Thermodynamics problems
- 1. The entropy may be expressed as a function of
Options- A. pressure and temperature
- B. temperature and volume
- C. heat and work
- D. all of these Discuss
Correct Answer: pressure and temperature
- 2. Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules. This statement is called Avogadro's law.
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. The molecular mass of a substance is the number of times a molecule of that substance is heavier than the hydrogen atom.
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. Charles' law states that all perfect gases change in volume by __________ of its original volume at 0° C for every 1° C change in temperature, when pressure remains constant.
Options- A. 1/27th
- B. 1/93th
- C. 1/173th
- D. 1/273th Discuss
Correct Answer: 1/273th
- 5. For the same maximum pressure and temperature,
Options- A. Otto cycle is more efficient than Diesel cycle
- B. Diesel cycle is more efficient than Otto cycle
- C. Dual cycle is more efficient than Otto and Diesel cycles
- D. Dual cycle is less efficient than Otto and Diesel cycles Discuss
Correct Answer: Diesel cycle is more efficient than Otto cycle
- 6. For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order
Options- A. Dual cycle, Diesel cycle, Otto cycle
- B. Otto cycle, Diesel cycle, Dual cycle
- C. Dual cycle, Otto cycle, Diesel cycle
- D. Diesel cycle, Otto cycle, Dual cycle Discuss
Correct Answer: Dual cycle, Diesel cycle, Otto cycle
- 7. Diesel cycle consists of __________ processes.
Options- A. two constant volume and two isentropic
- B. two constant pressure and two isentropic
- C. two constant volume and two isothermal
- D. one constant pressure, one constant volume and two isentropic Discuss
Correct Answer: one constant pressure, one constant volume and two isentropic
- 8. It is __________ to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.
Options- A. possible
- B. impossible Discuss
Correct Answer: impossible
- 9. The entropy of the universe is continually on the increase.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 10. The behaviour of super-heated vapour is similar to that of
Options- A. perfect gas
- B. air
- C. steam
- D. ordinary gas Discuss
Correct Answer: perfect gas
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