d. none of the above. 83. The cycle expansion work output in kJ/kg is a. 267.2 b. 814.8 c. 1081.1 d. none of the above. 84. The thermal energy output in k.J/kg is a. 450.2 b. 619.1 e. 814.8 d. none of the above. 85. The thermal efficiency of the cycle is a. 33% b. 42% e. 58% d. none of the above. Q +

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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answer 83-85

Thermodynamic Keys Open with ▼
Questions 81-85 are based on the stated information below. The air
temperature in a piston-cylinder at the beginning of an adiabatic compression process of
ideal air standard cycle with a compression ratio of 18 is 300-K, the pressure is 0.1 MPa.
Heat addition occurs next during a constant pressure process that starts with the piston
top dead center of 1800-K. The next process in the cycle is an adiabatic expansion which
followed by a constant volume cooling process to complete the cycle.
State
P{MPa}
T{K}
uk.J/kg)
h/k/kg)
1.
0.10
300.0
214.07
300.1
P.
930.2
2.
5.39
898.3
672.4
2.
3.
3.
5.39
1800.0
1487.2
2003.2
4.
0.30
887.7
664.3
919.2
81. The compression work input in k.J/kg is
a. 266.3
b. 458.3
c. 814.8
d. none of the above.
82. The thermal energy input in kJ/kg is
a. 630.1
b. 824.8
c. 1073.0
d. none of the above.
83. The cycle expansion work output in kJ/kg is
a. 267.2
b. 814.8
c. 1081.1
d. none of the above.
84. The thermal energy output in kJ/kg is
a. 450.2
b. 619.1
e. 814.8
d. none of the above.
85. The thermal efficiency of the cycle is
a. 33%
b. 42%
c. 58%
d. none of the above.
Q +
Transcribed Image Text:Thermodynamic Keys Open with ▼ Questions 81-85 are based on the stated information below. The air temperature in a piston-cylinder at the beginning of an adiabatic compression process of ideal air standard cycle with a compression ratio of 18 is 300-K, the pressure is 0.1 MPa. Heat addition occurs next during a constant pressure process that starts with the piston top dead center of 1800-K. The next process in the cycle is an adiabatic expansion which followed by a constant volume cooling process to complete the cycle. State P{MPa} T{K} uk.J/kg) h/k/kg) 1. 0.10 300.0 214.07 300.1 P. 930.2 2. 5.39 898.3 672.4 2. 3. 3. 5.39 1800.0 1487.2 2003.2 4. 0.30 887.7 664.3 919.2 81. The compression work input in k.J/kg is a. 266.3 b. 458.3 c. 814.8 d. none of the above. 82. The thermal energy input in kJ/kg is a. 630.1 b. 824.8 c. 1073.0 d. none of the above. 83. The cycle expansion work output in kJ/kg is a. 267.2 b. 814.8 c. 1081.1 d. none of the above. 84. The thermal energy output in kJ/kg is a. 450.2 b. 619.1 e. 814.8 d. none of the above. 85. The thermal efficiency of the cycle is a. 33% b. 42% c. 58% d. none of the above. Q +
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