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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.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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1. A 240-V d.c. shunt motor has an armature resistance of 0.4 Q 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.
Transcribed Image Text:1. A 240-V d.c. shunt motor has an armature resistance of 0.4 Q 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.
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