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Heat Engines & Second Law of Thermodynamics Video Lecture | Physics Class 11 - NEET
FAQs on Heat Engines & Second Law of Thermodynamics Video Lecture - Physics Class 11 - NEET
| 1. What is a heat engine? |  |
Ans. A heat engine is a device that converts heat energy into mechanical work. It operates in a cyclic manner by taking in heat from a high-temperature source, performing work, and then releasing the remaining heat to a low-temperature sink.
| 2. How does a heat engine work? | |
Ans. A heat engine works based on the principles of the Second Law of Thermodynamics. It follows a cycle consisting of four processes: intake of heat at a high temperature, expansion of a working substance, exhaust of heat at a low temperature, and compression of the working substance. This cycle allows the engine to convert heat into mechanical work.
| 3. What is the Second Law of Thermodynamics? | |
Ans. The Second Law of Thermodynamics states that heat cannot spontaneously flow from a colder body to a hotter body. It also establishes the concept of entropy, which tends to increase in isolated systems. This law places limitations on the efficiency of heat engines and the direction of heat flow.
| 4. What is the efficiency of a heat engine? | |
Ans. The efficiency of a heat engine is defined as the ratio of the useful work output to the heat input. It is represented by the equation: Efficiency = (Useful work output / Heat input). Due to the Second Law of Thermodynamics, no heat engine can have an efficiency of 100%, meaning that some of the heat input will always be wasted.
| 5. Can a heat engine violate the Second Law of Thermodynamics? | |
Ans. No, a heat engine cannot violate the Second Law of Thermodynamics. The Second Law states that heat naturally flows from a higher temperature to a lower temperature, and it is impossible to extract all the heat and convert it into useful work. The efficiency of a heat engine is limited by this law, ensuring that some heat is always lost in the process.
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