THERMODYNAMICS QUALIFYING EXAM
QUESTION AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A INSTANT DOWNLOAD PDF
1. Which property of a system depends only on the state and not on the path?
A. Work
B. Heat
C. Internal energy
D. Power
Answer: C
Internal energy is a state function and depends only on the thermodynamic
state, not on the process path.
2. The first law of thermodynamics is a statement of conservation of:
A. Mass
B. Momentum
C. Energy
D. Entropy
Answer: C
The first law states that energy can neither be created nor destroyed, only
transformed.
3. Which process occurs at constant entropy?
A. Isothermal
, B. Isobaric
C. Isochoric
D. Isentropic
Answer: D
An isentropic process is defined by constant entropy.
4. For an ideal gas, internal energy is a function of:
A. Pressure only
B. Volume only
C. Pressure and volume
D. Temperature only
Answer: D
In an ideal gas, internal energy depends solely on temperature.
5. The SI unit of entropy is:
A. J
B. J/K
C. J/(kg·K)
D. W/K
Answer: C
Specific entropy is measured in joules per kilogram per kelvin.
6. A reversible process is one that:
A. Occurs rapidly
B. Has friction
C. Can be reversed without leaving changes in surroundings
D. Is always adiabatic
, Answer: C
Reversible processes leave no net changes in the system and surroundings.
7. The second law of thermodynamics introduces the concept of:
A. Energy
B. Work
C. Heat
D. Entropy
Answer: D
Entropy quantifies irreversibility and the direction of natural processes.
8. Which cycle is used in steam power plants?
A. Otto
B. Diesel
C. Brayton
D. Rankine
Answer: D
The Rankine cycle is the fundamental cycle for steam power plants.
9. Heat transfer due to molecular interaction is called:
A. Radiation
B. Convection
C. Conduction
D. Diffusion
Answer: C
Conduction occurs via molecular collisions and electron transport.
QUESTION AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A INSTANT DOWNLOAD PDF
1. Which property of a system depends only on the state and not on the path?
A. Work
B. Heat
C. Internal energy
D. Power
Answer: C
Internal energy is a state function and depends only on the thermodynamic
state, not on the process path.
2. The first law of thermodynamics is a statement of conservation of:
A. Mass
B. Momentum
C. Energy
D. Entropy
Answer: C
The first law states that energy can neither be created nor destroyed, only
transformed.
3. Which process occurs at constant entropy?
A. Isothermal
, B. Isobaric
C. Isochoric
D. Isentropic
Answer: D
An isentropic process is defined by constant entropy.
4. For an ideal gas, internal energy is a function of:
A. Pressure only
B. Volume only
C. Pressure and volume
D. Temperature only
Answer: D
In an ideal gas, internal energy depends solely on temperature.
5. The SI unit of entropy is:
A. J
B. J/K
C. J/(kg·K)
D. W/K
Answer: C
Specific entropy is measured in joules per kilogram per kelvin.
6. A reversible process is one that:
A. Occurs rapidly
B. Has friction
C. Can be reversed without leaving changes in surroundings
D. Is always adiabatic
, Answer: C
Reversible processes leave no net changes in the system and surroundings.
7. The second law of thermodynamics introduces the concept of:
A. Energy
B. Work
C. Heat
D. Entropy
Answer: D
Entropy quantifies irreversibility and the direction of natural processes.
8. Which cycle is used in steam power plants?
A. Otto
B. Diesel
C. Brayton
D. Rankine
Answer: D
The Rankine cycle is the fundamental cycle for steam power plants.
9. Heat transfer due to molecular interaction is called:
A. Radiation
B. Convection
C. Conduction
D. Diffusion
Answer: C
Conduction occurs via molecular collisions and electron transport.
