MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Thermal Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Determine the velocity of steam at throat if the discharge through the nozzle is maximum. Steam enters the nozzle in dry and saturated state and at 11 bar. |
| A. | 455.45 m/s |
| B. | 625.32 m/s |
| C. | 545.87 m/s |
| D. | 325.65 m/s |
| Answer» B. 625.32 m/s | |
| 2. |
The maximum mass flow through a steam nozzle is independent of _____ |
| A. | Initial pressure |
| B. | Initial density |
| C. | Final pressure |
| D. | Throat area |
| Answer» D. Throat area | |
| 3. |
Steam enters a nozzle at 14 bar and 200 C. Determine the discharge if the discharge through the nozzle is maximum. Take the area of throat as 0.002 m2. |
| A. | 3.95 kg/s |
| B. | 4.18 kg/s |
| C. | 2.36 kg/s |
| D. | 1.65 kg/s |
| Answer» C. 2.36 kg/s | |
| 4. |
Calculate the throat pressure if the dry and saturated steam enters a nozzle at 15 bar. Consider the discharge through the nozzle maximum. |
| A. | 8.66 bar |
| B. | 7.58 bar |
| C. | 5.65 bar |
| D. | 2.36 bar |
| Answer» B. 7.58 bar | |
| 5. |
Which of the following equations represent the correct critical pressure ratio? |
| A. | ( frac{P_1}{P_2} = ( frac{2}{n+1})^ frac{n}{n-1} ) |
| B. | ( frac{P_2}{P_1} = ( frac{2}{n-1})^ frac{n}{n-1} ) |
| C. | ( frac{P_2}{P_1} = ( frac{2}{n+1})^ frac{n}{n-1} ) |
| D. | ( frac{P_2}{P_1} = ( frac{2}{n+1})^ frac{n}{n+1} ) |
| Answer» D. ( frac{P_2}{P_1} = ( frac{2}{n+1})^ frac{n}{n+1} ) | |
| 6. |
Dry saturated steam enters a steam nozzle at 12 bar and 200 C and leaves at 2 bar. If the exit area is 0.00197 m2, determine the mass flow rate of steam. |
| A. | 1 kg/s |
| B. | 2 kg/s |
| C. | 3 kg/s |
| D. | 4 kg/s |
| Answer» C. 3 kg/s | |
| 7. |
Final velocity of steam passing thorough a nozzle is found out to be 586 m/s. The pressure of steam at inlet is 15 bar and is dry and saturated. The exit pressure is 2 bar. Determine the dryness fraction of the steam when it leaves the nozzle. |
| A. | 0.79 |
| B. | 0.96 |
| C. | 0.88 |
| D. | 0.81 |
| Answer» C. 0.88 | |
| 8. |
Dry and saturated steam enters a nozzle at 11 bar and leaves at 2 bar. What minimum exit area should the nozzle have if the steam flow of 2 kg/s is to be maintained? |
| A. | 0.00365 m<sup>2</sup> |
| B. | 0.02156 m<sup>2</sup> |
| C. | 0.00312 m<sup>2</sup> |
| D. | 0.00228 m<sup>2</sup> |
| Answer» E. | |
| 9. |
Steam entering a nozzle at 15 bar and 350 C is discharged at 1 bar. If the inlet velocity of the steam is 50 m/s, determine the exit velocity. |
| A. | 785 m/s |
| B. | 365 m/s |
| C. | 565 m/s |
| D. | 475 m/s |
| Answer» D. 475 m/s | |
| 10. |
Steam at a temperature 200 C and pressure 4 bar enters a steam nozzles and is discharged at 1 bar pressure. Determine the exit velocity of steam if the inlet velocity is negligible. |
| A. | 500 m/s |
| B. | 720 m/s |
| C. | 580 m/s |
| D. | 750 m/s |
| Answer» C. 580 m/s | |
| 11. |
The steam flow though nozzle is considered to be _____ |
| A. | adiabatic |
| B. | isobaric |
| C. | isothermal |
| D. | isochoric |
| Answer» B. isobaric | |
| 12. |
The smallest section of a steam nozzle is called _____ |
| A. | maw |
| B. | neck |
| C. | throat |
| D. | muzzle |
| Answer» D. muzzle | |
| 13. |
Which of the following statements about steam nozzles is FALSE? |
| A. | It converts the heat energy of the steam into kinetic energy |
| B. | It has a varying cross section |
| C. | The smallest section is called throat |
| D. | The pressure at the outlet is more than at the inlet |
| Answer» E. | |
| 14. |
A steam nozzle is a passage of varying cross section through which the kinetic energy of steam is converted into heat energy. |
| A. | True |
| B. | False |
| Answer» C. | |