Chapter 8 Homework Key.325

# Chapter 8 Homework - AGSM 325 Chapter 8 Key 1a(120 X 60 2 = 1b(120 X 60 4 = 1c(120 X 60 6 = 3600 rpm 1800 rpm 1200 rpm 2(120 X 50 6 = 1000 rpm 3a

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AGSM 325 - Chapter 8 Key 1a (120 X 60) / 2 = 3600 rpm 1b (120 X 60) / 4 = 1800 rpm 1c (120 X 60) / 6 = 1200 rpm 2 (120 X 50) / 6 = 1000 rpm 3a 2238 / (12 x 240) = 0.78 3b 12 X 240 = 2880 VA 3c +2238/746 = 3 hp 3d (2238 X .75) / 746 = 2.25 hp 3 hp X .75 = 2.25 hp 4a 0.8 X 120 X 34 = 3264 W 4.375 hp 4b 3 / 4.375 = 68.70% 4c 3264 x 100 X 0.06 / 1000 = \$19.58 5a 30000 X 8.333 X 159 = 39748410 5b 39748410 / (2 X 60 X 33000) = 10.04 hp 5c 10.04 / 0.45 = 22.31 hp 6 Size copper wire: 3 hp, 240 V, single phase, 30 meters From Table A.3, 240 V, 3 Hp = 17 amps Allowable Vdrop = 2% X 240 = 4.8 V Ohms = 4.8 V / (1.25 X 17) = 0.226 ohms (0.226 / 60 ) X 1000 = 3.7666 ohms/1000 meters #10 Cu THW

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7 Size Aluminum wire: 5 hp, single phase, 12 meters From Table A.3, 240 V, 5 Hp = 28 amps Allowable Vdrop = 2% X 240 = 4.8 V Ohms = 4.8 V / (1.25 X 28) = 0.137 ohms (0.137 / 24 ) X 1000 = 5.708 ohms/1000 meters # 8 Al UF From Table A.3, 120 V, 5 Hp = 56 amps Allowable Vdrop = 2% X 120 = 2.4 V Ohms = 2.4 V / (1.25 X 56) = 0.03427 ohms
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## This note was uploaded on 03/30/2008 for the course AGSM 325 taught by Professor Stark during the Spring '08 term at Texas A&M.

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Chapter 8 Homework - AGSM 325 Chapter 8 Key 1a(120 X 60 2 = 1b(120 X 60 4 = 1c(120 X 60 6 = 3600 rpm 1800 rpm 1200 rpm 2(120 X 50 6 = 1000 rpm 3a

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