1. Uses of the second law of thermodynamics include defining the Kelvin scale an

Question

1. Uses of the second law of thermodynamics include defining the Kelvin scale and predicting the direction of processes a. TRUE/FALSE When placed outside and exposed to the atmosphere, an ice cube melts, forming a thin film of liquid on the ground. Overnight, the liquid freezes, returning to its initial temperature of the ice cube. The water making up the cube undergoes a reversible process 2. a. TRUE/FALSE A throttling process is isobaric 3. a. TRUE/FALSE The change in entropy of a closed system is the same for every process between two specified end states. 4. a. TRUE/FALSE The coefficient of performance of a reversible refrigeration cycle is always less than the coefficient of performance of an irreversible refrigeration cycle when each operates between the same two thermal reservoirs 5. a. TRUE/FALSE A cell phone initially has a fully charged battery. After a period of cell phone use, the battery is recharged to its initial state. The quantity of electricity to recharge the battery is greater than the quantity required to operate the phone 6. a. TRUE/FALSE For a closed system, entropy may be produced within the system, may be transferred across it boundary, or may remain constant throughout the system 7. a. TRUE/FALSE Internally reversible processes do not actually occur but serve as hypothetical limiting cases as internal irreversibility are reduced further and further 8. a. TRUE/FALSE When an isolated system undergoes a process, the values of its energy and entropy can only increase or remain the same 9. a. TRUE/FALSE 10. A reversible heat pump cycle operates between cold and hot thermal reservoirs at 300°C and 500°C, respectively. The Coefficient of performance is close to 2.87 a. TRUE/FALSE

Explanation / Answer

1. True

2. False, latent heat changes. Surroundings cannot restore to initial states.

3. False, it is isenthaplic.

4. True, since the entopy is a property.

5. False. Reversible devices has higher performance.

Please post the other questions seperately.

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