MCQOPTIONS
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MCQOPTIONS
This section includes 9 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 condition of supersonic flow through throat with adiabatic conditions is called the design pressure ratio of nozzle. |
| A. | true |
| B. | false |
| Answer» C. | |
| 2. |
At the choking limit, nozzle passes the ____ mass flow. |
| A. | maximum |
| B. | minimum |
| C. | constant |
| D. | all of the mentioned |
| Answer» B. minimum | |
| 3. |
For diatomic gases, critical pressure ratio is equal to |
| A. | 0.528 |
| B. | 0.628 |
| C. | 0.728 |
| D. | 0.828 |
| Answer» B. 0.628 | |
| 4. |
Which of the following relation is correct?(asterik * indicates critical properties) |
| A. | T*/T = 2/ɣ |
| B. | T*/T = 2/(ɣ-1) |
| C. | T*/T = 2/(ɣ+1) |
| D. | T*/T = 2/(ɣ-2) |
| Answer» D. T*/T = 2/(ɣ-2) | |
| 5. |
When are properties at throat termed as critical? |
| A. | when M=1 |
| B. | discharge is maximum |
| C. | nozzle is choked |
| D. | all of the mentioned |
| Answer» E. | |
| 6. |
Which of the following statement is true about velocity of gas when it is subsonic? |
| A. | it is subsonic before throat |
| B. | becomes sonic at throat |
| C. | becomes supersonic till its exit |
| D. | all of the mentioned |
| Answer» E. | |
| 7. |
Where do we have the value of Mach number as 1 ? |
| A. | at the start of flow |
| B. | at the throat |
| C. | at the end of flow |
| D. | everywhere along the nozzle or diffuser |
| Answer» C. at the end of flow | |
| 8. |
Which of the following relation is correct?a) (dA)/A = (M + 1)*(dV/V)b) (dA)/A = (M – 1)*(dV/V)c) (dA)/A = (M2 + 1)*(dV/V)d) (d |
| A. | (dA)/A = (M + 1)*(dV/V) |
| B. | (dA)/A = (M – 1)*(dV/V) |
| C. | (dA)/A = (M2 + 1)*(dV/V) |
| D. | (dA)/A = (M2 – 1)*(dV/V) |
| Answer» E. | |
| 9. |
The discharge is maximum when Mach number is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | infinity |
| Answer» C. 2 | |