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Q3. A 230 V dc shunt Motor runs at 800rpm and takes armature current of 50A. Find the resistance to be added to the field circuit to increase speed to 1000rpm at an armature current of 80A. Assume armature resistance 0.152 and field winding resistance 25092 Y 800 rpm Fa₁ = 50 pr Y₁ = 100D 80 A

Q3. A 230 V dc shunt Motor runs at 800rpm and takes armature current of 50A. Find the resistance to be added to the field circuit to increase speed to 1000rpm at an armature current of 80A. Assume armature resistance 0.152 and field winding resistance 25092 Y 800 rpm Fa₁ = 50 pr Y₁ = 100D 80 A

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
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Q1. A shunt generator has an induced voltage on open circuit of 127 V, when the machine is loaded, terminal voltage is 120V. Find the load current if the field resistance is 150 and armature resistance is 0.0252. Ignore armature reaction. Q2. A 250V d.c shunt Machine has line current of 80A. it has armature and field resistance of 0.1 and 1252 respectively. Calculate power developed in armature when running as 2.1 Generator 2.2 Motor 12 = = 80 A. Q3. A 230 V dc shunt Motor runs at 800rpm and takes armature current of 50A. Find the resistance to be added to the field circuit to increase speed to 1000rpm at an armature current of 80A. Assume armature resistance 0.152 and field winding resistance 2500 r₂ =12502 та - алл Q4. Compute the efficiency of 100 kW, 250-V, 6-pole, 1000-rpm long shunt compound Generator. The Generator has the following parameters: Armature resistance Ra 0.015 2, Series field resistance Rs =0.010 2 and Shunt field resistance Rshf= 100.00, Total rotational losses = 4000 W. Assume stray losses to be 1% of the output and a brush drop of 2 volts. Y 800 rpm Y₂ = 100D UP F = 80 A V₂ - Taha 1/4-In Fa Q5.A 10-hp 230-V DC series motor has a line current of 37 A and a rated speed of 1200 rpm. The armature and series field resistances are 0.4 2 and 0.2 2 respectively. The total brush voltage drop is 2 V. Calculate the following: 5.1 Speed at a line current of 20 A. 5.2 No-load speed when the line current is 1 A. 5.3 Speed at 150% of the rated load when the line current is 60 A and the series field flux is 125% of the full load flux. = WN
Transcribed Image Text:Q1. A shunt generator has an induced voltage on open circuit of 127 V, when the machine is loaded, terminal voltage is 120V. Find the load current if the field resistance is 150 and armature resistance is 0.0252. Ignore armature reaction. Q2. A 250V d.c shunt Machine has line current of 80A. it has armature and field resistance of 0.1 and 1252 respectively. Calculate power developed in armature when running as 2.1 Generator 2.2 Motor 12 = = 80 A. Q3. A 230 V dc shunt Motor runs at 800rpm and takes armature current of 50A. Find the resistance to be added to the field circuit to increase speed to 1000rpm at an armature current of 80A. Assume armature resistance 0.152 and field winding resistance 2500 r₂ =12502 та - алл Q4. Compute the efficiency of 100 kW, 250-V, 6-pole, 1000-rpm long shunt compound Generator. The Generator has the following parameters: Armature resistance Ra 0.015 2, Series field resistance Rs =0.010 2 and Shunt field resistance Rshf= 100.00, Total rotational losses = 4000 W. Assume stray losses to be 1% of the output and a brush drop of 2 volts. Y 800 rpm Y₂ = 100D UP F = 80 A V₂ - Taha 1/4-In Fa Q5.A 10-hp 230-V DC series motor has a line current of 37 A and a rated speed of 1200 rpm. The armature and series field resistances are 0.4 2 and 0.2 2 respectively. The total brush voltage drop is 2 V. Calculate the following: 5.1 Speed at a line current of 20 A. 5.2 No-load speed when the line current is 1 A. 5.3 Speed at 150% of the rated load when the line current is 60 A and the series field flux is 125% of the full load flux. = WN
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