MCQOPTIONS
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MCQOPTIONS
This section includes 21 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. |
For pressure ratio = 1, efficiency = 0, then? |
| A. | reheat is used |
| B. | reheat is not used |
| C. | only reheat is used |
| D. | none of the mentioned |
| Answer» C. only reheat is used | |
| 2. |
What is the most preferable dryness fraction of the exhaust steam? |
| A. | 0.99 |
| B. | 0.77 |
| C. | 0.66 |
| D. | 0.88 |
| Answer» E. | |
| 3. |
REHEAT_IS_PREFERRED_FOR_THE_PLANTS_HAVING_EFFICIENCY_GREATER_THAN?$ |
| A. | 150MW |
| B. | 200MW |
| C. | 100MW |
| D. | 250MW |
| Answer» D. 250MW | |
| 4. |
WHAT_IS_THE_MOST_PREFERABLE_DRYNESS_FRACTION_OF_THE_EXHAUST_STEAM??$ |
| A. | 0.99 |
| B. | 0.77 |
| C. | 0.66 |
| D. | 0.88 |
| Answer» E. | |
| 5. |
Which_one_of_the_following_is_an_advantage_of_reheat_cycle$ |
| A. | the size of the Low pressure (LP) turbine blades is reduced because specific volume is reduced by 7 to 8% |
| B. | the reheating reduce 4 to 5% fuel consumption with a corresponding reduction in the fuel handling |
| C. | lower steam pressures and temperatures and less costly materials can be used to obtain the required thermal performance |
| D. | all of the mentioned |
| Answer» E. | |
| 6. |
For_pressure_ratio_=_1,_efficiency_=_0,$ |
| A. | reheat is used |
| B. | reheat is not used |
| C. | only reheat is used |
| D. | none of the mentioned |
| Answer» C. only reheat is used | |
| 7. |
What should be the dryness fraction at the time of exhaust? |
| A. | 0.88 |
| B. | 0.80 |
| C. | 0.90 |
| D. | 0.75 |
| Answer» B. 0.80 | |
| 8. |
The optimum reheat pressure for most of the power plants is how many times of the initial steam pressure? |
| A. | 0.1-0.15 |
| B. | 0.2-0.20 |
| C. | 0.2-0.25 |
| D. | 0.1-0.10 |
| Answer» D. 0.1-0.10 | |
| 9. |
What is the effect of reheat on steam quality? |
| A. | increases |
| B. | decreases |
| C. | does not change |
| D. | depends on several parameters |
| Answer» B. decreases | |
| 10. |
What is the effect of decrease of reheat pressure on the quality of steam at turbine exhaust? |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» C. remains same | |
| 11. |
The optimum reheat pressure for the most of the modern power plants is ___________ of the initial steam pressure |
| A. | 0.1-0.5 |
| B. | 0.2-0.3 |
| C. | 0.2-0.25 |
| D. | 0.25-0.3 |
| Answer» D. 0.25-0.3 | |
| 12. |
Which of the following problems are posed by increasing the number of reheats? |
| A. | Cost & Fabrication problems arise |
| B. | Heat transfer problems arise |
| C. | Frictional losses arise |
| D. | None of the mentioned |
| Answer» B. Heat transfer problems arise | |
| 13. |
The cycle efficiency in a single reheat plant is influenced by |
| A. | pressure at tubine inlet |
| B. | pressure at which steam is reheated |
| C. | temperature at which steam is reheated |
| D. | temperature at tubine inlet |
| Answer» C. temperature at which steam is reheated | |
| 14. |
Net Work output of the plant __________ with reheat. |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» C. remains same | |
| 15. |
Why don’t we use more than two reheats?$ |
| A. | not economical |
| B. | increased mechanical stresses |
| C. | net efficiency is decreased |
| D. | all of the mentioned |
| Answer» E. | |
| 16. |
Why is the steam not allowed to expand deep into the two phase region before it is taken to reheating? |
| A. | to control flow rate |
| B. | to control phase change |
| C. | to protect reheat tubes |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 17. |
Efficiency of cycle will increase due to Reheating if |
| A. | mean temperature of heat addition in boiler is higher than in reheat process |
| B. | mean temperature of heat addition in boiler is lower than in reheat process |
| C. | it will increase without any conditions |
| D. | it will not increase |
| Answer» B. mean temperature of heat addition in boiler is lower than in reheat process | |
| 18. |
What is the effect of reheat pressure on mean temperature of heat addition Tml? |
| A. | Reheat pressure is directly proportional to Tml |
| B. | Reheat pressure is inversely proportional to Tml |
| C. | Reheat pressure is equal to Tml |
| D. | Tml is independent of reheat pressure |
| Answer» B. Reheat pressure is inversely proportional to Tml | |
| 19. |
Reheating of steam |
| A. | decreases steam rate |
| B. | increases steam rate |
| C. | no effect on steam rate |
| D. | none of the mentioned |
| Answer» B. increases steam rate | |
| 20. |
The product of heat rate & efficiency when the heat rate is expressed in kJ/kWh is equal to? |
| A. | 60 |
| B. | 36 |
| C. | 360 |
| D. | 3600 |
| Answer» E. | |
| 21. |
The product of steam rate & network when the steam rate is expressed in kg/kWh is equal to? |
| A. | 36 |
| B. | 360 |
| C. | 3600 |
| D. | 60 |
| Answer» D. 60 | |