SATHEE: Thermodynamics Question 152

Thermodynamics Question 152

Question: An ideal heat engine exhausting heat at $77^{o} C$ is to have a 30% efficiency. It must take heat at

[BCECE 2004]

Options:

A) $127^{o} C$

B) $227^{o} C$

C) $327^{o} C$

D) $673^{o} C$

Show Answer

Answer:

Correct Answer: B

Solution:

$η = 1 - \frac{T_{2}}{T_{1}}$

Therefore $\frac{30}{100} = 1 - \frac{350}{T_{1}}$

Therefore $\frac{350}{T_{1}} = 1 - \frac{50}{100} = \frac{70}{100} = \frac{7}{10}$

Therefore $T_{1} = 500 K = 227^{\circ} C$

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Thermodynamics Question 152

Question: An ideal heat engine exhausting heat at 77oC is to have a 30% efficiency. It must take heat at

Options:

Answer:

Solution:

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Question: An ideal heat engine exhausting heat at $77^{o} C$ is to have a 30% efficiency. It must take heat at