Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 8.15, Problem 23AAP
Consider the binary eutectic copper–silver phase diagram in Figure P8.23. Make phase analyses of an 88 wt% Ag–12 wt% Cu alloy at the temperatures (a) 1000°C, (b) 800°C, (c) 780°C + ΔT, and (d) 780°C − ΔT. In the phase analyses, include:
- i. The phases present
- ii. The chemical compositions of the phases
- iii. The amounts of each phase
- iv. Sketch the microstructure by using 2-cm-diameter circular fields.
Figure P8.23
The copper–silver phase diagram.
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Assignment 10, Question 1, Problem Book #189
Problem Statement
An ideal Brayton cycle operates with no reheat, intercooling, or regeneration. The com-
pressor inlet conditions are 30°C and 1 bar. The compression ratio is 11. The turbine inlet
temperature is 1,300 K. Determine the turbine exit temperature, the thermal efficiency, and
the back work ratio. Use an air standard analysis.
Answer Table
Correct
Stage
Description
Your Answer
Answer
*
1
Compressor inlet enthalpy (kJ/kg)
Due Date
Grade
(%)
Weight Attempt Action/Message
Part
Type
1
2
1 Compressor inlet relative pressure
1 Compressor exit relative pressure
1 Compressor exit enthalpy (kJ/kg)
Compressor work (kJ/kg)
Turbine inlet enthalpy (kJ/kg)
Dec 5, 2024 11:59 pm
Dec 5, 2024 11:59 pm
Dec 5, 2024 11:59 pm 0.0
0.0
1
1/5
Submit Stage 1
0.0
1
1
Dec 5, 2024 11:59 pm
0.0
1
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Turbine inlet relative pressure
Dec 5, 2024 11:59 pm
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Combustion chamber heat addition (kJ/kg)
Dec…
Assignment 10, Question 4, Problem Book #202
Problem Statement
An ideal Brayton cycle with a two-stage compressor, a two-stage turbine, and a regenerator
operates with a mass flow rate of 25 kg/s. The regenerator cold inlet is at 490 K and its
effectiveness is 60%. Ambient conditions are 90 kPa and 20°C. The intercooler operates at
450 kPa and the reheater operates at 550 kPa. The temperature at the exit of the combustion
chamber is 1,400 K. Heat is removed in the intercooler at a rate of 2.5 MW and heat is added
in the reheater at a rate of 10 MW. Determine the thermal efficiency and the back work
ratio. Use a cold air standard analysis with cp = 1.005 kJ/(kg K) and k = 1.4.
.
Answer Table
Stage
Description
Your Answer
Correct
Answer
Due Date
Grade
(%)
1
Thermal efficiency (%)
Dec 5, 2024 11:59 pm
0.0
1
Weight Attempt Action/Message
1/5
Part
Type
Submit
1
Back work ratio (%)
Dec 5, 2024 11:59 pm
0.0
1
* Correct answers will only show after due date has passed.
Chapter 8 Solutions
Foundations of Materials Science and Engineering
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