MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 22 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Find the error in specific volume if ideal gas model is used to represent the behaviour of superheated ammonia at 40°C and 500 kPa? |
| A. | 1.5% |
| B. | 3.5% |
| C. | 4.5% |
| D. | 2.5% |
| Answer» D. 2.5% | |
| 2. |
Argon is kept in a 5 m3 tank at −30°C and 3 MPa. Determine the mass using compressibility factor. |
| A. | 208.75 kg |
| B. | 308.75 kg |
| C. | 303.75 kg |
| D. | 203.75 kg |
| Answer» C. 303.75 kg | |
| 3. |
The adiabatic efficiency of real compressor can be ____ |
| A. | less than unity |
| B. | greater than unity |
| C. | equal to unity |
| D. | none of the mentioned |
| Answer» C. equal to unity | |
| 4. |
The isothermal efficiency is given by |
| A. | Ws/Wc |
| B. | Ws/Wt |
| C. | Wt/Wc |
| D. | Wt/Ws |
| Answer» D. Wt/Ws | |
| 5. |
The adiabatic efficiency is given by |
| A. | Ws/Wc |
| B. | Ws/Wt |
| C. | Wt/Wc |
| D. | Wt/Ws |
| Answer» B. Ws/Wt | |
| 6. |
When isothermal compression is taken as ideal process, the energy imparted |
| A. | raises the temperature of gas |
| B. | raises the pressure of gas |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |
| 7. |
For ɣ>n>1 and for same pressure ratio p2/p1, the maximum work is needed for |
| A. | isothermal compression |
| B. | adiabatic compression |
| C. | polytropic compression |
| D. | all need same work |
| Answer» C. polytropic compression | |
| 8. |
THE_ADIABATIC_EFFICIENCY_IS_GIVEN_BY?$ |
| A. | Ws/Wc |
| B. | Ws/Wt |
| C. | Wt/Wc |
| D. | Wt/Ws |
| Answer» B. Ws/Wt | |
| 9. |
The adiabatic efficiency of real compressor can be ____$ |
| A. | less than unity |
| B. | greater than unity |
| C. | equal to unity |
| D. | none of the mentioned |
| Answer» C. equal to unity | |
| 10. |
The_isothermal_efficiency_is_given_by$ |
| A. | Ws/Wc |
| B. | Ws/Wt |
| C. | Wt/Wc |
| D. | Wt/Ws |
| Answer» D. Wt/Ws | |
| 11. |
Find the volume of ethylene having mass of 125 kg at 7.5 MPa and 296.5 K. |
| A. | 0.369 m<sup>3</sup> |
| B. | 0.669 m<sup>3</sup> |
| C. | 0.569 m<sup>3</sup> |
| D. | 0.469 m<sup>3</sup> |
| Answer» E. | |
| 12. |
Find the error in specific volume if ideal gas model is used to represent the behaviour of superheated ammonia at 40°C and 500 kPa?$ |
| A. | 1.5% |
| B. | 3.5% |
| C. | 4.5% |
| D. | 2.5% |
| Answer» D. 2.5% | |
| 13. |
Argon is kept in a 5 m3 tank at −30°C and 3 MPa. Determine the mass using compressibility factor.$ |
| A. | 208.75 kg |
| B. | 308.75 kg |
| C. | 303.75 kg |
| D. | 203.75 kg |
| Answer» C. 303.75 kg | |
| 14. |
For an adiabatic machine, work of compression is greater than enthalpy rise of gas. |
| A. | true |
| B. | false |
| Answer» C. | |
| 15. |
When isothermal compression is taken as ideal process, the energy imparte? |
| A. | raises the temperature of gas |
| B. | raises the pressure of gas |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |
| 16. |
In isothermal compression, all work done on gas is transformed into |
| A. | heat added into system |
| B. | heat going out of system |
| C. | internal energy increase |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 17. |
For …£>n>1 and for same pressure ratio p2/p1, the maximum work is needed for$ |
| A. | isothermal compression |
| B. | adiabatic compression |
| C. | polytropic compression |
| D. | all need same work |
| Answer» C. polytropic compression | |
| 18. |
The work of compression is ____ the shaft work. |
| A. | positive of |
| B. | negative of |
| C. | equal to |
| D. | less than |
| Answer» C. equal to | |
| 19. |
We use after-coolers to cool the gas which leaves the compressor. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 20. |
Which of the following is an advantage of cooling? |
| A. | less pipe friction losses |
| B. | reduction in volume of gas |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 21. |
If the gas is cooled during compression, work required will be ____ the adiabatic compression work. |
| A. | more than |
| B. | less than |
| C. | equal to |
| D. | none of the mentioned |
| Answer» C. equal to | |
| 22. |
A gas compression process is |
| A. | adiabatic |
| B. | involves heat transfer |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |