MCQOPTIONS
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MCQOPTIONS
This section includes 45 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following sentences are correct for steam turbine? 1. Steam turbine requires large floor area 2. Steam turbine is a rotary high speed machine 3. Steam turbine has low weight to power ratio 4. Steam turbine has more initial cost and maintenance cost |
| A. | (1) and (2) |
| B. | (2) and (3) |
| C. | (3) and (4) |
| D. | (1) and (4) |
| Answer» C. (3) and (4) | |
| 2. |
Which of the following is/are example/s of rotary displacement pumps? |
| A. | Gear pump |
| B. | Vane pump |
| C. | Rotary piston pump |
| D. | All of the above |
| Answer» E. | |
| 3. |
Which of the following is NOT a type of rotary compressor? |
| A. | Positive displacement type of compressor |
| B. | Steady flow compressor |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» E. | |
| 4. |
Which of the following components of reaction turbine increases the head on the turbine by an amount equal to the height of runner outlet above the tail race? |
| A. | Scroll casing |
| B. | Guide vanes |
| C. | Moving vanes |
| D. | Draft tube |
| Answer» E. | |
| 5. |
Which of the following are effects of nozzle friction? 1. Enthalpy drop decreases 2. Exit velocity reduces 3. Decrease in specific volume 4. Decrease in mass flow rate |
| A. | (1), (2) and (3) |
| B. | (2), (3) and (4) |
| C. | (1), (3) and (4) |
| D. | (1), (2) and (4) |
| Answer» E. | |
| 6. |
Which component of fluid velocity is responsible for transmission of power through rotodynamic machine? |
| A. | Radial |
| B. | Axial |
| C. | Tangential |
| D. | None of the above |
| Answer» D. None of the above | |
| 7. |
What is the ratio of the actual work absorbed by an axial flow compressor to the theoretical work called? |
| A. | Work input factor |
| B. | Workdone factor |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 8. |
What is the ratio of isentropic work to Euler work in an centrifugal compressor called? |
| A. | Work coefficient |
| B. | Velocity coefficient |
| C. | Pressure coefficient |
| D. | Flow coefficient |
| Answer» D. Flow coefficient | |
| 9. |
What is the formula for forces exerted by fluid on a body? |
| A. | (Rate of momentum in) x (Rate of momentum out) |
| B. | (Rate of momentum in) – (Rate of momentum out) |
| C. | (Rate of momentum in) + (Rate of momentum out) |
| D. | None of the above |
| Answer» C. (Rate of momentum in) + (Rate of momentum out) | |
| 10. |
What is the effect of increasing flow coefficient (Φ) in an axial flow compressor on blade loading coefficient (Ψ)? |
| A. | Blade loading coefficient (Ψ) increases |
| B. | Blade loading coefficient (Ψ) decreases |
| C. | Blade loading coefficient (Ψ) remains constant |
| D. | Unpredictable |
| Answer» C. Blade loading coefficient (Ψ) remains constant | |
| 11. |
Vaneless diffusers are suitable for ___________. |
| A. | only low pressure rise |
| B. | only high pressure rise |
| C. | both low as well as high pressure rise |
| Answer» B. only high pressure rise | |
| 12. |
__________ turbines are also called as parallel flow turbine. |
| A. | Radial flow |
| B. | Axial flow |
| C. | Both radial flow and axial flow |
| D. | None of the above |
| Answer» C. Both radial flow and axial flow | |
| 13. |
The water from runner in reaction turbine is discharged into tail race through a draft tube which has ____________ cross sectional area. |
| A. | constant |
| B. | gradually decreasing |
| C. | gradually increasing |
| D. | uneven |
| Answer» D. uneven | |
| 14. |
The volute pumps and vortex volute pumps are __________ pumps with _________ shaft. |
| A. | multistage, horizontal |
| B. | multistage, vertical |
| C. | single stage, horizontal |
| D. | single stage, vertical |
| Answer» D. single stage, vertical | |
| 15. |
The runner of __________ turbine always be under pressure of above atmospheric |
| A. | Turgo |
| B. | Girand |
| C. | Kaplan |
| D. | None of the above |
| Answer» D. None of the above | |
| 16. |
The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal compressor is called as _________. |
| A. | velocity factor |
| B. | slip factor |
| C. | work factor |
| D. | none of the above |
| Answer» C. work factor | |
| 17. |
The radial force in rotodynamic machine, which is developed by rate of change of momentum in radial velocity, is taken care by__________. |
| A. | journal bearing |
| B. | radial thrust bearing |
| C. | both a. and b. |
| D. | none of the above |
| Answer» B. radial thrust bearing | |
| 18. |
The quality of vapour at the exit of nozzle ___________ due to nozzle friction. |
| A. | increases |
| B. | decreases |
| C. | does not change |
| D. | unpredictable |
| Answer» B. decreases | |
| 19. |
The product of force (F) and time (t) is called as________. |
| A. | momentum |
| B. | work done |
| C. | impulse |
| D. | pressure |
| Answer» D. pressure | |
| 20. |
The process of filling the liquid into the suction pipe and pump casing upto the level of delivery valve is called as _________. |
| A. | filling |
| B. | pumping |
| C. | priming |
| D. | leveling |
| Answer» D. leveling | |
| 21. |
The pressure of water is atmospheric and remains constant while passing over the runner in __________ . |
| A. | Impulse turbine |
| B. | Reaction turbine |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Reaction turbine | |
| 22. |
The passage of uniformly varying cross-section in which the kinetic energy of steam increases at the expense of its pressure is called as__________ |
| A. | steam turbine |
| B. | steam nozzle |
| C. | steam area |
| D. | all of the above |
| Answer» C. steam area | |
| 23. |
The nozzle efficiency can be defined as the ratio of |
| A. | isentropic enthalpy drop to actual enthalpy drop |
