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ITEM 12 a. A 4 pole, 60 Hz, 3-phase induction motor has a full load speed of 1750 rpm. What is the speed at half load in rpm? • 1775 • 1770 b. 100 Liters of H2O is to be heated from 20°C to 100°C. How many kWh of electric energy is needed? (Neglect heater losses) • • 875 . • 3500 9.3 kWh 4.5 kWh ● 8.7 kWh 6.5 kWh

ITEM 12 a. A 4 pole, 60 Hz, 3-phase induction motor has a full load speed of 1750 rpm. What is the speed at half load in rpm? • 1775 • 1770 b. 100 Liters of H2O is to be heated from 20°C to 100°C. How many kWh of electric energy is needed? (Neglect heater losses) • • 875 . • 3500 9.3 kWh 4.5 kWh ● 8.7 kWh 6.5 kWh

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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Solve ITEM 12 with complete GIVEN and STEP-BY-STEP SOLUTIONS.  

ITEM 11 a. The A 230-kV, 100-km, 60-Hz three-phase overhead transmission line with a rated current of 900 A/phase has a series impedance z = 0.088 + j0.465 02/km and a shunt admittance y = j3:524 µS/km. Determine the three-phase rated MVA of the line. 364.2 358.5 ● 351.7 ● 314.7 b. A 60-Hz single-phase, two-wire overhead line has solid cylindrical copper conductors with 1.5 cm diameter. The conductors are arranged in a horizontal configuration with 0.5 m spacing. Calculate in mH/km the total inductance of the line. ● 1.105 . ● ● 0.8899 ● c. A 250-W, 230-V, 50-Hz capacitor-start motor has the following constants for the main and auxiliary windings: Main winding, Zm= (4.5+ j 3.7) ohm. Auxiliary winding Za= (9.5+j 3.5) ohm. Determine the value of the starting capacitor that will place the main and auxiliary winding currents in quadrature at starting. 241 uF 223 uf ITEM 12 a. A 4 pole, 60 Hz, 3-phase uctio motor has a at half load in rpm? ● 1775 1770 ● ● ● . 0.05 1.780 load speed ● 211 uF 232 UF 875 3500 b. 100 Liters of H2O is to be heated from 20°C to 100°C. How many kWh of electric energy is needed? (Neglect heater losses) 9.3 kWh 4.5 kWh ● 8.7 kWh 6.5 kWh 1750 rpm. What is speed
Transcribed Image Text:ITEM 11 a. The A 230-kV, 100-km, 60-Hz three-phase overhead transmission line with a rated current of 900 A/phase has a series impedance z = 0.088 + j0.465 02/km and a shunt admittance y = j3:524 µS/km. Determine the three-phase rated MVA of the line. 364.2 358.5 ● 351.7 ● 314.7 b. A 60-Hz single-phase, two-wire overhead line has solid cylindrical copper conductors with 1.5 cm diameter. The conductors are arranged in a horizontal configuration with 0.5 m spacing. Calculate in mH/km the total inductance of the line. ● 1.105 . ● ● 0.8899 ● c. A 250-W, 230-V, 50-Hz capacitor-start motor has the following constants for the main and auxiliary windings: Main winding, Zm= (4.5+ j 3.7) ohm. Auxiliary winding Za= (9.5+j 3.5) ohm. Determine the value of the starting capacitor that will place the main and auxiliary winding currents in quadrature at starting. 241 uF 223 uf ITEM 12 a. A 4 pole, 60 Hz, 3-phase uctio motor has a at half load in rpm? ● 1775 1770 ● ● ● . 0.05 1.780 load speed ● 211 uF 232 UF 875 3500 b. 100 Liters of H2O is to be heated from 20°C to 100°C. How many kWh of electric energy is needed? (Neglect heater losses) 9.3 kWh 4.5 kWh ● 8.7 kWh 6.5 kWh 1750 rpm. What is speed
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