# Assignment 2 (Thermodynamics)

10 Questions - Developed by: Gustav Söderkvist - Developed on: - 1.680 taken

• 1
An ideal gas goes from 10 atm and 50°C to 1 atm and 100°C by two paths. Path A is reversible, it is a constant volume step followed by a constant pressure step. Path B is irreversible, and is a constant pressure step followed by a constant volume step. Which path has the larger change in internal energy of the gas?
• 2
An inventor claims that she/he can convert 1000 J of heat into 1000 J of work. Does this violate the second law of thermodynamics?
• 3
An ideal gas is compressed adiabatically and irreversibly. The final temperature of this process relative to that for an adiabatic reversible process to the same final pressure is ____________.
• 4
Air is contained in a sealed tank of fixed volume. The air in the tank is initially at 20°C and 1 atm. It is then heated to 250°C. The internal energy of the air in the container ___________. Assume the air to be an ideal gas.
• 5
How can the efficiency of a refrigerator be increased?
• 6
How can we increase the efficiency of an automobile engine (Otto Engine)?
• 7
We got two different heat engines; one operates reversably and the other irreversibly. Which one has higher efficiency?
• 8
An ideal gas is at 27°C. It gets heated up at constant pressure and as a result its volume gets doubled. What is the approximate final temperature of the gas?
• 9
In an Isothermal path, which variables do not change during the path?
• 10
A gas goes through 2 different paths (isothermal and/or Adiabatic) to decrease the pressure from P1 to P2 as shown in the figure. Among the two paths shown in this figure, which one is Adiabatic?