Discussion
Home ‣ Mechanical Engineering ‣ Thermodynamics Comments
- Question
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
- Correct Answer
- pressure and temperature
- 1. The polytropic index (n) is given by
Options- A.
- B.
- C.
- D.
Discuss
- 2. Which of the following statement is correct?
Options- A. The increase in entropy is obtained from a given quantity of heat at a low temperature.
- B. The change in entropy may be regarded as a measure of the rate of the availability or unavailability of heat for transformation into work.
- C. The entropy represents the maximum amount of work obtainable per degree drop in temperature.
- D. all of the above Discuss
- 3. Briquetted coal is produced from the finely ground coal by moulding under pressure with or without a binding material.
Options- A. True
- B. False Discuss
- 4. Select the correct statement as per Charles' law
Options- A. p.v = constant, if T is kept constant
- B. v/T = constant, if p is kept constant
- C. p/T = constant, if v is kept constant
- D. T/p = constant, if v is kept constant Discuss
- 5. The unit of energy is S. I. units is
Options- A. Joule (J)
- B. Joule metre (Jm)
- C. Watt(W)
- D. Joule/metre (J/m) Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Thermodynamics problems
Search Results
Correct Answer:
Correct Answer: all of the above
Correct Answer: True
Correct Answer: v/T = constant, if p is kept constant
Correct Answer: Joule (J)
Correct Answer: True
Correct Answer: True
Correct Answer: 1/273th
Correct Answer: Diesel cycle is more efficient than Otto cycle
Correct Answer: Dual cycle, Diesel cycle, Otto cycle
Comments
There are no comments.More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.