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18. A balanced three-phase loads draws 20 kW at 0.447 pf. Lagging from a 230 V, 60 Hz, three-phase transmission lines. Find the reading of the two wattmeter s properly connected to measure power a. 18.45 kW, 1.55 kW b. 21.55 kW, -1.55 kW c. 14.25 kW, 5.75 kW, d. 25.75 kW, -5.75 kW

18. A balanced three-phase loads draws 20 kW at 0.447 pf. Lagging from a 230 V, 60 Hz, three-phase transmission lines. Find the reading of the two wattmeter s properly connected to measure power a. 18.45 kW, 1.55 kW b. 21.55 kW, -1.55 kW c. 14.25 kW, 5.75 kW, d. 25.75 kW, -5.75 kW

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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18. A balanced three-phase loads draws 20 kW at 0.447 pf. Lagging from a 230 V, 60 Hz, three-phase transmission lines. Find the reading of the two wattmeter s properly connected to measure power c. 14.25 kW, 5.75 kw, d. 25.75 kW, -5.75 kW a. 18.45 kW, 1.55 kW b. 21.55 kW, -1.55 kW 19. Two watt-meter method is applied to a 3-phase motor running at full-load. The two wattmeter indicate 85.5 kW and 34.7 kW. What is the operating p.f. of the motor? a. 87.45% b. 89.49% c. 80.69% d. 94.76% 20. A 3-phase feeder carries two lagging balance loads. The power observed by each is measured by two wattmeter method, giving the following reading 1" load: W, = 160 kw W2 = 96 kW 2nd load: W, = 90 kw W, = 48 kW What is the combined kVA load on the feeder? a. 434.68 b. 504.24 c. 462.35 d. 420.12
Transcribed Image Text:18. A balanced three-phase loads draws 20 kW at 0.447 pf. Lagging from a 230 V, 60 Hz, three-phase transmission lines. Find the reading of the two wattmeter s properly connected to measure power c. 14.25 kW, 5.75 kw, d. 25.75 kW, -5.75 kW a. 18.45 kW, 1.55 kW b. 21.55 kW, -1.55 kW 19. Two watt-meter method is applied to a 3-phase motor running at full-load. The two wattmeter indicate 85.5 kW and 34.7 kW. What is the operating p.f. of the motor? a. 87.45% b. 89.49% c. 80.69% d. 94.76% 20. A 3-phase feeder carries two lagging balance loads. The power observed by each is measured by two wattmeter method, giving the following reading 1" load: W, = 160 kw W2 = 96 kW 2nd load: W, = 90 kw W, = 48 kW What is the combined kVA load on the feeder? a. 434.68 b. 504.24 c. 462.35 d. 420.12
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