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A 220 V shunt motor has armature and field resistance of 0.2 2 and 220 2 respectively. The motor is driving a constant load torque and running at 1000 rpm drawing 10 A current from the supply. Calculate the new speed and armature current if an external armature resistance of value 5 N is inserted in the armature circuit. Neglect armature reaction and saturation. (793.96 rpm)

A 220 V shunt motor has armature and field resistance of 0.2 2 and 220 2 respectively. The motor is driving a constant load torque and running at 1000 rpm drawing 10 A current from the supply. Calculate the new speed and armature current if an external armature resistance of value 5 N is inserted in the armature circuit. Neglect armature reaction and saturation. (793.96 rpm)

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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110 ohms. Calculate the speed at which the motor runs, if (i) 1.5 ohm resister were introduced in series with the armature, (iii) 300 ohms resister were connected in series with the field winding, and load torque remaining the same throughout. Assume that field is proportional to field current. 5. A 220 V shunt motor has armature and field resistance of 0.2 Q and 220 O respectively. The motor is driving a constant load torque and running at 1000 rpm drawing 10 A current from the supply. Calculate the new speed and armature current if an external armature resistance of value 5 Q is inserted in the armature circuit. Neglect armature reaction and saturation. (793.96 rpm) 6. A 220 V d.c series motor has armature and field resistances of 0.15 N and 0.10 2 respectively. It takes a current of 30 A from the supply while running at 1000 rpm. If an external resistance of 1 2 is inserted in series with the motor, calculate the new steady state armature current and the speed. Assume the load torque remains constant.( 858.8 rpm) 7. When a generator is being driven at 1,200 rpm, the generated emf is 125 volts. Determine the generated emf (a) if the field flux is decreased by 10 percent with the speedremaining unchanged, and (b) if the speed is reduced to 1,100 rpm, the field flux remaining unchanged.( 112.5 volts, 114.6V) 8. A shunt motor runs at 1200 rpm on a 420 V circuit and current taken in 30 A in addition to the field current. What resistance must be placed in series with armature in order that the speed may be reduced to 600 rpm, the current through the armature remaining same.ra = 32 given. (5.5 2) 9. A 220 V DC series motor is running at a speed of 800 rpm and draws 100 A. Calculate at what speed the motor will run when developing half the toraue
Transcribed Image Text:110 ohms. Calculate the speed at which the motor runs, if (i) 1.5 ohm resister were introduced in series with the armature, (iii) 300 ohms resister were connected in series with the field winding, and load torque remaining the same throughout. Assume that field is proportional to field current. 5. A 220 V shunt motor has armature and field resistance of 0.2 Q and 220 O respectively. The motor is driving a constant load torque and running at 1000 rpm drawing 10 A current from the supply. Calculate the new speed and armature current if an external armature resistance of value 5 Q is inserted in the armature circuit. Neglect armature reaction and saturation. (793.96 rpm) 6. A 220 V d.c series motor has armature and field resistances of 0.15 N and 0.10 2 respectively. It takes a current of 30 A from the supply while running at 1000 rpm. If an external resistance of 1 2 is inserted in series with the motor, calculate the new steady state armature current and the speed. Assume the load torque remains constant.( 858.8 rpm) 7. When a generator is being driven at 1,200 rpm, the generated emf is 125 volts. Determine the generated emf (a) if the field flux is decreased by 10 percent with the speedremaining unchanged, and (b) if the speed is reduced to 1,100 rpm, the field flux remaining unchanged.( 112.5 volts, 114.6V) 8. A shunt motor runs at 1200 rpm on a 420 V circuit and current taken in 30 A in addition to the field current. What resistance must be placed in series with armature in order that the speed may be reduced to 600 rpm, the current through the armature remaining same.ra = 32 given. (5.5 2) 9. A 220 V DC series motor is running at a speed of 800 rpm and draws 100 A. Calculate at what speed the motor will run when developing half the toraue
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