Second Law of Thermo

Question 1

Define cyclic process

Answer 1

The system returns to original state

Question 2

Closed system cyclic process

Answer 2

delta U=0

Question 3

Steady flow system cyclic process

Answer 3

delta H=0

Question 4

Describe the carnot cycle for a perfect gas (clockwise= heat engine)

Answer 4

steps 1-2 = isothermal
steps 2-3 = adiabatic
steps 3-4= isothermal
steps 4-1 = adiabatic

(refrigerator =anticlockwise)

Question 5

Define the carnot principles

Answer 5

1. No heat engine/refrigerator can be more efficient that a reversible heat engine/refrigerator operating between the same two reservoirs(temperatures).
2. All reversible (i.e., Carnot) heat engines operating between the same two reservoirs (temperatures) have the same efficiency.