2. Thermodynamics

Intro Thermodynamics — Quiz

Test your understanding of intro thermodynamics with 5 practice questions.

Practice Questions

Question 1

For a closed system undergoing a polytropic process described by $PV^n=\mathrm{constant}$, which expression gives the work done by the gas from state 1 to state 2?

Question 2

A steam nozzle has inlet enthalpy $h_1=2800\,\mathrm{kJ/kg}$ and outlet enthalpy $h_2=2600\,\mathrm{kJ/kg}$. Assuming negligible heat transfer and potential energy change, what is the ideal exit velocity $v$ of the steam?

Question 3

A heat engine operates with a thermal efficiency of 30% and absorbs $800\,\mathrm{kJ}$ of heat per cycle. How much heat $Q_{\text{out}}$ is rejected to the cold reservoir each cycle?

Question 4

A closed system receives $200\,\mathrm{kJ}$ of heat reversibly at a constant temperature of $300\,\mathrm{K}$. What is the system’s entropy change $\Delta S$?

Question 5

In the steady‐flow energy equation for an open system, which term represents the useful mechanical work output excluding the flow work?