Discussion
Home ‣ Mechanical Engineering ‣ Thermodynamics Comments
- Question
Workdone during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and ? = Ratio of specific heats)
Options- A.
- B.
- C.
- D. all of these
- Correct Answer
- all of these
- 1. An open system is one in which
Options- A. heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system
- B. mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system
- C. both the heat and work as well as mass of the working substance crosses the boundary of the system
- D. neither the heat and work nor the mass of the working substance crosses the boundary of the system Discuss
- 2. In an extensive property of a thermodynamic system
Options- A. extensive heat is transferred
- B. extensive work is done
- C. extensive energy is utilised
- D. none of these Discuss
- 3. The absolute zero pressure will be
Options- A. when molecular momentum of the system becomes zero
- B. at sea level
- C. at the temperature of - 273 K
- D. at the centre of the earth Discuss
- 4. One kg of hydrogen requires 8 kg of oxygen and produces
Options- A. 1 kg of water
- B. 7 kg of water
- C. 8 kg of water
- D. 9 kg of water Discuss
- 5. Select the wrong statement
Options- A. A Joule cycle consists of two constant volume and two isentropic processes.
- B. An Otto cycle consists of two constant volume and two isentropic processes.
- C. An Ericsson cycle consists of two constant pressure and two isothermal processes.
- D. all of the above Discuss
- 6. When the gas is cooled at constant pressure,
Options- A. its temperature increases but volume decreases
- B. its volume increases but temperature decreases
- C. both temperature and volume increases
- D. both temperature and volume decreases Discuss
- 7. The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)
Options- A. pv = mRT
- B. pv = RTm
- C. pvm = C
- D. pv = (RT)m Discuss
- 8. The absolute zero pressure can be attained at a temperature of
Options- A. 0°C
- B. 273°C
- C. 273 K
- D. none of these Discuss
- 9. The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is always __________ one.
Options- A. equal to
- B. less than
- C. greater than Discuss
- 10. Which of the following is the correct statement?
Options- A. For a given compression ratio, both Otto and Diesel cycles have the same efficiency.
- B. For a given compression ratio, Otto cycle is more efficient than Diesel cycle.
- C. For a given compression ratio, Diesel cycle is more efficient than Otto cycle.
- D. The efficiency of Otto or Diessel cycle has nothing to do with compressioin ratio. Discuss
Thermodynamics problems
Search Results
Correct Answer: both the heat and work as well as mass of the working substance crosses the boundary of the system
Correct Answer: none of these
Correct Answer: when molecular momentum of the system becomes zero
Correct Answer: 9 kg of water
Correct Answer: A Joule cycle consists of two constant volume and two isentropic processes.
Correct Answer: both temperature and volume decreases
Correct Answer: pv = mRT
Correct Answer: none of these
Correct Answer: greater than
Correct Answer: For a given compression ratio, Otto cycle is more efficient than Diesel cycle.
Comments
There are no comments.More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.