Course: Electrical Engineering Subject: Electrical Apparatus Instructions: • Write the GIVEN with their respective symbols and units. Do not skip the SOLUTIONS, do it step-by-step with their respective symbols and units • Round up to 3 three decimal places the FINAL ANSWERS and BOX it. Problem: A 400V, 3 - phase, 4 wire, star resistive loads of 15kW, 20kW and 25kW in the red, yellow and blue phases respectively. Determine the current flowing in each of the four conductors. connected system supplies three

Course: Electrical Engineering Subject: Electrical Apparatus Instructions: • Write the GIVEN with their respective symbols and units. Do not skip the SOLUTIONS, do it step-by-step with their respective symbols and units • Round up to 3 three decimal places the FINAL ANSWERS and BOX it. Problem: A 400V, 3 - phase, 4 wire, star resistive loads of 15kW, 20kW and 25kW in the red, yellow and blue phases respectively. Determine the current flowing in each of the four conductors. connected system supplies three

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter23: Special-purpose Outlets—electric Heating, Air Conditioning

Section23.1: Electric Heat

Problem 17R: Electric heating cable embedded in plaster, or sandwiched between layers of dry wall, creates heat....

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DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC CIRCUITS NOTE: Please solve in this way. 1. Please have a good handwriting, some of the answers are not readable. Thank you! 2. GIVEN.(include symbols and units) 3. REQUIRED/FIND/MISSING (with symbol/s) 4. ILLUSTRATION (Required). 5. STEP-by-STEP SOLUTION with Formulas and Symbols. No Shortcut, No skipping, and detailed as possible 6. FINAL ANSWERS must be rounded up to three decimal places PROBLEM: • A Y-connected load is supplied from a 400V, 3 -phase, 3-wire symmetrical system RYB. The branch circuit impedances are ZR=10V3+j10; Zy=20+j20v3 ZB=0-j10 Determine the current in each branch. Phase sequence is RYB.
DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC CIRCUITS NOTE: Please solve in this way. 1. Please have a good handwriting, some of the answers are not readable. Thank you! 2. GIVEN.(include symbols and units) 3. REQUIRED/FIND/MISSING (with symbol/s) 4. ILLUSTRATION (Required). 5. STEP-by-STEP SOLUTION with Formulas and Symbols. No Shortcut, No skipping, and detailed as possible 6. FINAL ANSWERS must be rounded up to three decimal places PROBLEM: • A 3-phase, 4-wire, 380V supply is connected to an unbalanced load having phase impedances of ZR=(8+j6)Ω, Zr=(8-j6)Ω and ZB=5 Ω. Impedance of the neutral wire is ZN=(0.5+j1)Ω. Ignoring the impedances ofline wires and internal impedances of the emf sources, find the phase currents and voltages of the load.
Please show a complete step-by-step solution. Thank youGive your final answers in at least 2 decimal places - make it 3 or 4 decimal places whenever required in the problem. If you are doing a step by step calculation, maintain 6 decimal places in your in-between calculations to hit good accuracy in your final answers. Use 1 hp = 746 Watts in your conversion whenever necessary. A 130-hp, three-phase, wye-connected, 50-Hz, 440-V, four-pole, cylindrical-rotor synchronous motor is operating at rated conditions and 86 percent power-factor leading. The efficiency, excluding field and stator losses, is 90 percent, and the synchronous reactance is 2.13 Ohms/phase. Determine the pull-out torque of the motor in lb-ft. Give your final answer in 2 decimal places. Correct Answer: 885.36 ± 0.01
4. Which of these can be installed without needing an electrical permit first? A. Hot tubB. Bank of lights at a football stadiumC. Building security system D. Basement furnace
DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC CIRCUITS NOTE: Please solve in this way. 1. Please have a good handwriting, some of the answers are not readable. Thank you! 2. GIVEN.(include symbols and units) 3. REQUIRED/FIND/MISSING (with symbol/s) 4. ILLUSTRATION (Required). 5. STEP-by-STEP SOLUTION with Formulas and Symbols. No Shortcut, No skipping, and detailed as possible 6. FINAL ANSWERS must be rounded up to three decimal places PROBLEM: • A 300V(line) 3-phase supply feeds a star-connected load consisting of non-inductive resistors of 15, 6 and 10Ω connected to the R, Y and B lines, respectively. The phase sequence is RYB. Calculate the voltage across each resistor.
