1. Tardigrade
  2. Question
  3. Physics
  4. A Carnot's engine is made to work between 200° C and 0° C first and then between 0° C and -200° C. The ratio of efficiencies of the engine is the two cases is

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. A Carnot's engine is made to work between $200^\circ \,C$ and $0^\circ \,C$ first and then between $0^\circ \,C$ and $-200^\circ \,C$. The ratio of efficiencies of the engine is the two cases is

KCETKCET 2002Thermodynamics

Solution:

$\eta=1-\frac{T_2}{T_1}$
$\therefore \,\eta_1=1-\frac{273}{473}=\frac{200}{473}$
$\eta_1=1-\frac{73}{273}=\frac{200}{273}$
$\therefore \,\eta_1/\eta_2=\frac{273}{473}=\frac{1}{1.73}$