MCQOPTIONS
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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. |
For uncooled rotary compressor, compression process is ____ while ideal process is ____ |
| A. | isothermal, adiabatic |
| B. | isentropic, adiabatic |
| C. | adiabatic, isentropic |
| D. | adiabatic, isothermal |
| Answer» D. adiabatic, isothermal | |
| 2. |
Which of the following is true for an axial-flow compressor? |
| A. | blades are arranged in same manner as in reaction turbine |
| B. | flow of air is along the axis of compressor |
| C. | velocity of air changes when it passes through the blades |
| D. | all of the mentioned |
| Answer» E. | |
| 3. |
Which of the following is true for a centrifugal compressor? |
| A. | rotation of impeller compresses the air |
| B. | diffuser converts part of KE into internal energy |
| C. | typical pressure ratio is around 1.4 to 1 |
| D. | all of the mentioned |
| Answer» E. | |
| 4. |
The centrifugal and axial flow compressor are the types of |
| A. | displacement compressor |
| B. | steady-flow compressor |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |
| 5. |
The vane type compressor requires ____ the Roots blower. |
| A. | equal work input |
| B. | more work input |
| C. | less work input |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 6. |
In reciprocating compressor pressure increases due to- |
| A. | Decrease of volume |
| B. | Increase of temperature |
| C. | Decrease of temperature |
| D. | None of these |
| Answer» B. Increase of temperature | |
| 7. |
In which of the following types of compressors are the motor and compressor enclosed in the same housing? |
| A. | Axial flow type compressor |
| B. | Reciprocating compressor |
| C. | Open-type compressor |
| D. | Hermetic compressor |
| Answer» E. | |
| 8. |
Isothermal compression for the high-speed compressor is achieved by the method |
| A. | water jacketing |
| B. | inter-cooling |
| C. | external fins |
| D. | all the above |
| Answer» E. | |
| 9. |
Compression ratio for compressor is always |
| A. | more than 1.0 |
| B. | less than 1.0 |
| C. | equal to 1.0 |
| D. | zero |
| Answer» B. less than 1.0 | |
| 10. |
THE_CENTRIFUGAL_AND_AXIAL_FLOW_COMPRESSOR_ARE_THE_TYPES_OF?$ |
| A. | displacement compressor |
| B. | steady-flow compressor |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |
| 11. |
Which of the following is true for an axial-flow compressor?$ |
| A. | blades are arranged in same manner as in reaction turbine |
| B. | flow of air is along the axis of compressor |
| C. | velocity of air changes when it passes through the blades |
| D. | all of the mentioned |
| Answer» E. | |
| 12. |
Which_of_the_following_is_true_for_a_centrifugal_compressor?$ |
| A. | rotation of impeller compresses the air |
| B. | diffuser converts part of KE into internal energy |
| C. | typical pressure ratio is around 1.4 to 1 |
| D. | all of the mentioned |
| Answer» E. | |
| 13. |
In an adiabatic irreversible process, extra work is done to overcome friction. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 14. |
For_uncooled_rotary_compressor,_compression_process_is______while_ideal_process_is_____ |
| A. | isothermal, adiabatic |
| B. | isentropic, adiabatic |
| C. | adiabatic, isentropic |
| D. | adiabatic, isothermal |
| Answer» D. adiabatic, isothermal | |
| 15. |
The vane type compressor requires ____ the Roots blower? |
| A. | equal work input |
| B. | more work input |
| C. | less work input |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 16. |
For a Root blower, as pressure ratio increases, efficiency ____ |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» C. remains constant | |
| 17. |
The Roots blower and vane-type compressor are the types of |
| A. | displacement compressor |
| B. | steady-flow compressor |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» B. steady-flow compressor | |
| 18. |
The rotary positive displacement machines are ____ and compression is ____ |
| A. | cooled, isothermal |
| B. | uncooled, isothermal |
| C. | cooled, adiabatic |
| D. | uncooled, adiabatic |
| Answer» E. | |
| 19. |
In displacement compressor, compression occurs by |
| A. | transfer of kinetic energy |
| B. | transfer of potential energy |
| C. | trapping air |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 20. |
In steady-flow compressor, compression occurs by |
| A. | transfer of kinetic energy |
| B. | transfer of potential energy |
| C. | trapping air |
| D. | all of the mentioned |
| Answer» B. transfer of potential energy | |
| 21. |
Rotary compressor can be classified as |
| A. | displacement compressor |
| B. | steady-flow compressor |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 22. |
Rotary compressors are used where ____ quantities of gas are needed at relatively ____ pressure. |
| A. | large, high |
| B. | large, low |
| C. | small, high |
| D. | small, low |
| Answer» C. small, high | |