Q1) One kg of air at a pressure of (1.5 bar ) is cooled at a constant volume to a pressure ( 1 bar ). It is then compressed adiabatically until it attains its initial temperature , when the pressure is found to be ( 5 bar ) . a) Draw the processes on (P-V ) diagram . b) State the type of expansion necessary to bring the air back to its Original pressure . c) If the initial temperature of the air is ( 190 °C ), determine the work done and heat transferred during the processes . [ Take, Cp = 1.0 kJ /kg .ºK , C = 0. 72 kJ / kg .ºK]

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Q1) One kg of air at a pressure of (1.5 bar ) is cooled at a constant volume
to a pressure ( 1 bar ) . It is then compressed adiabatically until it attains
its initial temperature , when the pressure is found to be ( 5 bar ).
a) Draw the processes on (P-V ) diagram.
b) State the type of expansion necessary to bring the air back to its
Original pressure .
c) If the initial temperature of the air is ( 190 °C ), determine the work
done and heat transferred during the processes.
[ Take, Cp = 1.0 kJ /kg ."K , Cy = 0. 72 kJ / kg ."K]
Transcribed Image Text:Q1) One kg of air at a pressure of (1.5 bar ) is cooled at a constant volume to a pressure ( 1 bar ) . It is then compressed adiabatically until it attains its initial temperature , when the pressure is found to be ( 5 bar ). a) Draw the processes on (P-V ) diagram. b) State the type of expansion necessary to bring the air back to its Original pressure . c) If the initial temperature of the air is ( 190 °C ), determine the work done and heat transferred during the processes. [ Take, Cp = 1.0 kJ /kg ."K , Cy = 0. 72 kJ / kg ."K]
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