Saved Bookmarks
| 1. |
A Carnot heat engine has an efficiency of `10%`. If the same engine is worked backward to obtain a refrigerator, then find its coefficient of performance.A. 3B. 5C. 7D. 9 |
|
Answer» Correct Answer - D Efficiency of carnot engine is, `eta = 1 - (T_(2))/(T_(1))` `0.1 = 1 - (T_(2))/(T_(1))` `:. (T_(2))/(T_(1)) = 0.9` Coefficient of perfomance (COP) of a refrigerator `= (T_(2))/(T_(1) - T_(2)) = (0.9T_(1))/(T_(1) - 0.9T_(1)) = 9` `:. COP = 9` |
|