A 240 V, 100 A armature full-load line current, 1000 RPM, shunt DC motor is consideredin this problem. Its characteristics are given below:RA = 0.20 92RF = 50 52This motor has compensating windings and interpoles.The magnetization curve for this motor at 1000 RPM is shown in a tabular form below:If, AEA, VandNF 2000 turnsFor Radj between 50 2 and 4502, find the range of no-load speed of this motor.Answers: Enter the low range speed first and the high range speed next.The range of speed is between :RPM0 0.1 0.2 0.4 0.48 0.6 0.8 1.0 1.2 1.6 1.8 2.0 2.2 2.46.0 25 50 100 135 160 205 235 255 275 285 288 290 291

A 240 V, 100 A armature full-load line current, 1000 RPM, shunt DC motor is considered in this problem. Its characteristics are given below: RA = 0.20 2 RF = 50 52 NF-2000 turns This motor has compensating windings and interpoles. The magnetization curve for this motor at 1000 RPM is shown in a tabular form below: and If, A 0 0.1 0.2 0.4 0.48 0.6 0.8 1.0 1.2 1.6 1.8 2.0 2.2 2.4 EA,V 6.0 25 50 100 135 160 205 235 255 275 285 288 290 291 For Radj between 502 and 4502, find the range of no-load speed of this motor. Answers: Enter the low range speed first and the high range speed next. The range of speed is between :

A 240 V, 100 A armature full-load line current, 1000 RPM, shunt DC motor is considered in this problem. Its characteristics are given below: RA = 0.20 2 RF = 50 52 NF-2000 turns This motor has compensating windings and interpoles. The magnetization curve for this motor at 1000 RPM is shown in a tabular form below: and If, A 0 0.1 0.2 0.4 0.48 0.6 0.8 1.0 1.2 1.6 1.8 2.0 2.2 2.4 EA,V 6.0 25 50 100 135 160 205 235 255 275 285 288 290 291 For Radj between 502 and 4502, find the range of no-load speed of this motor. Answers: Enter the low range speed first and the high range speed next. The range of speed is between :

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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A 200 V D.C. shunt motor takes 20 A at rated voltage and runs at 1000 r.p.m. Itsarmature resistance is 0.1 ohm. Calculate the value of additional resistance requiredin the armature circuit to reduced the speed to 800 r.p.m when the load torque isindependent of the speed.Ignore the field current. (Ans.1.98 ohm)
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The armature resistance of a shunt motor fed from a 220 Volt DC source is 5 ohms and the resistance of the excitation winding is R ohm and it rotates stably. Then, a resistance of R ohm is added to the excitation circuit (a resistor with the same value as the winding resistance) to control the speed. How many RPM is the motor in the last state in steady state.Mechanical losses will be neglected, motor magnetically linear, no saturation, temperature change will be neglected.Armature current = Ia = 3 ALoad torque=Tload= 8 Nma) 143 rpmb) 734 rpmc) 1361 rpm d) 77 rpm e) 1333 rpm
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22. A) Why is the power factor of a lightly loaded 3-phase squirrel-cage induction motor very low? a) most of the power supplied to the motor at light loads is magnetization or inductive power b) most of the power supplied to the motor at light loads is resistive power c) most of the power supplied to the motor at light loads is capacitive power d) none of the above B) What happens to the power factor as load is increased on the motor? a) the power factor increases b) the power factor deceases c) remains the same
A DC motor should be operated in a strong field which is due to the What happens to if suddenly goes a) nothing, it continues rotating b) it over speeds c) it stops rotating current if moter if rotating to zero. as before
The armature resistance of a shunt motor fed from a 220 Volt DC source is 5 ohms and the resistance of the excitation winding is R ohm and it rotates stably. Then, a resistance of R ohm is added to the excitation circuit (a resistor with the same value as the winding resistance) to control the speed. How many RPM is the motor in the last state in steady state.Mechanical losses will be neglected, motor magnetically linear, no saturation, temperature change will be neglected.Armature current = Ia = 4 ALoad torque=Tload= 7 Nm
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A 500 V DC shunt motor takes 4 A at no-load. The shunt field winding resistance and the armature winding resistance are 250 and 0.2 respectively. Find the efficiency when the motor draws a current of 10 A at full load.