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a. A balanced delta connected load of 8+ j6 ohms per phase is connect to a 3- phase 230 V supply. What is the line current? • 40 A • 23 A • • b. The pulley of an old gen-set has a diameter of 20 inches. The belt exerts a pull of 353 lbs on the pulley. The gen set runs at 900 rpm. What is the approximate kW rating of the gen set? • 200 75 • 37.5 250 . • c. A 100 km transmission line has a 1,200 ohms shunt reactance? 120,000 ohms 12 ohms 46 A 80 A reactance. What is the per km shunt 120 ohms • 1,200 ohms

a. A balanced delta connected load of 8+ j6 ohms per phase is connect to a 3- phase 230 V supply. What is the line current? • 40 A • 23 A • • b. The pulley of an old gen-set has a diameter of 20 inches. The belt exerts a pull of 353 lbs on the pulley. The gen set runs at 900 rpm. What is the approximate kW rating of the gen set? • 200 75 • 37.5 250 . • c. A 100 km transmission line has a 1,200 ohms shunt reactance? 120,000 ohms 12 ohms 46 A 80 A reactance. What is the per km shunt 120 ohms • 1,200 ohms

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Solve ITEM 7 with complete GIVEN and STEP-BY-STEP SOLUTIONS.  

ITEM 5 a. The substation bus bar is made up of 2-inches round copper bar 20 ft. long. What is the resistance of each bar if the resistivity is 1.724 x 10^-6 ohm-cm. 2.96 x 10^-5 ohm 13.8 x 10^-6 ohm 5.185 x 10^-5 ohm 7.21 x 10^-5 ohm b. A three phase unbalanced currents are: la=10230 lb=0 Find the negative sequence current of phase b. ● 8.66230 . c. A three-phase system delivers 50 MVA of a balanced delta load of power factor 78%. Determine the size of capacitor bank necessary to raise the power factor to 90% 17.3 MVAR ● 11.4 MVAR ● ITEM 6 a. A 10 ohms R1, 30 ohms XL, and 60 ohms XL are connected in parallel across 220 volts 60 Hz source. What is the current in R1 in ampere? 22 ● 3.7 ● ● ● b. A single-phase distribution line is installed with two No. 8 copper conductors spaced 15 cm. The line is 6 km long and the GMR with No. 8 is 1.27x10^-3 m. What is the inductance with the line? 4.2 mH 9.5 mH ● ● ● 5.77260 c. The maximum tidal head available for a proposed total-power station is 6m. What must be the area of the tidal bay to generate an average of 1,500 MW of power? 178.2 sq. km 126.8 sq. km Ic=102150 12.4 MVAR 13.5 MVAR · 24.6 7.33 2.5 mH • 7.6 mH ITEM 7 a. A balanced delta connected load of 8+ j6 ohms per phase is connect to a 3- phase 230 V supply. What is the line current? 40 A 23 A ● 186.7 sq. km 190.3 sq. km . 46 A 80 A b. The pulley of an old gen-set has a diameter of 20 inches. The belt exerts a pull of 353 lbs on the pulley. The gen set runs at 900 rpm. What is the approximate kW rating of the gen set? 200 75 ● 37.5 • 250 c. A 100 km transmission line has a 1,200 ohms shunt reactance. What is the per km shunt reactance? ● 120,000 ohms ● 12 ohms 120 ohms 1,200 ohms
Transcribed Image Text:ITEM 5 a. The substation bus bar is made up of 2-inches round copper bar 20 ft. long. What is the resistance of each bar if the resistivity is 1.724 x 10^-6 ohm-cm. 2.96 x 10^-5 ohm 13.8 x 10^-6 ohm 5.185 x 10^-5 ohm 7.21 x 10^-5 ohm b. A three phase unbalanced currents are: la=10230 lb=0 Find the negative sequence current of phase b. ● 8.66230 . c. A three-phase system delivers 50 MVA of a balanced delta load of power factor 78%. Determine the size of capacitor bank necessary to raise the power factor to 90% 17.3 MVAR ● 11.4 MVAR ● ITEM 6 a. A 10 ohms R1, 30 ohms XL, and 60 ohms XL are connected in parallel across 220 volts 60 Hz source. What is the current in R1 in ampere? 22 ● 3.7 ● ● ● b. A single-phase distribution line is installed with two No. 8 copper conductors spaced 15 cm. The line is 6 km long and the GMR with No. 8 is 1.27x10^-3 m. What is the inductance with the line? 4.2 mH 9.5 mH ● ● ● 5.77260 c. The maximum tidal head available for a proposed total-power station is 6m. What must be the area of the tidal bay to generate an average of 1,500 MW of power? 178.2 sq. km 126.8 sq. km Ic=102150 12.4 MVAR 13.5 MVAR · 24.6 7.33 2.5 mH • 7.6 mH ITEM 7 a. A balanced delta connected load of 8+ j6 ohms per phase is connect to a 3- phase 230 V supply. What is the line current? 40 A 23 A ● 186.7 sq. km 190.3 sq. km . 46 A 80 A b. The pulley of an old gen-set has a diameter of 20 inches. The belt exerts a pull of 353 lbs on the pulley. The gen set runs at 900 rpm. What is the approximate kW rating of the gen set? 200 75 ● 37.5 • 250 c. A 100 km transmission line has a 1,200 ohms shunt reactance. What is the per km shunt reactance? ● 120,000 ohms ● 12 ohms 120 ohms 1,200 ohms
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