MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The bypass ratio is the ratio of |
| A. | mass flow rates of two streams |
| B. | pressure ratio of inlet and exit |
| C. | volume flow rate of inlet and exit |
| D. | none of the mentioned |
| Answer» B. pressure ratio of inlet and exit | |
| 2. |
In aircraft propulsion the most widely used engine is |
| A. | turbojet |
| B. | turbofan |
| C. | turboprop |
| D. | all of the mentioned |
| Answer» C. turboprop | |
| 3. |
We cannot use regenerators and intercoolers on aircraft engines. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 4. |
The propulsive efficiency is given by |
| A. | work done by engine / propulsive power |
| B. | propulsive power / work done by engine |
| C. | energy input rate / propulsive power |
| D. | propulsive power / energy input rate |
| Answer» E. | |
| 5. |
When flying at high altitudes, |
| A. | air is of less density |
| B. | air exerts less drag force on aircraft |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 6. |
THE_PROPULSIVE_EFFICIENCY_IS_GIVEN_BY?$ |
| A. | work done by engine / propulsive power |
| B. | propulsive power / work done by engine |
| C. | energy input rate / propulsive power |
| D. | propulsive power / energy input rate |
| Answer» E. | |
| 7. |
In aircraft propulsion the most widely used engine is$ |
| A. | turbojet |
| B. | turbofan |
| C. | turboprop |
| D. | all of the mentioned |
| Answer» C. turboprop | |
| 8. |
We_cannot_use_regenerators_and_intercoolers_on_aircraft_engines.$ |
| A. | true |
| B. | false |
| Answer» B. false | |
| 9. |
In turbofans, the bypass ratio is 5-6 and in turboprop it is as high as 100. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 10. |
Removing the cowl from the fan gives us |
| A. | turbojet |
| B. | turbofan |
| C. | turboprop |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 11. |
Increasing the bypass ratio of turbofan engine ____ thrust. |
| A. | does not affect |
| B. | decreases |
| C. | increases |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 12. |
The_bypass_ratio_is_the_ratio_of |
| A. | mass flow rates of two streams |
| B. | pressure ratio of inlet and exit |
| C. | volume flow rate of inlet and exit |
| D. | none of the mentioned |
| Answer» B. pressure ratio of inlet and exit | |
| 13. |
When flying at high altitudes? |
| A. | air is of less density |
| B. | air exerts less drag force on aircraft |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 14. |
The air-fuel ratio used in jet engine is very small. |
| A. | true |
| B. | false |
| Answer» C. | |
| 15. |
The thrust developed in turbojet engine is the |
| A. | unbalanced force |
| B. | balanced force |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» B. balanced force | |
| 16. |
The processes in compressor, turbine, diffuser and nozzle are |
| A. | reversible |
| B. | adiabatic |
| C. | reversible and adiabatic |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 17. |
In the ideal case, turbine work is greater than the compressor work. |
| A. | true |
| B. | false |
| Answer» C. | |
| 18. |
The type of aircraft gas turbines include |
| A. | turbojet |
| B. | turbofan |
| C. | turboprop |
| D. | all of the mentioned |
| Answer» E. | |
| 19. |
Gas turbines are used in aircraft propulsion because |
| A. | they are light |
| B. | they are compact |
| C. | they have high power-to-weight ratio |
| D. | all of the mentioned |
| Answer» E. | |