MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The efficiency gain follows the law of diminishing return with the increase in the number of heaters. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 2. |
If n heaters are used, the greatest gain in efficiency occurs when overall temperature rise is ____ times the difference between condenser and boiler saturation temperatures. |
| A. | (n-1) / n |
| B. | (n+1) / n |
| C. | n / (n-1) |
| D. | n / (n+1) |
| Answer» E. | |
| 3. |
The higher the number of heaters used, the ____ will be the cycle efficiency. |
| A. | lower |
| B. | higher |
| C. | efficiency does not depend on number of heaters |
| D. | none of the mentioned |
| Answer» C. efficiency does not depend on number of heaters | |
| 4. |
Which of the following is true for a closed heater? |
| A. | it requires a single pump regardless of the number of heaters |
| B. | it is costly |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 5. |
THE_HIGHER_THE_NUMBER_OF_HEATERS_USED,_THE______WILL_BE_THE_CYCLE_EFFICIENCY.?$ |
| A. | lower |
| B. | higher |
| C. | efficiency does not depend on number of heaters |
| D. | none of the mentioned |
| Answer» C. efficiency does not depend on number of heaters | |
| 6. |
The efficiency gain follows the law of diminishing return with the increase in the number of heaters.$ |
| A. | true |
| B. | false |
| Answer» B. false | |
| 7. |
If_n_heaters_are_used,_the_greatest_gain_in_efficiency_occurs_when_overall_temperature_rise_is______times_the_difference_between_condenser_and_boiler_saturation_temperatures.$ |
| A. | (n-1) / n |
| B. | (n+1) / n |
| C. | n / (n-1) |
| D. | n / (n+1) |
| Answer» E. | |
| 8. |
The thermal irreversibility should be ____ to improve the performance. |
| A. | reduced |
| B. | increased |
| C. | kept constant |
| D. | none of the mentioned |
| Answer» B. increased | |
| 9. |
Deaerator is a type of open heater. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 10. |
Which of the following is true for an open heater? |
| A. | it is simple, has low cost and low heat transfer capacity |
| B. | a pump is required at each heater |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |
| 11. |
The temperature of feedwater leaving a heater is ____ the saturation temperature at steam extraction pressure. |
| A. | less than |
| B. | equal to |
| C. | more than |
| D. | none of the mentioned |
| Answer» B. equal to | |
| 12. |
How many types of feedwater heaters are present? |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» C. three | |
| 13. |
Why both reheating and regeneration is used together? |
| A. | the effect of reheat alone on efficiency is very small |
| B. | regeneration has a marked effect on efficiency |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 14. |
The reheating of steam is used when the vaporization pressure is ____. |
| A. | low |
| B. | high |
| C. | both when low or high |
| D. | always |
| Answer» C. both when low or high | |