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Question 4 a. Two impedances are connected in parallel to an ac supply of frequency 50 Hz. The first takes a current of 40 A at lagging phase angle of 30° and the second a current of 30 A at a leading phase angle of 45°, i. Draw a phasor diagram to represent the supply voltage, these currents and their resultant ii. Determine the total current taken from the supply and its phase angle i. Give the trigonometric representation of this current

Question 4 a. Two impedances are connected in parallel to an ac supply of frequency 50 Hz. The first takes a current of 40 A at lagging phase angle of 30° and the second a current of 30 A at a leading phase angle of 45°, i. Draw a phasor diagram to represent the supply voltage, these currents and their resultant ii. Determine the total current taken from the supply and its phase angle i. Give the trigonometric representation of this current

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Question 4 a. Two impedances are connected in parallel to an ac supply of frequency 50 Hz. The first takes a current of 40 A at lagging phase angle of 30° and the second a current of 30 A at a leading phase angle of 45°, i. Draw a phasor diagram to represent the supply voltage, these currents and their resultant Determine the total current taken from the supply and its phase angle ii. iii. Give the trigonometric representation of this current b. The load taken from an a.c. supply consists of: (a) a heating load of 15 kW; (b) a motor load of 40 kV A at 0.6 power factor lagging: (c) a load of 20 kW at 0.8 power factor lagging. Calculate the total load from the supply (in kW and kV A) and its power factor. What would be the kvar rating of a capacitor to bring the power factor to unity and how would the capacitor be connected?
Transcribed Image Text:Question 4 a. Two impedances are connected in parallel to an ac supply of frequency 50 Hz. The first takes a current of 40 A at lagging phase angle of 30° and the second a current of 30 A at a leading phase angle of 45°, i. Draw a phasor diagram to represent the supply voltage, these currents and their resultant Determine the total current taken from the supply and its phase angle ii. iii. Give the trigonometric representation of this current b. The load taken from an a.c. supply consists of: (a) a heating load of 15 kW; (b) a motor load of 40 kV A at 0.6 power factor lagging: (c) a load of 20 kW at 0.8 power factor lagging. Calculate the total load from the supply (in kW and kV A) and its power factor. What would be the kvar rating of a capacitor to bring the power factor to unity and how would the capacitor be connected?
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