Which engine has the least efficiency?
Correct answer: B. Carnot engine
- A. Petrol engine
- B. Carnot engine
- C. Diesel engine
- D. Watt's steam engine
Explanation
The Carnot engine has the highest theoretical efficiency among heat engines operating between two temperature reservoirs. However, it is an idealized engine, and in practical terms, no engine can achieve Carnot efficiency. Therefore, it is considered to have the least efficiency practically.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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