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QUESTION 1 (13 Marks) Three identical coils are connected in delta to a 200 V, 3-ph supply and each takes 500 W. The power factor is 0.8 lagging. Calculate phase and line currents, and total power when the same Compare the two powers, of both star and delta connection, and coils are connected in star. make a comment. QUESTION 2 (12 Marks) P = IV A resistance pf 20 ohm, inductance of 0.2 H and capacitance of 150 µF are connected in series and are fed from 230 V, 50 Hz supply. Calculate (a) power factor (b) active power (c) reactive power (4) (4) QUESTION 3 (25 Marks) A factory has following loads connected to the mains supply of 415 V, 50 Hz: Load 1: 40 kVA, 0.75 lagging p.f. Load 2: 5 kVA, unity p.f. (a) Find the capacitance needed to correct the power factor of the factory to 0.95 lagging (18) (b) If the Power Utility's minimum power factor is 0.95, calculate the annual penalty fee. (7) (penalty rate is P20/kW/month)

QUESTION 1 (13 Marks) Three identical coils are connected in delta to a 200 V, 3-ph supply and each takes 500 W. The power factor is 0.8 lagging. Calculate phase and line currents, and total power when the same Compare the two powers, of both star and delta connection, and coils are connected in star. make a comment. QUESTION 2 (12 Marks) P = IV A resistance pf 20 ohm, inductance of 0.2 H and capacitance of 150 µF are connected in series and are fed from 230 V, 50 Hz supply. Calculate (a) power factor (b) active power (c) reactive power (4) (4) QUESTION 3 (25 Marks) A factory has following loads connected to the mains supply of 415 V, 50 Hz: Load 1: 40 kVA, 0.75 lagging p.f. Load 2: 5 kVA, unity p.f. (a) Find the capacitance needed to correct the power factor of the factory to 0.95 lagging (18) (b) If the Power Utility's minimum power factor is 0.95, calculate the annual penalty fee. (7) (penalty rate is P20/kW/month)

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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QUESTION 1 (13 Marks) Three identical coils are connected in delta to a 200 V, 3-ph supply and each takes 500 W. The power factor is 0.8 lagging. Calculate phase and line currents, and total power when the same Compare the two powers, of both star and delta connection, and coils are connected in star. make a comment. QUESTION 2 (12 Marks) P = IV A resistance pf 20 ohm, inductance of 0.2 H and capacitance of 150 µF are connected in series and are fed from 230 V, 50 Hz supply. Calculate (a) power factor (b) active power (c) reactive power (4) (4) QUESTION 3 (25 Marks) A factory has following loads connected to the mains supply of 415 V, 50 Hz: Load 1: 40 kVA, 0.75 lagging p.f. Load 2: 5 kVA, unity p.f. (a) Find the capacitance needed to correct the power factor of the factory to 0.95 lagging (18) (b) If the Power Utility's minimum power factor is 0.95, calculate the annual penalty fee. (7) (penalty rate is P20/kW/month)
Transcribed Image Text:QUESTION 1 (13 Marks) Three identical coils are connected in delta to a 200 V, 3-ph supply and each takes 500 W. The power factor is 0.8 lagging. Calculate phase and line currents, and total power when the same Compare the two powers, of both star and delta connection, and coils are connected in star. make a comment. QUESTION 2 (12 Marks) P = IV A resistance pf 20 ohm, inductance of 0.2 H and capacitance of 150 µF are connected in series and are fed from 230 V, 50 Hz supply. Calculate (a) power factor (b) active power (c) reactive power (4) (4) QUESTION 3 (25 Marks) A factory has following loads connected to the mains supply of 415 V, 50 Hz: Load 1: 40 kVA, 0.75 lagging p.f. Load 2: 5 kVA, unity p.f. (a) Find the capacitance needed to correct the power factor of the factory to 0.95 lagging (18) (b) If the Power Utility's minimum power factor is 0.95, calculate the annual penalty fee. (7) (penalty rate is P20/kW/month)
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