1- The no-load current drawn by transformer is usually, the per cent of the full-load current is a) 0.2 to 5 per cent b) 2 to 5 per cent c) 12 to 15 5 per cent d) 20 to 30 per cent c) 0.5, d) 0.35 2- The power factor of a transformer on no load will be about a) unity, b) 0.75, 3- The efficiency of a transformer will be maximum when a) copper losses = hysteresis losses c) copper losses = iron losses b) eddy current losses = copper losses d) hysteresis losses = eddy current losses 4-During the short circuit test, the core losses are negligible. This is because a) The voltage applied across the high voltage side is a fraction of its rated voltage b) The current on the low voltage side is very small. c) The power factor is high d) iron becomes fully saturated 5-While conducting short-circuit test on a transformer, the following side is short circuited a) Secondary side, b) Low voltage side c) High voltage side d) Primary side
1- The no-load current drawn by transformer is usually, the per cent of the full-load current is a) 0.2 to 5 per cent b) 2 to 5 per cent c) 12 to 15 5 per cent d) 20 to 30 per cent c) 0.5, d) 0.35 2- The power factor of a transformer on no load will be about a) unity, b) 0.75, 3- The efficiency of a transformer will be maximum when a) copper losses = hysteresis losses c) copper losses = iron losses b) eddy current losses = copper losses d) hysteresis losses = eddy current losses 4-During the short circuit test, the core losses are negligible. This is because a) The voltage applied across the high voltage side is a fraction of its rated voltage b) The current on the low voltage side is very small. c) The power factor is high d) iron becomes fully saturated 5-While conducting short-circuit test on a transformer, the following side is short circuited a) Secondary side, b) Low voltage side c) High voltage side d) Primary side
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 3.9P
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