| B. | actual enthalpy drop to isentropic enthalpy drop |
| C. | isothermal enthalpy drop to isentropic enthalpy drop |
| D. | isentropic enthalpy drop to isothermal enthalpy drop |
| Answer» C. isothermal enthalpy drop to isentropic enthalpy drop | |
| 24. |
The mass flow rate of air compressed in axial flow compressor is _____________centrifugal compressor. |
| A. | lower than |
| B. | higher than |
| C. | same as |
| D. | unpredictable |
| Answer» C. same as | |
| 25. |
The gates of aerofoil section in between the outer and inner ring of guide wheel are called as ________. |
| A. | guide gates |
| B. | guide vanes |
| C. | scrolling gates |
| D. | scrolling vanes |
| Answer» C. scrolling gates | |
| 26. |
The function of _________ is to convert high kinetic energy of gases into pressure energy. |
| A. | impeller |
| B. | diffuser |
| C. | casing |
| D. | None of the above |
| Answer» C. casing | |
| 27. |
The diffuser blades are kept ______ the number of impeller blades . |
| A. | 1/10 th of |
| B. | 1/3 rd of |
| C. | 10 times |
| D. | 3 times |
| Answer» C. 10 times | |
| 28. |
The blade speed ratio of impulse turbine is given as ___________ |
| A. | (Blade velocity) / (Steam velocity at inlet) |
| B. | (Blade velocity) / (Steam velocity at exit) |
| C. | (Steam velocity at inlet) / (Blade velocity) |
| D. | (Steam velocity at exit) / (Blade velocity) |
| Answer» B. (Blade velocity) / (Steam velocity at exit) | |
| 29. |
The blade passages in a compressor are ________ |
| A. | converging |
| B. | diverging |
| C. | constant |
| D. | unpredictable |
| Answer» C. constant | |
| 30. |
The basic principle of operation of axial flow compressor is _______that of the centrifugal compressor. |
| A. | same as |
| B. | totally different than |
| Answer» B. totally different than | |
| 31. |
Rotary displacement pumps are suitable for handling ________. |
| A. | oils |
| B. | gritty liquids |
| C. | both oils as well as gritty liquids |
| D. | None of the above |
| Answer» B. gritty liquids | |
| 32. |
Meridonial velocity is the resultant of _____________ components of fluid velocity. |
| A. | radial and tangential |
| B. | tangential and axial |
| C. | radial and axial |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 33. |
In which type of turbine, the runner needs to be run full of water? |
| A. | Impulse turbine |
| B. | Reaction turbine |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 34. |
In which type of reaction turbine does the water flow in radial direction at the outer periphery of runner and leave at the centre in the direction parallel to the axis of rotation of runner? |
| A. | Radial flow turbine |
| B. | Axial flow turbine |
| C. | Mixed flow turbine |
| D. | All of the above |
| Answer» D. All of the above | |
| 35. |
In reaction turbine work is done_______________. |
| A. | totally due to change in kinetic energy of jet |
| B. | totally due to change in pressure head |
| C. | mostly due to change in pressure head and small amount of work is due to change in kinetic energy |
| D. | mostly due to change in kinetic energy and small amount of work is due to change in pressure head |
| Answer» D. mostly due to change in kinetic energy and small amount of work is due to change in pressure head | |
| 36. |
How is the variation of air velocity while passing through impeller followed by diffuser in centrifugal compressor? |
| A. | Air velocity goes no increasing in impeller followed by diffuser |
| B. | Air velocity goes no decreasing in impeller followed by diffuser |
| C. | Air velocity increases in impeller and then decreases in diffuser |
| D. | Air velocity decreases in impeller and then increases in diffuser |
| Answer» D. Air velocity decreases in impeller and then increases in diffuser | |
| 37. |
Gross head is the difference between __________. |
| A. | head race and tail race |
| B. | head race and net head |
| C. | head race and friction losses |
| D. | net head and friction losses |
| Answer» B. head race and net head | |
| 38. |
Generally, the value of specific speed of Kaplan turbine is _____________ that of the Pelton turbine. |
| A. | lower than |
| B. | higher than |
| C. | same as |
| D. | unpredictable |
| Answer» C. same as | |
| 39. |
_______________ components of fluid velocity have the responsibility of the transportation of fluid through the machine. |
| A. | Radial and tangential |
| B. | Tangential and axial |
| C. | Radial and axial |
| D. | None of the existing |
| Answer» D. None of the existing | |
| 40. |
___________ can be defined as the ratio of the pressure rise in rotor blades to the pressure rise in stages in an axial flow compressor. |
| A. | Degree of pressure |
| B. | Degree of reaction |
| C. | Pressure ratio |
| D. | Reaction ratio |
| Answer» C. Pressure ratio | |
| 41. |
________ blades are attached to the rotor or spindle. |
| A. | Fixed |
| B. | Moving |
| C. | Both fixed and moving |
| D. | None of the above |
| Answer» C. Both fixed and moving | |
| 42. |
As the reaction turbine works on the principle of impulse and reaction, it follows the law of ________. |
| A. | impulse momentum |
| B. | angular momentum |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 43. |
Angular momentum of gas in the free vortex of vaneless diffuser ___________. |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | becomes unpredictable |
| Answer» D. becomes unpredictable | |
| 44. |
An axial flow compressors have _______. |
| A. | a drum type rotor |
| B. | a disc type rotor |
| C. | a drum type rotor or a disc type rotor |
| D. | none of the above |
| Answer» D. none of the above | |
| 45. |
A pair of fixed blade and rotor blade in axial flow compressor is called as _________. |
| A. | step |
| B. | pair |
| C. | stage |
| D. | state |
| Answer» D. state | |