Thermodynamics problems
- 1. The entropy of water at 0°C is assumed to be
Options- A. 1
- B. 0
- C. -1
- D. 10 Discuss
Correct Answer: 0
- 2. A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
Options- A. 30 kJ
- B. 54 kJ
- C. 84 kJ
- D. 114 kJ Discuss
Correct Answer: 54 kJ
- 3. The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the temperature remains constant. This statement is known as Charles' law.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 4. The heat supplied to the gaS at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 - T1 = Rise in temperature, and R = Gas constant)
Options- A. mR(T2 - T1)
- B. mcv(T2 - T1)
- C. mcp(T2 - T1)
- D. mcp(T2 + T1) Discuss
Correct Answer: mcv(T2 - T1)
- 5. In an isothermal process,
Options- A. there is no change in temperature
- B. there is no change in enthalpy
- C. there is no change in internal energy
- D. all of these Discuss
Correct Answer: all of these
- 6. The measurement of a thermodynamic property known as temperature is based on
Options- A. Zeroth law of thermodynamics
- B. First law of thermodynamics
- C. Second law of thermodynamics
- D. none of these Discuss
Correct Answer: Zeroth law of thermodynamics
- 7. The compression ratio for Diesel engines is
Options- A. 3 to 6
- B. 5 to 8
- C. 15 to 20
- D. 20 to 30 Discuss
Correct Answer: 15 to 20
- 8. The thermodynamic property of a system is said to be an intensive property whose value for the entire system __________ the sum of their value for the individual parts of the system.
Options- A. is equal to
- B. is not equal to Discuss
Correct Answer: is not equal to
- 9. Liquid fuels consist of hydrocarbons.
Options- A. True
- B. False Discuss
Correct Answer: True
- 10. The free expansion process is __________ non-flow process.
Options- A. reversible
- B. irreversible Discuss
Correct Answer: irreversible
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