Homework Answers
Answer is Option B .
The turbine exit temperature will be more than if the turbine is reversible.
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QUESTION 8 An actual turbine undergoes an adiabatic process generating entropy due to irreversibilities. The generated...
Provide an explanation for upvote thank you 2. An actual turbine undergoes an adiabatic process generating...
Provide an explanation for upvote thank you 2. An actual turbine undergoes an adiabatic process generating entropy due to irreversibilities. The generated entropy a) causes the turbine’s exit temperature to be lower than if the turbine were reversible. b) causes the turbine’s exit temperature to be higher than if the turbine were reversible. c) causes the turbine’s exit pressure to be lower than if the turbine were reversible. d) causes the turbine’s exit pressure to be higher than if the...
Provide an explanation as well for the following questions. 1 Both energy and entropy can be...
Provide an explanation as well for the following questions. 1 Both energy and entropy can be transferred between a system and surroundings by heat, work, and mass flow True or False 2. An actual turbine undergoes an adiabatic process generating entropy due to irreversibilities. The generated entropy a) causes the turbine’s exit temperature to be lower than if the turbine were reversible. b) causes the turbine’s exit temperature to be higher than if the turbine were reversible. c) causes the...
Which statement can be attributed to the 2nd Law of Thermodynamics? a For any real process,...
Which statement can be attributed to the 2nd Law of Thermodynamics? a For any real process, energy is conserved. b For any real process, entropy is conserved. c Energy flow has a direction. d Energy has a magnitude. Entropy change across a pump used in a certain practical application was found out to have a negative value. Which of the below statement is true? a The entropy generation across the pump is negative. b There is heat loss from the...
Problem 4 – Entropy transfer in a control volume (18 pts) An adiabatic reversible steam turbine...
Problem 4 – Entropy transfer in a control volume (18 pts) An
adiabatic reversible steam turbine steadily processes 2 kg/s of
steam at 5 MPa and 450°C, which is exhausted at 100 kPa and 100°C.
The turbine exhibits an isentropic efficiency of 0.85. a) Draw a
schematic representation of the system with all the energy
interactions involved. (2pts) b) Determine the h (kJ/kg) and s
(kJ/kg-K) at the inlet. (2 pts) c) Determine the actual h (kJ/kg)
and s (kJ/kg-K)...
Air initially at 120 psia and 500*F is expanded by an adiabatic turbine to 15 psia...
Air initially at 120 psia and 500*F is expanded by an adiabatic turbine to 15 psia and 200* F. Assuming air can be treated as an ideal gas and has variable specific heat. a) Determine the specific work output of the actual turbine (Btu/lbm). b) Determine the amount of specific entropy generation during the irreversible process (Btu/lbm R). c) Determine the isentropic efficiency of this turbine (%). d) Suppose the turbine now operates as an ideal compressor (reversible and adiabatic)...
3. Question 3: Entropy change in a diabatic steam turbine (20) Steam enters a reversible, adiabatic...
3. Question 3: Entropy change in a diabatic steam turbine (20) Steam enters a reversible, adiabatic turbine at 4 MPa and 520°C with a velocity of 60 m/s. The steam exhausts from the turbine at a pressure of 80 kPa with a velocity of 140 m/s. Determine the work output of the turbine per unit mass of steam flowing through the turbine. Steam Pi = 4 MPa Ti = 520°C Vi = 60 m/s Reversible, adiabatic turbine w System boundary...
5. (15) A closed system undergoes a process where heat transfer is allowed along the system...
5. (15) A closed system undergoes a process where heat transfer is allowed along the system boundary at constant temperature. For each case below, determine whether the change in entropy of the system is positive, negative, zero, or indeterminate. Explain your answer. a. Internally reversible process with heat transfer from the system to the surroundings b. Internally reversible process with heat transfer to the system from the surroundings; Internally reversible and adiabatic process; c. d. Internal irreversibilities present with heat...
Please answer all questions, I will upvote thanks. QUESTION 1 Which of the following statements about...
Please answer all questions, I will upvote thanks.
QUESTION 1 Which of the following statements about entropy is false? Entropy is a measure of molecular disorder. Entropy is a property and process path independent. Entropy is always generated during a process, including in a Carnot cycle. Entropy can decrease during a process. QUESTION 2 Which of the following statements about a reversible process is false? Reversible process is an idealized process that has no irreversibility involved. Work-consuming device consumes the...
Steam with the mass flow rate of 0.75 kg/s enters an adiabatic turbine steadily at 19 MPa, 600°C and 150 m/s
Steam with the mass flow rate of 0.75 kg/s enters an adiabatic turbine steadily at 19 MPa, 600°C and 150 m/s, and leaves at 150 kPa and 350 m/s. The isentropic efficiency of the turbine is 85%. Neglect potential energy. (I) Determine the exit temperature of the steam, and its quality (if saturated mixture) (ii) Calculate the actual power output of the turbine, in kW (iii) Illustrate a T-s diagram with respect to saturation lines for the isentropic process by clearly indicating all pressure, temperature,...
15-43.) Air undergoes an internally reversible adiabatic process from 200 kPa, 50°C to a final pressure...
15-43.) Air undergoes an internally reversible adiabatic process from 200 kPa, 50°C to a final pressure of 2.5 MPa. Assuming ideal-gas behavior with constant spe- cific heats, calculate the temperature and the specific volume at the final state.
Problem 4 – Entropy transfer in a control volume (18 pts) An
adiabatic reversible steam turbine steadily processes 2 kg/s of
steam at 5 MPa and 450°C, which is exhausted at 100 kPa and 100°C.
The turbine exhibits an isentropic efficiency of 0.85. a) Draw a
schematic representation of the system with all the energy
interactions involved. (2pts) b) Determine the h (kJ/kg) and s
(kJ/kg-K) at the inlet. (2 pts) c) Determine the actual h (kJ/kg)
and s (kJ/kg-K)...
3. Question 3: Entropy change in a diabatic steam turbine (20) Steam enters a reversible, adiabatic turbine at 4 MPa and 520°C with a velocity of 60 m/s. The steam exhausts from the turbine at a pressure of 80 kPa with a velocity of 140 m/s. Determine the work output of the turbine per unit mass of steam flowing through the turbine. Steam Pi = 4 MPa Ti = 520°C Vi = 60 m/s Reversible, adiabatic turbine w System boundary...
5. (15) A closed system undergoes a process where heat transfer is allowed along the system boundary at constant temperature. For each case below, determine whether the change in entropy of the system is positive, negative, zero, or indeterminate. Explain your answer. a. Internally reversible process with heat transfer from the system to the surroundings b. Internally reversible process with heat transfer to the system from the surroundings; Internally reversible and adiabatic process; c. d. Internal irreversibilities present with heat...
Please answer all questions, I will upvote thanks.
QUESTION 1 Which of the following statements about entropy is false? Entropy is a measure of molecular disorder. Entropy is a property and process path independent. Entropy is always generated during a process, including in a Carnot cycle. Entropy can decrease during a process. QUESTION 2 Which of the following statements about a reversible process is false? Reversible process is an idealized process that has no irreversibility involved. Work-consuming device consumes the...
15-43.) Air undergoes an internally reversible adiabatic process from 200 kPa, 50°C to a final pressure of 2.5 MPa. Assuming ideal-gas behavior with constant spe- cific heats, calculate the temperature and the specific volume at the final state.
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