ETO – ETO – Section 2 : 2019/AUG/06 – 2019/OCT/04 – 2019/DEC/05 – 2020/DEC/06 – 2025/JAN/06
Question
Q6. With Reference to 3-phase Transformers:
a) Discuss the essential and desirable conditions to be fulfil for operating two three-phase transformers in parallel. (5)
b) What are the advantages of transformer bank of three 1-phase transformers over a unit three phase transformer of the same kVA rating? (5)
c) In a 25 kW, 3300/233V, 1-phase transformer the iron and full load copper losses are 350 watts and 400 watts respectively. Calculate the efficiency at half load 0.8 P. F (6)
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