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- Question
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
- Correct Answer
- 54 kJ
- 1. The entropy of water at 0°C is assumed to be
Options- A. 1
- B. 0
- C. -1
- D. 10 Discuss
- 2. One kg of carbon produces __________ kg of carbon dioxide.
Options- A. 3/7
- B. 7/3
- C. 11/3
- D. 3/11 Discuss
- 3. 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
- 4. 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 Discuss
- 5. The blast furnace gas is a by-product in the production of pig iron in the blast furnace.
Options- A. Yes
- B. No Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Thermodynamics problems
Search Results
Correct Answer: 0
Correct Answer: 11/3
Correct Answer: equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules
Correct Answer: heat rejection is lower
Correct Answer: Yes
Correct Answer: No
Correct Answer: mcv(T2 - T1)
Correct Answer: all of these
Correct Answer: Zeroth law of thermodynamics
Correct Answer: 15 to 20
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