27. Gas initially at a pressure of 101.325 kPa and temperature of 60 °C undergoes the following cycle. 1-2 Adiabatic compression through compression ratio of 4.5:1. 2-3 Heating at constant volume through a pressure ratio of 1.35:1. 3-4 Constant pressure expansion to initial pressure. 4-1 Constant pressure cooling to initial volume.

27. Gas initially at a pressure of 101.325 kPa and temperature of 60 °C undergoes the following cycle. 1-2 Adiabatic compression through compression ratio of 4.5:1. 2-3 Heating at constant volume through a pressure ratio of 1.35:1. 3-4 Constant pressure expansion to initial pressure. 4-1 Constant pressure cooling to initial volume.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

27. Gas initially at a pressure of 101.325 kPa and temperature of 60 °C undergoes the following cycle.
1-2 Adiabatic compression through compression ratio of 4.5:1.
2-3 Heating at constant volume through a pressure ratio of 1.35:1.
3-4 Constant pressure expansion to initial pressure.
4-1 Constant pressure cooling to initial volume.
If Cp = 1 kJ/kg-K and Cv = 0.678 kJ/kg-K for the gas, determine the thermal efficiency of the
cycle. Answer: A
A. 41.41%
B. 39.39%
C. 43.43%
D. 45.45%

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