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Exam3Solutions-Spring08

# Exam3Solutions-Spring08 - EEL 3211 Test 3 April 7 2008 Time...

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EEL 3211 Test 3 April 7, 2008 Time limit: 50 minutes. One (1) 8.5’ by 11’ sheet of notes allowed. All answers must include units. These problems are mostly one-liners for each part! No internet access of any kind is permitted 1. (5 points) A turbine turning at 200 rpm is connected to a synchronous generator. If the induced frequency is 60 Hz, how many poles does the rotor have? 12 0 60 12 0 12 0 poles or 18 pairs of N and S poles 200 36 f n fp Pn = = == 2. (15 points) A 3-phase synchronous generator produces an open-circuit line voltage of 6928 V with a DC field current of 50 A. If the generator terminals are short-circuited the resulting line currents are 800 A. a) (5 points) Calculate the synchronous reactance per-phase (neglect winding resistance). b) (10 points) Calculate the terminal voltage if three 12 resistors are connected in wye across the terminals. 2 2 25 692 8 4000 ) 400 0, 800 33 4000 ) 1 1 3 , 308 13 30 81 5 2 36 60 96 42 3 LS AS A S L EE a E VX I E bZ R X IA Z V I R V VV V ff = = = = = + = +=Ω= = × 3. (15 points)

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Exam3Solutions-Spring08 - EEL 3211 Test 3 April 7 2008 Time...

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