Polytropic Processes

Question 1

What is a Polytropic Process

Answer 1

A polytropic process is a thermodynamic process that obeys the relation
pV^n =constant

Question 2

What are the Following Processes, and what are their polytropic indexes
Isobaric
Isochoric
Isothermal
Adiabatic

Answer 2

Isobaric - n=0 , constant pressure
isochoric n = infinite , constant volume process
isothermal n=1 , constant temperature
adiabatic process n = constant value not 1 or 0

Question 3

Calculate the Boundary Work for an Isothermal Process.

Answer 3

Question 4

What is an Adiabatic Process
What is the the Change in Entropy for an Adiabatic process

Answer 4

Process which heat doesn’t enter or exist the system
Change in Entropy = 0 , entropy stays constant

Question 5

Use a graph to describe the differences between an isothermal and adiabatic process

Answer 5

Isothermal
Constant Temperature Process
Very Slow Process

Adiabatic
No heat enters or leaves system
Very fast Process

Question 6

Calculate the Boundary Work for an Adiabatic Process

Answer 6

Question 7

Draw and Explain the Otto Cycle

Answer 7

1-2 Adiabatic Compression, No Heat Transferred
2-3 Constant Volume Addition, Spark Plug Ignites fuel
3-4 Adiabatic Expansion , No Heat Transferred, Expanding gas pushes piston
4-1 Constant Volume Rejection , Exhaust Value Opens and dispenses burnt gas

Question 8

Answer 8

Question 9

Answer 9

Question 10

Answer 10

Question 11

Answer 11