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Answer all questions from this section. Use a fresh page for each question. Question B1 [15 pts] An universal motor is very similar to a DC series motor in construction, but it is modified slightly to allow the motor to operate properly on AC power. A washing machine is driven by an universal motor, which is powered by single-phase AC source having 110 Vac and 60 Hz. The armature winding of the motor has the resistance and inductance of 0.4 Q2 and 3 mH, respectively. The field winding of the motor has the resistance and inductance of 0.8 02 and 6 mH, respectively. When the washing machine operates at half load torque, the motor draws 10 Aac and runs at 1000 rpm. Calculate the input current and speed of the motor when the washing machine operates at full load torque. At half load torque, (i) Calculate impedance of the armature and field windings. [3 pts] (ii) Calculate the average electromotive force (emf) and average current in the armature. [4 pts] At full load torque. (iii) Determine the average and root mean square armature current. [4 pts] (iv) Determine the average emf in the armature. [2 pts] (v) Determine the speed of the motor. [2 pts]

Answer all questions from this section. Use a fresh page for each question. Question B1 [15 pts] An universal motor is very similar to a DC series motor in construction, but it is modified slightly to allow the motor to operate properly on AC power. A washing machine is driven by an universal motor, which is powered by single-phase AC source having 110 Vac and 60 Hz. The armature winding of the motor has the resistance and inductance of 0.4 Q2 and 3 mH, respectively. The field winding of the motor has the resistance and inductance of 0.8 02 and 6 mH, respectively. When the washing machine operates at half load torque, the motor draws 10 Aac and runs at 1000 rpm. Calculate the input current and speed of the motor when the washing machine operates at full load torque. At half load torque, (i) Calculate impedance of the armature and field windings. [3 pts] (ii) Calculate the average electromotive force (emf) and average current in the armature. [4 pts] At full load torque. (iii) Determine the average and root mean square armature current. [4 pts] (iv) Determine the average emf in the armature. [2 pts] (v) Determine the speed of the motor. [2 pts]

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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Answer all questions from this section. Use a fresh page for each question. Question B1 [15 pts] An universal motor is very similar to a DC series motor in construction, but it is modified slightly to allow the motor to operate properly on AC power. A washing machine is driven by an universal motor, which is powered by single-phase AC source having 110 Vac and 60 Hz. The armature winding of the motor has the resistance and inductance of 0.4 Q2 and 3 mH, respectively. The field winding of the motor has the resistance and inductance of 0.8 02 and 6 mH, respectively. When the washing machine operates at half load torque, the motor draws 10 Aac and runs at 1000 rpm. Calculate the input current and speed of the motor when the washing machine operates at full load torque. At half load torque, (i) Calculate impedance of the armature and field windings. [3 pts] (ii) Calculate the average electromotive force (emf) and average current in the armature. [4 pts] At full load torque. (iii) Determine the average and root mean square armature current. [4 pts] (iv) Determine the average emf in the armature. [2 pts] (v) Determine the speed of the motor. [2 pts]
Transcribed Image Text:Answer all questions from this section. Use a fresh page for each question. Question B1 [15 pts] An universal motor is very similar to a DC series motor in construction, but it is modified slightly to allow the motor to operate properly on AC power. A washing machine is driven by an universal motor, which is powered by single-phase AC source having 110 Vac and 60 Hz. The armature winding of the motor has the resistance and inductance of 0.4 Q2 and 3 mH, respectively. The field winding of the motor has the resistance and inductance of 0.8 02 and 6 mH, respectively. When the washing machine operates at half load torque, the motor draws 10 Aac and runs at 1000 rpm. Calculate the input current and speed of the motor when the washing machine operates at full load torque. At half load torque, (i) Calculate impedance of the armature and field windings. [3 pts] (ii) Calculate the average electromotive force (emf) and average current in the armature. [4 pts] At full load torque. (iii) Determine the average and root mean square armature current. [4 pts] (iv) Determine the average emf in the armature. [2 pts] (v) Determine the speed of the motor. [2 pts]
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