Question

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

Check all that apply.
A. Decrease the hot reservoir temperature TH while keeping the cool reservoir temperature TC constant.
B. Increase the difference TH−TC.
C. Decrease the ratio TC/TH.
D. Increase TH while keeping TC constant. Increase TC while keeping TH constant. Decrease TC while keeping TH constant.

Answer 1

option (c)

Step-by-step explanation:

The efficiency of the engine is given by

`\eta =1-(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

Step-by-step explanation:

Thermodynamic efficiency is given by

`\eta =1-(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
`(T_C)/(T_H)` ratio