Thermodynamics problems
- 1. 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
Correct Answer: pv = mRT
- 2. 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
Correct Answer: none of these
- 3. 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
Correct Answer: greater than
- 4. 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
Correct Answer: For a given compression ratio, Otto cycle is more efficient than Diesel cycle.
- 5. When a gas is heated at constant pressure
Options- A. its temperature will increase
- B. its volume will increase
- C. both temperature and volume will increase
- D. neither temperature not volume will increase Discuss
Correct Answer: both temperature and volume will increase
- 6. The standard value of atmospheric pressure taken at sea level is
Options- A. 1.013 bar
- B. 760 mm of Hg
- C. 1013 x 102 N/m2
- D. all of these Discuss
Correct Answer: all of these
- 7. The principal constituents of a fuel are
Options- A. carbon and hydrogen
- B. oxygen and hydrogen
- C. sulphur and oxygen
- D. sulphur and hydrogen Discuss
Correct Answer: carbon and hydrogen
- 8. The work ratio of simple gas turbine cycle depends upon
Options- A. maximum cycle temperature
- B. minimum cycle temperature
- C. pressure ratio
- D. all of these Discuss
Correct Answer: all of these
- 9. The efficiency of Otto cycle depends upon the specific heats of the working substance.
Options- A. Yes
- B. No Discuss
Correct Answer: No
- 10. When the gas is heated at constant volume, the heat supplied
Options- A. increases the internal energy of the gas and increases the temperature of the gas
- B. does some external work during expansion
- C. Both (A) and (B)
- D. None of these Discuss
Correct Answer: increases the internal energy of the gas and increases the temperature of the gas
More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.