90° d)-be independent of the core flux 6- the efficiency of an autotransformer for the same output compared to a two-winding transformer is a) Greater , b) Lesser c) Poor d) None of these 7- The full-load efficiency of a transformer at 0.85 p.f. lag is 97 per cent. Its efficiency at full load 0.85 power factor lead will be (a) 99% (b) 96% (c) 97% (d) 98% 8- At 50HZ operation a single phase transformer has hysteresis loss of 200W and eddy current loss of 100 W ,Its core loss at 60HZ operation will be 432W b) 408W c) 384W d) 360W
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 3.56P: Three single-phase two-winding transformers, each rated 3kVA,220/110volts,60Hz, with a 0.10 per-unit...
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