McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 1. |
Steam nozzle converts |
| A. | heat energy of steam into pressure energy |
| B. | heat energy of steam into kinetic energy |
| C. | pressure energy of steam into heat energy |
| D. | pressure energy of steam into potential energy |
| Answer» B. heat energy of steam into kinetic energy | |
| 2. |
A nozzle is designed for |
| A. | maximum pressure at the outlet |
| B. | maximum discharge |
| C. | maximum pressure and maximum discharge |
| D. | maximum kinetic energy at the outlet |
| Answer» D. maximum kinetic energy at the outlet | |
| 3. |
Ideal expansion of steam through a nozzle is considered |
| A. | isothermal |
| B. | adiabatic |
| C. | polytropic |
| D. | none of the above |
| Answer» B. adiabatic | |
| 4. |
Presence of frictional effect during flow through the nozzle |
| A. | reduces the exit velocity |
| B. | increases the exit velocity |
| C. | has no effect on exit velocity |
| D. | none of the above |
| Answer» A. reduces the exit velocity | |
| 5. |
Frictional losses in the nozzle |
| A. | reduces the heat drop |
| B. | increases the heat drop |
| C. | has no effect on heat drop |
| D. | none of the above |
| Answer» A. reduces the heat drop | |
| 6. |
While steam expands in turbines, theoretically the entropy |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| D. | behaves unpredictably |
| Answer» A. remains constant | |
| 7. |
Nozzle efficiency is defined as |
| A. | ratio of isentropic heat drop to useful heat drop |
| B. | ratio of useful heat drop to isentropic heat drop |
| C. | product of useful heat drop and isentropic heat drop |
| D. | none of the above |
| Answer» B. ratio of useful heat drop to isentropic heat drop | |
| 8. |
When a nozzle operates with maximum mass flow, it is said to be |
| A. | under expanding flow |
| B. | over expanding flow |
| C. | choked flow |
| D. | none of the above |
| Answer» C. choked flow | |
| 9. |
For supersaturated flow in the nozzle, the discharge |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the above |
| Answer» A. increases | |
| 10. |
For the flow through the convergent and divergent nozzle, whole of friction loss is assumed |
| A. | in the converging portion |
| B. | in the divergent portion |
| C. | between inlet and outlet |
| D. | none of the above |
| Answer» B. in the divergent portion | |
| 11. |
The presence of friction in the nozzle |
| A. | increases the final dryness fraction of steam |
| B. | decreases the final dryness fraction of steam |
| C. | it does not affect the dryness fraction of steam |
| D. | none of the above |
| Answer» A. increases the final dryness fraction of steam | |
| 12. |
When the back pressure of a nozzle is below the critical pressure, the nozzle is said to be |
| A. | under expanding flow |
| B. | over expanding flow |
| C. | choked flow |
| D. | none of the above |
| Answer» C. choked flow | |
| 13. |
Which ideal process is carried out at the turbine in vapour power cycle? |
| A. | reversible adiabatic compression |
| B. | reversible adiabatic expansion |
| C. | reversible constant pressure heat addition |
| D. | reversible constant pressure heat rejection |
| Answer» B. reversible adiabatic expansion | |
| 14. |
The steam turbines is a |
| A. | rotary machine |
| B. | reciprocating machine |
| C. | rotodynamic machine |
| D. | none of the above |
| Answer» C. rotodynamic machine | |
| 15. |
From inlet to exit of steam nozzle, the pressure |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the above |
| Answer» B. decreases | |
| 16. |
From inlet to exit of moving blades in case of impulse turbine, the pressure |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the above |
| Answer» C. remains constant | |
| 17. |
From inlet to exit of moving blades in case of a reaction turbine, the pressure |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the above |
| Answer» B. decreases | |
| 18. |
In an impulse turbine, steam expands |
| A. | in the nozzle only |
| B. | in the moving blades only |
| C. | in the fixed and moving blades |
| D. | none of the above |
| Answer» A. in the nozzle only | |
| 19. |
In a reaction turbine, steam expands |
| A. | in the nozzle only |
| B. | in the moving blades only |
| C. | in the fixed and moving blades |
| D. | none of the above |
| Answer» C. in the fixed and moving blades | |
| 20. |
A simple impulse turbine consists of |
| A. | one set of nozzles and one set of moving blades |
| B. | two sets of nozzle and one set of moving blades |
| C. | one set each of fixed and moving blades |
| D. | none of the above |
| Answer» A. one set of nozzles and one set of moving blades | |
| 21. |
In a velocity-compounded impulse steam turbine, steam expands in |
| A. | one set of nozzles only |
| B. | more than one set of nozzles |
| C. | fixed and moving blades |
| D. | none of the above |
| Answer» A. one set of nozzles only | |
| 22. |
In a pressure-compounded impulse steam turbine, steam expands in |
| A. | nozzles and fixed blades only |
| B. | moving blades only |
| C. | fixed and moving blades both |
| D. | none of the above |
| Answer» A. nozzles and fixed blades only | |
| 23. |
In a pressure-compounded impulse steam turbine, pressure drop over each ring of moving blades |
| A. | remains constant |
| B. | is increasing |
| C. | is decreasing |
| D. | none of the above |
| Answer» A. remains constant | |
| 24. |
In a pressure-compounded impulse steam turbine, as compared to velocity compounding, the number of stages is |
| A. | less |
| B. | more |
| C. | same |
| D. | none of the above |
| Answer» B. more | |
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