MCQOPTIONS
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MCQOPTIONS
This section includes 22 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. |
The number of heaters for a plant is fixed by? |
| A. | Mass Balance |
| B. | Energy balance |
| C. | Heat balance |
| D. | None of the mentioned |
| Answer» C. Heat balance | |
| 2. |
Efficiency gain follow the law of ____________ |
| A. | diminishing forward motion |
| B. | increasing return |
| C. | decreasing return |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 3. |
The expression for the overall temperature difference TOA is given by? |
| A. | tOA = boiler saturation temperature – condenser temperature |
| B. | tOA = boiler saturation temperature + condenser temperature |
| C. | tOA = boiler saturation temperature x condenser temperature |
| D. | tOA = boiler saturation temperature / condenser temperature |
| Answer» B. tOA = boiler saturation temperature + condenser temperature | |
| 4. |
If n denotes the number of heater, tOA denotes the overall temperature difference & Tfw denotes the total temperature rise of feedwater. The expression for Tfw is? |
| A. | (n/(n+1)) x tOA |
| B. | (n/(n-1)) x tOA |
| C. | (n/(n+1)) / tOA |
| D. | (n/(n+1)) – tOA |
| Answer» B. (n/(n-1)) x tOA | |
| 5. |
What is the expression for enthalpy of each heater hper heater if a represents the enthalpy of heated feedwater from the economiser and b represents the enthalpy at condenser & n represents the number of heaters? |
| A. | hper heater = (a-b)/ (n + 1)b) hper heater = (a-b) x (n – 1)c) hper heater = (a-b) + (n – 1)d) hper heater = (a- |
| B. | / (n + 1)b) hper heater = (a-b) x (n – 1) |
| C. | hper heater = (a-b) + (n – 1) |
| D. | hper heater = (a-b) – (n + 1) |
| Answer» B. / (n + 1)b) hper heater = (a-b) x (n – 1) | |
| 6. |
The expression for temperature rise t in feedwater heater when a & b are the temperatures of boiler saturation & condenser respectively, is given by which of the following expression? |
| A. | t = 0.5 (a x b)b) t = 0.5 (a / b)c) t = 0.5 (a + b)d) t = 0.5 (a – |
| B. | t = 0.5 (a / b) |
| C. | t = 0.5 (a + b) |
| D. | t = 0.5 (a – b) |
| Answer» E. | |
| 7. |
What is the value of “beta” if h represents the local enthalpy on the given expansion line at a given pressure & hf is the enthalpy of saturated water at that pressure? |
| A. | h + hf |
| B. | h x hf |
| C. | h – hf |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 8. |
THE_EXPRESSION_FOR_THE_OVERALL_TEMPERATURE_DIFFERENCE_T_IS_GIVEN_BY??$ |
| A. | t = boiler saturation temperature – condenser temperature |
| B. | t = boiler saturation temperature + condenser temperature |
| C. | t = boiler saturation temperature x condenser temperature |
| D. | t = boiler saturation temperature / condenser temperature |
| Answer» B. t = boiler saturation temperature + condenser temperature | |
| 9. |
The number of heaters for a plant is fixed by?$ |
| A. | Mass Balance |
| B. | Energy balance |
| C. | Heat balance |
| D. | None of the mentioned. |
| Answer» C. Heat balance | |
| 10. |
Efficiency gain follows the law of?$ |
| A. | diminishing forward motion |
| B. | increasing return |
| C. | decreasing return |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 11. |
The expression for efficiency gain due to regeneration if a, b, n correspond to alpha, beta, cycle efficiency respectively, is? |
| A. | n = ((a x a x b)/((a + b)((a + 2b)<sup>2</sup>)) |
| B. | n = ((a x a x b)/((a – b)(a + 2b)<sup>2</sup>)) |
| C. | n = ((a x a x b)/((a + b)(a + b)<sup>2</sup>)) |
| D. | n = ((a x a x b)/((a + b)(a + 2b)<sup>3</sup>)) |
