1. A 240-V d.c. shunt motor has an armature resistance of 0.4 2 and field resistance of 110 Q. At no load, the speed is 1400 r.p.m and the armature current 2.2 A. On application of rated load, the speed drops to 1200 r.p.m. Determine the line current and power input when the motor delivers rated load. 2. 1-ph transformer has the following test results measured at the same Bmax: f/Hz: 20 40 50 60 80 100 Core loss/W: 6 24 ? 54 96 150 Calculate the hysteresis and eddy current losses at f-50HZ.
1. A 240-V d.c. shunt motor has an armature resistance of 0.4 2 and field resistance of 110 Q. At no load, the speed is 1400 r.p.m and the armature current 2.2 A. On application of rated load, the speed drops to 1200 r.p.m. Determine the line current and power input when the motor delivers rated load. 2. 1-ph transformer has the following test results measured at the same Bmax: f/Hz: 20 40 50 60 80 100 Core loss/W: 6 24 ? 54 96 150 Calculate the hysteresis and eddy current losses at f-50HZ.
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 3.28MCQ
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