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 of Brayton cycle can be increased by using staged heat supply or by use of staged compression with intercooling. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 2. |
The relation between maximum pressure ratio and optimum pressure ratio is given by |
| A. | optimum pressure ratio = (maximum pressure ratio)/2 |
| B. | optimum pressure ratio = maximum pressure ratio |
| C. | optimum pressure ratio = sqrt(maximum pressure ratio) |
| D. | optimum pressure ratio = (maximum pressure ratio)^2 |
| Answer» D. optimum pressure ratio = (maximum pressure ratio)^2 | |
| 3. |
The optimum value of pressure ratio at which work capacity becomes maximum is given by |
| A. | (Tmin/Tmax)^((ɣ-1)/2ɣ) |
| B. | (Tmax/Tmin)^(ɣ/2(ɣ-1)) |
| C. | (Tmax/Tmin)^(2(ɣ-1)/ɣ) |
| D. | (Tmax/Tmin)^(2ɣ/(ɣ-1)) |
| Answer» C. (Tmax/Tmin)^(2(ɣ-1)/ɣ) | |
| 4. |
The maximum pressure ratio is given by |
| A. | (Tmin/Tmax)^((ɣ-1)/ɣ) |
| B. | (Tmin/Tmax)^(ɣ/(ɣ-1)) |
| C. | (Tmax/Tmin)^((ɣ-1)/ɣ) |
| D. | (Tmax/Tmin)^(ɣ/(ɣ-1)) |
| Answer» E. | |
| 5. |
As the pressure ratio increases, the efficiency steadily ____ |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» C. remains constant | |
| 6. |
The ____ the pressure ratio, the ____ will be efficiency. |
| A. | less, more |
| B. | less, less |
| C. | more, more |
| D. | more, less |
| Answer» D. more, less | |
| 7. |
When the turbine efficiency and compressor efficiency decreases, the cycle efficiency ____ |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» B. increases | |
| 8. |
When we add a regenerator, cycle efficiency always increases. |
| A. | true |
| B. | false |
| Answer» C. | |
| 9. |
Which of the following is true about a regenerator? |
| A. | it is costly |
| B. | it is heavy and bulky |
| C. | it causes pressure losses |
| D. | all of the mentioned |
| Answer» E. | |
| 10. |
By using a regenerator, |
| A. | efficiency increases, work output decreases |
| B. | both efficiency and work output increases |
| C. | efficiency increases, work output remains unchanged |
| D. | efficiency remains same, work output increases |
| Answer» D. efficiency remains same, work output increases | |
| 11. |
Which of the following statement is true for a regenerator? |
| A. | mean temperature of heat addition decreases |
| B. | mean temperature of heat rejection decreases |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |
| 12. |
In the regenerator, |
| A. | temperature of air leaving the compressor is raised |
| B. | temperature of air leaving the turbine is raised |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» B. temperature of air leaving the turbine is raised | |
| 13. |
The temperature of air leaving turbine is less than that of air leaving compressor. |
| A. | true |
| B. | false |
| Answer» C. | |
| 14. |
How can regeneration be used to improve the efficiency of Brayton cycle? |
| A. | the energy of exhaust gas can be used to heat up the air which leaves the compressor |
| B. | heat supplied from external source thus decreases |
| C. | the amount of heat rejected also decreases |
| D. | all of the mentioned |
| Answer» E. | |