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. |
A) \[25\,\Omega \]
B) \[30\,\Omega \]
C) \[35\,\Omega \]
D) \[15\,\Omega \]
Correct Answer: D
Solution :
(d) \[15\,\Omega \] Resistance of the two wire lines carrying power \[=0.5\,\Omega /km\] Total resistance \[=(15+15)0.5=15\,\Omega \].You need to login to perform this action.
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