Question

A carnot engine exhausting heat to sink at
27°c has an effeciency of 25%. It must be
taking heat from the source at which temperature?
1) 673°C
2) 327°C
3) 227°C
4) 127°C
​

Answer 1

327 is right answer the questions

Answer 2

Answer: ( D ) 127 degree celsius is the correct answer

Explanation:

aking the Sink Temperature(T2) = 27 degree celsius = 300 kelvin

Efficiency(eta) be 25% = .25

Source Temperature(T1) = ?

Efficiency= (T1 - T2) / T1

Efficiency= 1 -T2/T1

T2/T1 = 1 - Efficiency

T1 = T2/(1 - Efficiency)

T1= 300/(1-.25)

T1 = 400 kelvin = 127 degree celsius