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Q6. With reference to a single- phase power transformer with natural air cooling:

(a) Sketch labelled diagram of the basic construction; (3)

(b) Describe the principle of operation; (5)

(c) Explain why it is rated in kVA; (2)

(d) Explain why it may overheat if operated at reduced frequency; (3)

(e) State how operation at reduced frequency may be compensated to avoid overheating. (3)