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

(a) sketch a labelled diagram of the basic construction; (4)

(b) describe the principle of operation; (4)

(c) explain why it is rated in kVA; (3)

(d) explain why it may overheat if supplied below its rated frequency; (3)

(e) state how operation at a reduced frequency may be compensated to avoid Overheating. (2)