MCQOPTIONS
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MCQOPTIONS
This section includes 463 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
When the cross-section of a nozzle increases continuously from entrance to exit, it is called a |
| A. | convergent-divergent nozzle |
| B. | divergent nozzle |
| C. | convergent nozzle |
| D. | none of the mentioned |
| Answer» C. convergent nozzle | |
| 452. |
Rateau turbine is |
| A. | pressure-velocity compounded turbine |
| B. | simple reaction turbine |
| C. | velocity compounded turbine |
| D. | pressure compounded turbine |
| Answer» E. | |
| 453. |
The ratio of the useful heat drop to the isentropic heat drop is called |
| A. | condenser efficiency |
| B. | nozzle efficiency |
| C. | vacuum efficiency |
| D. | boiler efficiency |
| Answer» C. vacuum efficiency | |
| 454. |
What is the critical pressure ratio for initially wet steam? |
| A. | 0.582 |
| B. | 0.546 |
| C. | 0.577 |
| D. | 0.601 |
| Answer» B. 0.546 | |
| 455. |
The Parsons’ reaction turbine has |
| A. | only moving blades |
| B. | only fixed blades |
| C. | fixed and moving blades of different shape |
| D. | identical fixed and moving blades |
| Answer» E. | |
| 456. |
The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop |
| A. | increases |
| B. | decreases |
| C. | is unpredictable |
| D. | remains same |
| Answer» C. is unpredictable | |
| 457. |
De-Laval turbine is a |
| A. | multi rotor impulse turbine |
| B. | impulse reaction turbine |
| C. | single rotor impulse turbine |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 458. |
In rocket engines the amount of expansion in Nozzle determines the |
| A. | exit temperature |
| B. | exit pressure |
| C. | exit temperature & pressure |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 459. |
When mach number is greater than one the flow is |
| A. | subsonic |
| B. | supersonic |
| C. | laminar |
| D. | none of the mentioned |
| Answer» C. laminar | |
| 460. |
The steam leaves the nozzle at a |
| A. | low pressure and a high velocity |
| B. | high pressure and a high velocity |
| C. | high pressure and a low velocity |
| D. | low pressure and a low velocity |
| Answer» B. high pressure and a high velocity | |
| 461. |
If mach number is less than one then its flow is |
| A. | subsonic flow |
| B. | turbulent flow |
| C. | laminar flow |
| D. | none of the mentioned |
| Answer» B. turbulent flow | |
| 462. |
Nozzle is used to control direction or characteristics of flow. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 463. |
 In fountains the type of nozzle used is |
| A. | none of the mentioned |
| B. | turbulent jet |
| C. | high speed nozzle |
| D. | laminar jet |
| Answer» E. | |