Assessment 2 Emm3601 2022 Question 1 A 120 Kva 6000 400 V Y Y 3 Phase 50 Hz Transformer Has An Iron Loss Of 1600 W Th 1 (57.35 KiB) Viewed 29 times
Assessment 2 Emm3601 2022 Question 1 A 120 Kva 6000 400 V Y Y 3 Phase 50 Hz Transformer Has An Iron Loss Of 1600 W Th 2 (53.73 KiB) Viewed 29 times
ASSESSMENT 2 EMM3601_2022 Question 1 A 120 KVA, 6000/400 V Y/Y 3-phase, 50 Hz transformer has an iron loss of 1600 W. The maximum efficiency occurs at tull load. Determine the following: (a) The efficiency of the transformer at full-load and 0.8 power factor [8] (b) The maximum efficiency [6] (c) The efficiency at half-load and unity power factor [6] Question 2 A certain 250 kVA, 3300/400 V, 50 Hz, Dy connected transformer has an impedance of (1.2 +j3) 2. The transformer supplies a balanced load of lagging power factor of 0.8. 2.1 Determine the turns ratio [2] Determine the approximate per unit regulation [2] Determine the approximate full load secondary voltage [2] Determine the full-load copper loss [2] Determine the full load efficiency if the iron loss is 3 kW [2] Determine the load phase angle for maximum regulation [2] Determine the load phase angle for zero regulation [2] Determine the emf per turn if the flux is 0.039 wb [2] Determine the equivalent resistance referred to the secondary [4] 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9
Question 1 A 120 kVA, 6000/400 V YAY 3-phase, 50 Hz transformer has an iron loss of 1600 W. The maximum efficiency occurs at full load. Determine the following: (a) The efficiency of the transformer at full-load and 0.8 power factor [8] (b) The maximum efficiency [6] (c) The efficiency at half-load and unity power factor [6] Question 2 A certain 250 kVA, 3300/400 V, 50 Hz, Dy connected transformer has an impedance of (1.2 +j3) . The transformer supplies a balanced load of lagging power factor of 0.8. Determine the turns ratio [2] Determine the approximate per unit regulation Determine the approximate full load secondary voltage [2] Determine the full-load copper loss [2] Determine the full load efficiency if the iron loss is 3 kW [2] Determine the load phase angle for maximum regulation [2] Determine the load phase angle for zero regulation [2] Determine the emf per turn if the flux is 0.039 wb [2] Determine the equivalent resistance referred to the secondary [4] 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9
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