MAE 201 Final Exam Review NCSU Questions With Verified Answers || 100% pass

MAE 201 Final Exam Review NCSU Questions With Verified Answers || 100% pass .T/F: A reversible process returns the working fluid to its initial state. - Answer-False .T/F: Entropy generation is a property. - Answer-False .T/F: An isentropic process is an ideal process with no heat transfer. - Answer-True .T/F: The purpose of a refrigerator is to remove heat from a high-temperature area. - Answer-False .T/F: The second law of thermodynamics states that all real processes must occur in the direction that generates entropy. - Answer-True .What classifies a reversible process? - Answer-Realistically impossible, must have zero entropy increase/generation. Typically the system must be in equilibrium with its surroundings. .What makes something a property? - Answer-Can be either intensive or extensive. Property is something such as mass, temperature, volume, or pressure. .What makes something an "ideal" process? - Answer-a process whose direction can be "reversed" by inducing infinitesimal changes to some property of the system via its surroundings, while not increasing entropy .What is the second law of thermodynamics? - Answer-the total entropy of an isolated system can only increase over time. It can remain constant in ideal cases where the system is in a steady state (equilibrium) or undergoing a reversible process. The increase in entropy accounts for the irreversibility of natural processes, and the asymmetry between future and past. .What happens when air is throttled? (choose all that apply) a) Temp held constant b) Pressure constant c) Enthalphy constant d) Mass constant - Answer-Answers include: c) enthalphy remains constant also work done is 0 a) temperature held constant