Transformers and Induction Machines Exam Prep
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Transformers and Induction Machines Exam Prep
Sample questions with model answers
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With neat circuit diagram, equations and waveform, Derive an expression for Emf induced in a single phase transformer.
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The EMF induced is given by E = 4.44 f φm N.
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Determine the regulation while supplying full load on 0.8 leading PF and the secondary terminal voltage on full load & 0.8 leading PF of transformer 200/125, 10 KVA, it has primary resistance is 0.6 ohms and reactance of 0.8 ohms. The secondary resistance is 0.07 ohms & reactance of 0.3 ohms.
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Regulation can be calculated using the formula: Regulation = (V_no_load - V_full_load) / V_full_load * 100.
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Explain the characteristics of ideal transformers. Briefly write a short note on losses in a single phase transformer.
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Ideal transformers have no losses, perfect coupling, and maintain the same frequency.
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A 100KVA transformer has its maximum efficiency of 0.98 at full load with UPF. During the day it is loaded as follows: For 12hours → 20KW at 0.5 PF lag, For 6hours → 45KW at 0.9 PF lag, For 6hours → 80KW at 0.8 PF lag. Determine its all-day efficiency.
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All-day efficiency can be calculated by considering the total energy output and input over the day.
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