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| Q.25 | Which of the following statements holds true, according to Kelvin Planck’s statement? | |
| Ans | 1. A heat engine must exchange heat from a single heat reservoir. | |
| 2. It restricts the engine to have mechanical efficiency lesser than unity. | ||
| 3. Perpetual motion machine of the 2nd kind is impossible. | ||
| 4. Some amount of heat taken from a source must be rejected to a higher temperature sink. |
Correct Ans Provided: 3
