MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Solar Energy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Organic vapours are used small plants and low powered solar thermo-mechanical systems. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
What is the minimum vapour pressure (in kPa) of the working fluid to drive a turbine? |
| A. | 300 |
| B. | 700 |
| C. | 100 |
| D. | 50 |
| Answer» C. 100 | |
| 3. |
Which of the following affects the installation of a solar thermo-mechanical system? |
| A. | Availability of land |
| B. | Availability of photovoltaics |
| C. | Availability of sunlight and clouds |
| D. | Availability of rain |
| Answer» B. Availability of photovoltaics | |
| 4. |
What is the bare minimum requirement for the construction materials used in solar thermo-mechanical systems? |
| A. | Contaminate the working fluid |
| B. | Withstand heat from the working fluid |
| C. | Withstand pressure from the working fluid |
| D. | Withstand both, heat and pressure from working fluid |
| Answer» E. | |
| 5. |
The practical heat engine _______ theoretical efficiency. |
| A. | has greater efficiency than |
| B. | has the same efficiency as that of |
| C. | has lesser efficiency as compared to the |
| D. | always has minimum efficiency equal to that of |
| Answer» D. always has minimum efficiency equal to that of | |
| 6. |
What is the main problem in a solar thermo-mechanical system as the collection (operating) temperature increases? |
| A. | Efficiency of collection system and engine decreases |
| B. | Efficiency of collection system decreases but engine efficiency increases |
| C. | Efficiency of collection system and engine increases |
| D. | Efficiency of collection system increases and engine efficiency decreases |
| Answer» C. Efficiency of collection system and engine increases | |
| 7. |
The choice of working fluid depends on the operating temperatures in the boiler. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Which of the following governs the efficiency of any practical solar thermo-mechanical system? |
| A. | Photovoltaics |
| B. | Rankine Cycle |
| C. | Brayton Cycle |
| D. | Properties of working fluid |
| Answer» E. | |
| 9. |
Which of the following best describes Brayton Cycle? |
| A. | Exhaust gas hot compressed gas expands through turbine by doing work heat exchanger rejection of heat gas goes to compressor |
| B. | Exhaust gas hot compressed gas expands through turbine by doing work heat exchanger gas goes to compressor rejection of heat |
| C. | Hot compressed gas expands through turbine by doing work exhaust gas heat exchanger rejection of heat gas goes to compressor |
| D. | Heat exchanger exhaust gas hot compressed gas expands through turbine by doing work gas goes to compressor rejection of heat |
| Answer» D. Heat exchanger exhaust gas hot compressed gas expands through turbine by doing work gas goes to compressor rejection of heat | |
| 10. |
In Stirling cycle, the heat addition and rejection take place at _________ |
| A. | constant pressure |
| B. | constant temperature |
| C. | two different temperatures |
| D. | multiple pressures |
| Answer» C. two different temperatures | |
| 11. |
How does Stirling cycle differ from Carnot cycle? |
| A. | The two adiabatic steps in Carnot cycle are replaced by two constant volume steps |
| B. | The two adiabatic steps in Carnot cycle are replaced by two constant temperature steps |
| C. | The two isothermal steps in Carnot cycle are replaced by two constant volume steps |
| D. | The two isobaric steps in Carnot cycle are replaced by two constant volume steps |
| Answer» B. The two adiabatic steps in Carnot cycle are replaced by two constant temperature steps | |
| 12. |
How can the efficiency of Rankine cycle be improved? |
| A. | By supplying heat at higher temperatures |
| B. | By supplying heat at lower temperatures |
| C. | By rejecting more heat |
| D. | By using a part of rejected heat |
| Answer» E. | |
| 13. |
Why is the efficiency of Rankine cycle less than that of Carnot cycle? |
| A. | Because of the working fluid |
| B. | Because of the turbines |
| C. | Because all the heat is not supplied at upper temperatures |
| D. | Because all the heat is supplied at upper temperatures |
| Answer» D. Because all the heat is supplied at upper temperatures | |
| 14. |
Which of the following best describes the process of an ideal Rankine cycle? |
| A. | Working fluid is heated in boiler exhaust vapour is condensed vapour runs the turbine liquid residue is pumped back into boiler |
| B. | Working fluid is heated in boiler vapour runs the turbine exhaust vapour is condensed liquid residue is pumped back into boiler |
| C. | Vapour runs the turbine working fluid is heated in boiler exhaust vapour is condensed liquid residue is pumped back into boiler |
| D. | Exhaust vapour is condensed Working fluid is heated in boiler vapour runs the turbine liquid residue is pumped back into boiler |
| Answer» C. Vapour runs the turbine working fluid is heated in boiler exhaust vapour is condensed liquid residue is pumped back into boiler | |
| 15. |
How does an ideal Rankine cycle work? |
| A. | Heat-addition process does not occur at constant temperature |
| B. | Heat-addition process occurs at temperature |
| C. | Heat-addition process does not occur at constant pressure |
| D. | Heat-addition process occurs at constant pressure |
| Answer» B. Heat-addition process occurs at temperature | |