Question

Which of the following changes will always increase the efficiency of a thermodynamic engine? Choose all correct statements.

Answer 1

Answer:

option (c)

Explanation:

The efficiency of the engine is given by

$\eta =1-\frac{T_{c}}{T_{H}}$

to increase the efficiency of the engine, the temperature of the cold reservoir should be decreased and thus the temperature of hot reservoir be increased.

So, decrease the ratio of Tc/TH.

option (C)

Answer 2

Answer:B,C,D

Explanation:

Thermodynamic  efficiency is given by

$\eta =1-\frac{T_C}{T-H}$

$\eta$ efficiency can be increased by Keeping $_c$ constant and increasing $T_H$

Keeping $T_H$ constant and decreasing $T_c$

by increasing $\Delta T=T_H-T_c$

by decreasing $\frac{T_C}{T_H}$ ratio