Please show a complete step-by-step solution. Thank youGive your final answers in at least 2 decimal places - make it 3 or 4 decimal places whenever required in the problem. If you are doing a step by step calculation, maintain 6 decimal places in your in-between calculations to hit good accuracy in your final answers. Use 1 hp = 746 Watts in your conversion whenever necessary. A 110-hp, three-phase, wye-connected, 50-Hz, 460-V, four-pole, cylindrical-rotor synchronous motor is operating at rated conditions and 88 percent power-factor leading. The efficiency, excluding field and stator losses, is 95 percent, and the synchronous reactance is 2.81 Ohms/phase. Determine the developed torque in lb-ft. Give your final answer in 2 decimal places. Correct Answer: 405.42 ± 0.01
Assume that you were tasked to install a microwave oven using 12 AWG copper. When you look at the spec plate for the oven, you discover that the oven is rated for 240V, 60HZ, and takes a current of 25A. The location for the oven is 785.7 Ft, away from the breaker panel. Calculate the expected VD if any. Assume temperature to be 75 ̊ C what is the answer? VD?
Please show a complete step-by-step solution. Thank youGive your final answers in at least 2 decimal places - make it 3 or 4 decimal places whenever required in the problem. If you are doing a step by step calculation, maintain 6 decimal places in your in-between calculations to hit good accuracy in your final answers. Use 1 hp = 746 Watts in your conversion whenever necessary. A 110-hp, three-phase, wye-connected, 50-Hz, 450-V, four-pole, cylindrical-rotor synchronous motor is operating at rated conditions and 85 percent power-factor leading. The efficiency, excluding field and stator losses, is 95 percent, and the synchronous reactance is 3.82 Ohms/phase. Determine the magnitude of the excitation voltage in volts. Give your final answer in 2 decimal places. Correct Answer: 672.23 ± 0.01
A house has the following specifications for a circuit. Determine the size of the circuit breaker, wire, and size of pipe to be used for each circuit and the service entrance. Show a detailed computation and also tabulate the final answer. 15 lighting outlets1 kitchen range12 lighting outlets1 water heater at 1500 watts12 convenience outlet8 convenience outlet9 convenience outlet12 lighting outlet3 convenience outletspare-1500 wattsspare- 1500 watts
DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC CIRCUITS NOTE: Please solve in this way. 1. Please have a good handwriting, some of the answers are not readable. Thank you! 2. GIVEN.(include symbols and units) 3. REQUIRED/FIND/MISSING (with symbol/s) 4. ILLUSTRATION (Required). 5. STEP-by-STEP SOLUTION with Formulas and Symbols. No Shortcut, No skipping, and detailed as possible 6. FINAL ANSWERS must be rounded up to three decimal places PROBLEM: • A positive-sequence balanced three-phase wye-connected source with a phase voltage of 120 V supplies power to balanced wye-connected load. The per phase load impedance is 40+j10Ω. Determine the line currents in the circuit if <Van=0°.
DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC CIRCUITS NOTE: Please solve in this way. 1. Please have a good handwriting, some of the answers are not readable. Thank you! 2. GIVEN.(include symbols and units) 3. REQUIRED/FIND/MISSING (with symbol/s) 4. ILLUSTRATION (Required). 5. STEP-by-STEP SOLUTION with Formulas and Symbols. No Shortcut, No skipping, and detailed as possible 6. FINAL ANSWERS must be rounded up to three decimal places • If Vab = 480V in a balanced Y-connected three-phase generator, find the phase voltages, assuming the phase sequence is a. abc, b. acb
DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC CIRCUITS NOTE: Please solve in this way. 1. Please have a good handwriting, some of the answers are not readable. Thank you! 2. GIVEN.(include symbols and units) 3. REQUIRED/FIND/MISSING (with symbol/s) 4. ILLUSTRATION (Required). 5. STEP-by-STEP SOLUTION with Formulas and Symbols. No Shortcut, No skipping, and detailed as possible 6. FINAL ANSWERS must be rounded up to three decimal places PROBLEM: • The magnitude of the complex power (apparentpower) supplied by a three-phase balanced wye-wye system is 3600VA. The line voltage is 208Vrms. If the line impedance is negligible and the power factor angle of the load is 25°, determine the load impedance.