Test 2 EMN3A11 2012.pdf - TEST 2 –11 May 2012 Course Engineering Duration 90 min Paper Electromagnetics 3A Marks 50 Examiner Dr MJ Russell Notes 1 2 3

Test 2 EMN3A11 2012.pdf - TEST 2 –11 May 2012 Course...

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TEST 2 –11 May 2012 Course: / Engineering Duration: 90 min Paper: / Electromagnetics 3A Marks: 50 Examiner: Dr MJ Russell Notes: 1. Answer all questions and show all steps. 2. Work neatly and show all calculations. 3. All assumptions should be stated clearly. 4. One A4-sheet with only equations on both sides may be taken into the test venue. This sheet has to be handed in with the answer sheet. OUTCOME C [25] Question 1 a. Draw a full equivalent circuit of a practical transformer and briefly explain the origin of each of the components. How do these components react (increase/decrease) with a change in operating frequency. (11) b. Explain how core losses can be reduced through the correct choice of core material used at higher frequencies. (3) c. What can be done to reduce the conductor losses in transformers operating at higher frequencies? (3) Question 2 A speaker of 9 resistive impedance is connected to a supply of 10V with an internal resistive
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  • Fall '16
  • Electric motor, Electrical resistance, 500W, 90 min, 7.45kW

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