MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
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. | |
| 2. |
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 c))) | |
| 3. |
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 | |
| 4. |
The expression for the overall temperature difference TOA is given by? |
| A. | t<sub>OA</sub> = boiler saturation temperature condenser temperature |
| B. | t<sub>OA</sub> = boiler saturation temperature + condenser temperature |
| C. | t<sub>OA</sub> = boiler saturation temperature x condenser temperature |
| D. | t<sub>OA</sub> = boiler saturation temperature / condenser temperature |
| Answer» B. t<sub>OA</sub> = boiler saturation temperature + condenser temperature | |
| 5. |
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 t<sub>OA</sub> |
| B. | (n/(n-1)) x t<sub>OA</sub> |
| C. | (n/(n+1)) / t<sub>OA</sub> |
| D. | (n/(n+1)) t<sub>OA</sub> |
| Answer» B. (n/(n-1)) x t<sub>OA</sub> | |
| 6. |
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. | h<sub>per heater</sub> = (a-b)/ (n + 1) |
| B. | h<sub>per heater</sub> = (a-b) x (n 1) |
| C. | h<sub>per heater</sub> = (a-b) + (n 1) |
| D. | h<sub>per heater</sub> = (a-b) (n + 1) |
| Answer» B. h<sub>per heater</sub> = (a-b) x (n 1) | |
| 7. |
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) |
| Answer» E. | |
| 8. |
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 + h<sub>f</sub> |
| B. | h x h<sub>f</sub> |
| C. | h h<sub>f</sub> |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |