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1. Define Pitch Factor /Distribution Factor and present the formula to calculate. 2. Draw the

1. Define Pitch Factor /Distribution Factor and present the formula to calculate. 2. Draw the

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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EM2 Question Bank mid 1. Define Pitch Factor /Distribution Factor and present the formula to calculate. 2. Draw the double layer winding layout for a 24 slot stator and 4 pole alternator 3. An alternator having 10-poles, 3-phase, and 60 Hz has 8 conductors per slot in single layer arrangement with 4 slots/pole/phase. The coil span of the alternator is 1 to 8. The flux per pole has fundamental component of 0.03 Wb. Determine the total e.m.f induced per phase. 4. (i) Calculate the coil factor Kc given two sides of a coil are 165° apart. (ii). A 4-pole alternator has 60 slots. Calculate the distribution factor kd. 5. Find the no load phase and line voltage of a star connected, 4-pole alternator having flux per pole of 0.11 Wb sinusoidally distributed. 6 slots/pole/phase, 4 conductors/slot, double layer winding with a coil span of 150°. 6. With proper sketches, describe the armature reaction for a alternator when loaded with (a). unity PF (b) PF 0 lag and (c) PF O lead. 7. Determine the Voltage regulation of a 20 KVA 230 V, 1-4 alternator having Ra=0.01 0 and Xs= 0.1 for (a) unity PF (b) 0.75 lag PF and (c) 0.8 lead PF. 8. Derive the equation of Induced EMF in a Alternator. (Examples: 37.5 through 37.8 & Tutorial 37.1) 9. Armature reaction at Unity PF, zero lag and Zero lead PF. 10. Synchronous reactance:(37.17 p.1425); Draw the vector diagram of a loaded Alternator at different PF. 11. What is voltage regulation? Define it and mention the names of 3 methods used to determine the voltage regulation. 12. Briefly describe (i) Synchronous impedance Method, (ii) Ampere Turn Or MMF method & (iii) ZPF or Potier Method to determine the Voltage regulation of a Alternator. (Example 37.17,37.18, 37.19 37.20). Tutorial 37.2 13. Example 37.30 & 37.31 14. Operation & Vector Diagram of a Salient Pole Synchronous Machine. Learn the significance of the formula; Load Angle S, Power factor angle , internal power factor angle ; Learn also related Vector diagram. tan V sin 0+la Xq V cos 0+la Ra tan 8 = = la-Xq.cos V±laXq sin o' Example 37.39, 15. 37.40 and 37.41. 16. Describe the method of synchronizing Alternators. What is two bright one dark method. 17. Define Synchronizing Current, Power and Torque. Example 37.44, 37.45 18. (37.39- Effect of Unequal voltage, Distribution of load Example 37.51 & 37.52
Transcribed Image Text:EM2 Question Bank mid 1. Define Pitch Factor /Distribution Factor and present the formula to calculate. 2. Draw the double layer winding layout for a 24 slot stator and 4 pole alternator 3. An alternator having 10-poles, 3-phase, and 60 Hz has 8 conductors per slot in single layer arrangement with 4 slots/pole/phase. The coil span of the alternator is 1 to 8. The flux per pole has fundamental component of 0.03 Wb. Determine the total e.m.f induced per phase. 4. (i) Calculate the coil factor Kc given two sides of a coil are 165° apart. (ii). A 4-pole alternator has 60 slots. Calculate the distribution factor kd. 5. Find the no load phase and line voltage of a star connected, 4-pole alternator having flux per pole of 0.11 Wb sinusoidally distributed. 6 slots/pole/phase, 4 conductors/slot, double layer winding with a coil span of 150°. 6. With proper sketches, describe the armature reaction for a alternator when loaded with (a). unity PF (b) PF 0 lag and (c) PF O lead. 7. Determine the Voltage regulation of a 20 KVA 230 V, 1-4 alternator having Ra=0.01 0 and Xs= 0.1 for (a) unity PF (b) 0.75 lag PF and (c) 0.8 lead PF. 8. Derive the equation of Induced EMF in a Alternator. (Examples: 37.5 through 37.8 & Tutorial 37.1) 9. Armature reaction at Unity PF, zero lag and Zero lead PF. 10. Synchronous reactance:(37.17 p.1425); Draw the vector diagram of a loaded Alternator at different PF. 11. What is voltage regulation? Define it and mention the names of 3 methods used to determine the voltage regulation. 12. Briefly describe (i) Synchronous impedance Method, (ii) Ampere Turn Or MMF method & (iii) ZPF or Potier Method to determine the Voltage regulation of a Alternator. (Example 37.17,37.18, 37.19 37.20). Tutorial 37.2 13. Example 37.30 & 37.31 14. Operation & Vector Diagram of a Salient Pole Synchronous Machine. Learn the significance of the formula; Load Angle S, Power factor angle , internal power factor angle ; Learn also related Vector diagram. tan V sin 0+la Xq V cos 0+la Ra tan 8 = = la-Xq.cos V±laXq sin o' Example 37.39, 15. 37.40 and 37.41. 16. Describe the method of synchronizing Alternators. What is two bright one dark method. 17. Define Synchronizing Current, Power and Torque. Example 37.44, 37.45 18. (37.39- Effect of Unequal voltage, Distribution of load Example 37.51 & 37.52
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