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ITEM 3 1. A 220 volts series motor when running at 800-RPM draws a current of 100 amperes. The combined resistance of the armature and series field is 0.1-0. What is the speed when the motor develops ½ of the original torque? 1600 RPM 1225 RPM 1147 RPM 1690 RPM • 2. A 3-phase 150 hp, 60 Hz, 460 volts, 6 pole induction motor has a full load torque of 679 lb-ft.

ITEM 3 1. A 220 volts series motor when running at 800-RPM draws a current of 100 amperes. The combined resistance of the armature and series field is 0.1-0. What is the speed when the motor develops ½ of the original torque? 1600 RPM 1225 RPM 1147 RPM 1690 RPM • 2. A 3-phase 150 hp, 60 Hz, 460 volts, 6 pole induction motor has a full load torque of 679 lb-ft.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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ITEM 1 a. A 220-V long shunt compound motor ha an armature resistance of 0.54-02 and a series field resistance of 0.12-Q. What is the counter EMF if the armature current is 15 amperes. • 220 volts 210 volts 205 volts . 230 volts b. Three single phase, 10 KVA transformer connected delta-delta supply a balanced 3-phase wye-connected load of 26kVA. One transformer is removed for repair. Find the KVA load of each remaining transformer. ● c. Three 150-ohm resistors are connected in wye across 480 Volts, 3-phase source. If one of the resistors is open, what is the power absorbed by the remaining resistors? 768 W 1,536 W 35 15 ● ITEM 2 a. A current is given by this equation 1 = 2t^3+ t^2 + 3, a capacitor has an initial charge of 6.83 coulomb. What should be the charge of the capacitor after 5 sec? 375.8 362.4 ● x 10^-3 ohm • ● ● ● b. A 0-10 ampere ammeter has an internal resistance of 0.01 ohm. What shunt resistance to the ammeter must be connected to have a reading of 0 - 100? 1.11 x 10^-3 ohm ● 2.8% 25 30 · 2,304W 1,152 W ITEM 3 1. A 220 volts series motor when running at 800-RPM draws a current of 100 amperes. The combined resistance of the armature and series field is 0.1-0. What is the speed when the motor develops 2 of the original torque? 1600 RPM 1225 RPM 385.7 369.1 ● 2. A 3-phase 150 hp, 60 Hz, 460 volts, 6 pole induction motor has a full load torque of 679 lb-ft. What is the full load slip? • 4% ohm 0.111 ohm 1147 RPM 1690 RPM 1.5% 3% 3. A diversity factor of 2.5 gives a savings of percent in the generating equipment. ● 76 26 ● 40 ● 60
Transcribed Image Text:ITEM 1 a. A 220-V long shunt compound motor ha an armature resistance of 0.54-02 and a series field resistance of 0.12-Q. What is the counter EMF if the armature current is 15 amperes. • 220 volts 210 volts 205 volts . 230 volts b. Three single phase, 10 KVA transformer connected delta-delta supply a balanced 3-phase wye-connected load of 26kVA. One transformer is removed for repair. Find the KVA load of each remaining transformer. ● c. Three 150-ohm resistors are connected in wye across 480 Volts, 3-phase source. If one of the resistors is open, what is the power absorbed by the remaining resistors? 768 W 1,536 W 35 15 ● ITEM 2 a. A current is given by this equation 1 = 2t^3+ t^2 + 3, a capacitor has an initial charge of 6.83 coulomb. What should be the charge of the capacitor after 5 sec? 375.8 362.4 ● x 10^-3 ohm • ● ● ● b. A 0-10 ampere ammeter has an internal resistance of 0.01 ohm. What shunt resistance to the ammeter must be connected to have a reading of 0 - 100? 1.11 x 10^-3 ohm ● 2.8% 25 30 · 2,304W 1,152 W ITEM 3 1. A 220 volts series motor when running at 800-RPM draws a current of 100 amperes. The combined resistance of the armature and series field is 0.1-0. What is the speed when the motor develops 2 of the original torque? 1600 RPM 1225 RPM 385.7 369.1 ● 2. A 3-phase 150 hp, 60 Hz, 460 volts, 6 pole induction motor has a full load torque of 679 lb-ft. What is the full load slip? • 4% ohm 0.111 ohm 1147 RPM 1690 RPM 1.5% 3% 3. A diversity factor of 2.5 gives a savings of percent in the generating equipment. ● 76 26 ● 40 ● 60
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