Hi @sahar78, thank you for participating in the Industrial Electrical Homework. We have assessed your Homework post , and the below captures our assessments.

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A. You have determined step up and step down by looking at the voltage across the two transformers. The name of the transformer can be found by looking at the primary and secondary turns. You are correct in finding out the turn ratio of the transformer.

B. You have identified the various parts with a picture of a power transformer and written the function of each part. You have done a very nice presentation.

C. The transformer you have shown in the picture is a step-down transformer. It works by converting high voltage to low voltage. Our homes have low-voltage electrical loads.

D. You find the transformer rating by calculating a power factor of 0.8 for a 5000 kW electrical load. You have to be careful not to use load-equivalent transformers. The transformer can be used at 80% load. I hope you understand.

E. You have given the company name of the transformer as Energypack. The name of the transformer will be a power transformer or step-up transformer. I hope you understand your mistake.

F. You have mistaken the HT and LT current of the transformer. You can calculate again with the calculator. If the current output of the transformer is wrong, it will face serious damage.

G. If the power factor is not ideal, the power companies charge a penalty. Your assumption about the power factor is correct.

H. You have written the difference between the two transformers correctly, and your true/false marking is correct.

Thank you for doing nice homework and reading Industrial Electrical Lessons. You made a mistake as finding the LT current of the transformer. Mistaking electricity for this increases the chance of an accident.