Solve ITEM 7 with complete GIVEN and STEP-BY-STEP SOLUTIONS. ITEM 5a. The substation bus bar is made up of 2-inches round copper bar 20 ft. long. What is theresistance of each bar if the resistivity is 1.724 x 10^-6 ohm-cm.2.96 x 10^-5 ohm13.8 x 10^-6 ohm5.185 x 10^-5 ohm7.21 x 10^-5 ohmb. A three phase unbalanced currents are:la=10230lb=0Find 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 6a. A 10 ohms R1, 30 ohms XL, and 60 ohms XL are connected in parallel across 220 volts 60 Hzsource. 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 theline?4.2 mH9.5 mH●●●5.77260c. The maximum tidal head available for a proposed total-power station is 6m. What must be thearea of the tidal bay to generate an average of 1,500 MW of power?178.2 sq. km126.8 sq. kmIc=10215012.4 MVAR13.5 MVAR·24.67.332.5 mH• 7.6 mHITEM 7a. A balanced delta connected load of 8+ j6 ohms per phase is connect to a 3- phase 230 Vsupply. What is the line current?40 A23 A●186.7 sq. km190.3 sq. km. 46 A80 Ab. The pulley of an old gen-set has a diameter of 20 inches. The belt exerts a pull of 353 lbs onthe pulley. The gen set runs at 900 rpm. What is the approximate kW rating of the gen set?20075●37.5• 250c. A 100 km transmission line has a 1,200 ohms shunt reactance. What is the per km shuntreactance?● 120,000 ohms● 12 ohms120 ohms1,200 ohms

According to the given questions, we need to solve 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 • • 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

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter18: Troubleshooting Modern Refrigeration, Heating, And Air-conditioning Control Circuitry And Systems

Section: Chapter Questions

Problem 19RQ

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