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Direction: Q.31 to Q.35

Step-down transformers are used to decrease or step-down voltages. These are used when voltages need to be lowered for use in homes and factories.

A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is \[0.5\text{ }\Omega \] per km. The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.

Based on the above information, answer the following questions.

The value of total resistance of the wire is:

A) \[25\,\Omega \]              

B) \[30\,\Omega \]

C) \[35\,\Omega \]              

D) \[15\,\Omega \]