CHAPTER 1 THERMODYNAMICS 1. Enthalpy of an ideal gas is a function only of ___________. A. entropy B. internal energy C. temperature D. pressure Answer: C 2. Which of the following is the most efficient thermodynamic cycle? A. Brayton B. Otto C. Carnot D. Diesel Answer: C 3. What is the first law of thermodynamics? A. internal energy is due to molecular motions B. entropy of the universe is increased by irreversible processes C. energy can neither be crated nor destroyed D. heat energy cannot be completely transformed into work Answer: C 4. An ideal gas is compressed isothermally, what is the enthalpy change? A. always negative B. always positive C. zero D. undefined Answer: C 5. Name the process that has no heat transfer. A. isothermal B. isobaric C. Polytropic D. adiabatic Answer: D 6. An ideal gas is compressed in a cylinder so well insulated that there is essentially no heat transfer. The temperature of the gas A. decreases B. increases C. remain constant D. is zero Answer: B 7. What is the SI unit of pressure? A. 𝑘𝑔 𝑐𝑚2 B. 𝑑𝑦𝑛𝑒𝑠 𝑐𝑚2 C. Pascal D. Psi Answer: C 8. The equation 𝐶𝑝 = 𝐶𝑣 + R applies to which of the following? A. enthalpy B. ideal gas C. two phase state D. all pure substances Answer: B 9. In the flow process, neglecting kinetic and potential energies, the integral of Vdp represents what? A. heat transfer B. flow energy C. enthalpy change D. shaft work Answer: D 10. Mechanical energy of pressure transformed into energy of heat. A. kinetic energy B. enthalpy C. heat exchanger D. heat of compression Answer: B