Discussion
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- Question
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
Options- A. combustion is at constant volume
- B. expansion and compression are isentropic
- C. maximum temperature is higher
- D. heat rejection is lower
- Correct Answer
- heat rejection is lower
- 1. The blast furnace gas is a by-product in the production of pig iron in the blast furnace.
Options- A. Yes
- B. No Discuss
- 2. The efficiency of a dual combustion cycle __________ upon cut-off ratio.
Options- A. depends
- B. does not depend Discuss
- 3. The fuel mostly used in steam boilers is
Options- A. brown coal
- B. peat
- C. coking bituminous coal
- D. non-coking bituminous coal Discuss
- 4. The efficiency of Joule cycle is
Options- A. greater than Carnot cycle
- B. less than Carnot cycle
- C. equal to Carnot cycle
- D. none of these Discuss
- 5. The greater the pressure difference in throttling, the lesser is the irreversibility.
Options- A. Yes
- B. No Discuss
- 6. According to Avogadro's law
Options- A. the product of the gas constant and the molecular mass of an ideal gas is constant
- B. the sum of partial pressure of the mixture of two gases is sum of the two
- C. equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules
- D. all of the above Discuss
- 7. One kg of carbon produces __________ kg of carbon dioxide.
Options- A. 3/7
- B. 7/3
- C. 11/3
- D. 3/11 Discuss
- 8. The entropy of water at 0°C is assumed to be
Options- A. 1
- B. 0
- C. -1
- D. 10 Discuss
- 9. 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
- 10. 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
Thermodynamics problems
Search Results
Correct Answer: Yes
Correct Answer: depends
Correct Answer: non-coking bituminous coal
Correct Answer: less than Carnot cycle
Correct Answer: No
Correct Answer: equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules
Correct Answer: 11/3
Correct Answer: 0
Correct Answer: 54 kJ
Correct Answer: No
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