Exam1Solutions-Spring09

# Exam1Solutions-Spring09 - EEL 3211 Test 1 Feb 12 2009 Time...

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EEL 3211 Test 1 Feb. 12, 2009 Time limit: 50 minutes Show all work! 1. (50 Points) The toroidal coil shown has N = 25 turns. The inside diameter is ID = 5 cm and the outside diameter is OD = 5.5 cm. The cross sectional area A m of the material is circular. For a current of i = 3 A, calculate: a) (10 Points) The magnetic field intensity H along the mean path length within the toroid. b) (10 Points) The flux density B for a relative permeability of the core of r = 2000. c) 10 Points) The reluctance of the core. N 25  I 3  r 200  o 4 10 7  OD 0.055  ID 0.0  R mean 1 2 ID OD 2  R mean 0.02625 l mean 2 R mean  l mean 0.165 H N I l mean  H 454.728 B r o H  B 1.143

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d) (10 Points) The flux m in the core. e) (10 Points) The inductance L . 2. (50 Points) A balanced three-phase -load of pure resistances of 15 per phase is in parallel with a balanced Y-load having phase impedances of 8 +
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## This note was uploaded on 07/28/2011 for the course EEL 3211 taught by Professor Staff during the Summer '08 term at University of Florida.

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Exam1Solutions-Spring09 - EEL 3211 Test 1 Feb 12 2009 Time...

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