Question

: The maximum theoretical efficiency of a Carnot engine operating between reservoirs at the steam point and at room temperature is about A :

Answer 1

Answer:

The value is   $\eta = 0.2145$  or  21.45%

Explanation:

From the question we are told that

    The first reservoir is at steam point  $T_s = 100^o C = 100 + 273 = 373 \ K$  

    The  second reservoir is at room temperature $T_r = 20^o C = 293 \ K$

Generally the  maximum theoretical efficiency of a Carnot engine  is mathematically evaluated as

     $\eta = 1- \frac{T_r}{T_s}$

=>    $1 - \frac{ 293}{373}$

=>    $\eta = 0.2145$