According to entropy principle, the entropy of an isolated system can never decrease and remains constant only when the process is reversible.

Related MCQs

• The entropy of an isolated system can never          
• Entropy may decrease locally at some region within the isolated system. How can this statement be justified?
• 1.6 Kg of air is expanded at constant pressure from 100°C to 0°C resulting in entropy change of - 2.0 J/K 3.2 Kg of air is cooled at constant volume from 100°C to 0°C with a change in entropy of -3.0 J/K. The ratio Cp/ Cv is
• The entropy increase due to internal irreversibility is also called entropy production or entropy generation.
• For any reversible process, the change in entropy of the system & surroundings is
• For a reversible adiabatic process, the change in entropy is
• One reversible heat engine operates between 1600 K & T₂ K & another reversible heat engine operates between T₂ K & 400 K. If both the engines have the temperature T₂ must be equal to
• In a reversible cycle, the entropy of the system
• According to Carnot’s theorem, all heat engines operating between a given constant temperature source and sink, none has a higher efficiency than a reversible engine.
• If a system undergoes a reversible isothermal process without transfer of heat, the temperature at which this process takes place is called