CUET · PHYSICS · PYQ PAPER 2023
A thermal power plant produces electric power of 1000 kW at 10000 V, which is to be transmitted 20 km away from the power plant. The transmission line has resistance of 0.5 ohm per kilometre, the percentage power dissipation during transmission is :
- A 10%
- B 5%
- C 20%
- D 40%
Answer & Solution
Correct Answer
(A) 10%
Step-by-step Solution
Detailed explanation
Total resistance: \(R = 0.5 \text{ \(\Omega\)/km} \times 20 \text{ km} = 10 \text{ \(\Omega\)} \) Current: \(I = \frac{1000 \times 10^3 \text{ W}}{10000 \text{ V}} = 100 \text{ A} \) Power loss: \(P_{loss} = (100 \text{ A})^2 \times 10 \text{ \(\Omega\)} = 100000 \text{ W} \)…
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