MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Power Plant knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as? |
| A. | pass out turbine |
| B. | impulse turbine |
| C. | low pressure turbine |
| D. | high pressure turbine |
| Answer» B. impulse turbine | |
| 2. |
The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as? |
| A. | regenerative heating |
| B. | reheating of steam |
| C. | bleeding |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 3. |
In order to reduce the rotor speed of an impulse turbine, the method employed is ____________ |
| A. | pressure compounding |
| B. | velocity compounding |
| C. | pressure-velocity compounding |
| D. | all of the mentioned |
| Answer» E. | |
| 4. |
A nozzle is said to be a divergent nozzle ____________ |
| A. | when the cross-section of the nozzle increases continuously from entrance to exit |
| B. | when the cross-section of the nozzle decreases continuously from entrance to exit |
| C. | when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit |
| D. | none of the mentioned |
| Answer» B. when the cross-section of the nozzle decreases continuously from entrance to exit | |
| 5. |
The ratio of the work done on the blades per kg of steam to the total energy supplied per stage per kg of steam is called? |
| A. | nozzle efficiency |
| B. | stage efficiency |
| C. | mechanical efficiency |
| D. | blading efficiency |
| Answer» C. mechanical efficiency | |
| 6. |
IN_AN_IMPULSE_TURBINE,_STEAM_EXPANDS?$ |
| A. | wholly in nozzle |
| B. | partly in the nozzle and partly in blades |
| C. | wholly in blades |
| D. | none of the mentioned |
| Answer» B. partly in the nozzle and partly in blades | |
| 7. |
The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as$ |
| A. | regenerative heating |
| B. | reheating of steam |
| C. | bleeding |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 8. |
A steam nozzle converts$ |
| A. | heat energy of steam into potential energy |
| B. | potential energy into heat energy of steam |
| C. | heat energy of steam into kinetic energy |
| D. | kinetic energy into heat energy of steam |
| Answer» D. kinetic energy into heat energy of steam | |
| 9. |
A stage, in reaction turbine, is represented by |
| A. | each row of blades |
| B. | number of entries of steam |
| C. | number of exits of steam |
| D. | none of the mentioned |
| Answer» B. number of entries of steam | |
| 10. |
A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as |
| A. | pass out turbine |
| B. | impulse turbine |
| C. | low pressure turbine |
| D. | high pressure turbine |
| Answer» B. impulse turbine | |
| 11. |
If the critical pressure ratio for steam is 0.546, then the steam is initially |
| A. | wet |
| B. | dry saturated |
| C. | superheated |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 12. |
In order to reduce the rotor speed of an impulse turbine, the method employed is |
| A. | pressure compounding |
| B. | velocity compounding |
| C. | pressure-velocity compounding |
| D. | all of the mentioned |
| Answer» E. | |
| 13. |
The critical pressure ratio for initially dry saturated steam is |
| A. | 0.546 |
| B. | 0.577 |
| C. | 0.586 |
| D. | 0.578 |
| Answer» C. 0.586 | |
| 14. |
The reheat factor depends upon |
| A. | exit pressure |
| B. | turbine stage efficiency |
| C. | initial pressure and superheat |
| D. | all of the mentioned |
| Answer» E. | |
| 15. |
The ratio of the isentropic heat drop to the heat supplied, is called |
| A. | stage efficiency |
| B. | reheat factor |
| C. | internal efficiency |
| D. | rankine efficiency |
| Answer» E. | |
| 16. |
A nozzle is said to be a divergent nozzle |
| A. | when the cross-section of the nozzle increases continuously from entrance to exit |
| B. | when the cross-section of the nozzle decreases continuously from entrance to exit |
| C. | when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit |
| D. | none of the mentioned |
| Answer» B. when the cross-section of the nozzle decreases continuously from entrance to exit | |
| 17. |
The ratio of the work done on the blades per kg of steam to the total energy supplied per stage per kg of steam is called |
| A. | nozzle efficiency |
| B. | stage efficiency |
| C. | mechanical efficiency |
| D. | blading efficiency |
| Answer» C. mechanical efficiency | |
| 18. |
The purpose of governing in steam turbines is to |
| A. | reheat the steam and improve its quality |
| B. | maintain the speed of the turbine |
| C. | reduce the effective heat drop |
| D. | completely balance against end thrust |
| Answer» C. reduce the effective heat drop | |