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Unformatted text preview: Problem Set #1 Basic concepts – complex algebra and threephase balanced circuits 11 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.12) Evaluate the following expressions in polar form: a) a1 b) 1 a 2 + a c) a 2 + a +j d) ja + a 2 12 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.13) Three identical impedances of 10 ∠15 ° Ω are Yconnected to balanced threephase line voltages of 208 V. Specify all the line and phase voltages and the currents as phasors in polar form with V ca as reference for a phase sequence of abc . 13 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.14) In a balanced threephase system the Yconnected impedances are 10 ∠ 30 ° Ω . If V bc =416 ∠ 90 ° V, specify I cn in polar form. 14 (Grainger and Stevenson, Jr. Chapter 1, Prob 1.16) Determine the current drawn from a threephase 440V line by a threephase 15hp motor operating at full load, 90% efficiency, and 80% powerfactor lagging. Find the values of P and Q drawn from the line....
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 Fall '07
 Keyhani
 Alternating Current, Volt, Electrical impedance, Power factor, Grainger

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