Thermodynamics problems
- 1. The entropy __________ in an irreversible cyclic process.
Options- A. remains constant
- B. decreases
- C. increases Discuss
Correct Answer: increases
- 2. An adiabatic process is one in which
Options- A. no heat enters or leaves the gas
- B. the temperature of the gas changes
- C. the change in internal energy is equal to the mechanical workdone
- D. all of the above Discuss
Correct Answer: all of the above
- 3. The value of 1 mm of Hg is equal to
Options- A. 1.333 N/m2
- B. 13.33 N/m2
- C. 133.3 N/m2
- D. 1333 N/m2 Discuss
Correct Answer: 133.3 N/m2
- 4. The efficiency of Diesel cycle approaches to Otto cycle efficiency when
Options- A. cut-off is increased
- B. cut-off is decreased
- C. cut-off is zero
- D. cut-off is constant Discuss
Correct Answer: cut-off is zero
- 5. The kinetic energy of molecules of a gas becomes zero at absolute zero temperature.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 6. The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.
Options- A. one-half
- B. one-third
- C. two-third
- D. three-fourth Discuss
Correct Answer: two-third
- 7. The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
Options- A. workdone
- B. entropy
- C. enthalpy
- D. none of these Discuss
Correct Answer: enthalpy
- 8. In the first law of thermodynamics, the total energy of the system remains constant.
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).
Options- A. less than
- B. equal to
- C. more than Discuss
Correct Answer: more than
- 10. A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
Options- A. Carnot cycle
- B. Stirling cycle
- C. Otto cycle
- D. Diesel cycle Discuss
Correct Answer: Diesel cycle
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