| Answer» B. n = ((a x a x b)/((a ‚Äö√Ñ√∂‚àö√ë‚àö¬® b)(a + 2b)<sup>2</sup>)) | |
| 12. |
What is the relation between a & c if a & c correspond to alpha & gamma respectively, for maximum efficiency of a cycle? |
| A. | a = 3c |
| B. | c = 2a |
| C. | c = (a/3) |
| D. | a = 2c |
| Answer» E. | |
| 13. |
The expression for efficiency when a & b are two constants corresponding to alpha & beta and c corresponds to gamma, is? |
| A. | Efficiency = 1 – ((b<sup>2</sup>))/((b + c)(a + b – c))) |
| B. | Efficiency = 1 + ((b<sup>2</sup>))/((b + c)(a + b – c))) |
| C. | Efficiency = ((b<sup>2</sup>))/((b + c)(a + b – c))) |
| D. | Efficiency = 1 / ((b<sup>2</sup>))/((b + c)(a + b – c))) |
| Answer» B. Efficiency = 1 + ((b<sup>2</sup>))/((b + c)(a + b ‚Äö√Ñ√∂‚àö√ë‚àö¬® c))) | |
| 14. |
The effect on the degree of regeneration due to an increase in feedwater temperature is? |
| A. | degree of regeneration increases |
| B. | degree of regeneration decreases |
| C. | degree of regeneration remain same |
| D. | degree of regeneration is optimised |
| Answer» E. | |
| 15. |
If n denotes the number of heater, t denotes the overall temperature difference & T denotes the total temperature rise of feedwater. The expression for T is? |
| A. | ( n/(n+1)) x t |
| B. | ( n/(n-1)) x t |
| C. | ( n/(n+1)) / t |
| D. | ( n/(n+1)) – t |
| Answer» B. ( n/(n-1)) x t | |
| 16. |
What is the expression for enthalpy of each heater h heater if a represents the enthalpy of heated feedwater from the economiser and b represents the enthalpy at condenser & n represents the number of heaters? |
| A. | h heater = ( a-b )/ (n +1) |
| B. | h heater = ( a-b ) x (n -1) |
| C. | h heater = ( a-b ) + (n -1) |
| D. | h heater = ( a-b ) – (n +1) |
| Answer» B. h heater = ( a-b ) x (n -1) | |
| 17. |
The temperature rise from condenser to boiler saturation is divided __________ among the feedwater heaters for maximum gain in efficiency. |
| A. | unequally |
| B. | partially |
| C. | equally |
| D. | remains undivided |
| Answer» D. remains undivided | |
| 18. |
The feedwater in the Economiser _________ |
| A. | is heated by bled turbine steam |
| B. | is cooled by bled turbine steam |
| C. | is heated by outgoing flue gases |
| D. | is cooled by outgoing flue gases |
| Answer» D. is cooled by outgoing flue gases | |
| 19. |
The economiser can also be assumed as? |
| A. | Feedwater cooler |
| B. | Feedwater heater |
| C. | Economiser has nothing to do with Feedwater |
| D. | None of the mentioned |
| Answer» C. Economiser has nothing to do with Feedwater | |
| 20. |
What happens to the feedwater that enters the economiser? |
| A. | Feedwater is heated to the saturation temperature at the boiler pressure |
| B. | Feedwater is heated to the boiler temperature at the saturation pressure |
| C. | Feedwater is cooled to the saturation temperature |
| D. | Feedwater is cooled at the boiler pressure |
| Answer» B. Feedwater is heated to the boiler temperature at the saturation pressure | |
| 21. |
The expression for temperature rise t in feedwater heater when a & b are the temperatures of boiler saturation & condenser resprctively, is given by which of the following expression? |
| A. | t = 0.5 (a x b) |
| B. | t = 0.5 (a / b) |
| C. | t = 0.5 (a + b) |
| D. | t = 0.5 (a – b) |
| Answer» E. | |
| 22. |
What is the value of “beta” if h represents the local enthalpy on the given expansion line at a given pressure & hf is the enthalpy of saturated water at that pressure? |
| A. | h + hf |
| B. | h x hf |
| C. | h – hf |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |