MCQOPTIONS
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MCQOPTIONS
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Power Plant knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is __________ |
| A. | high speed with radial flow at outlet |
| B. | slow speed with radial flow at outlet |
| C. | medium speed with radial flow at outlet |
| D. | high speed with axial flow at outlet |
| Answer» E. | |
| 2. |
In a reaction turbine, the draft tube is used __________ |
| A. | to increase the head of water by an amount equal to the height of the runner outlet above the tail race |
| B. | to transport water to downstream |
| C. | to run the turbine full |
| D. | to prevent air to enter the turbine |
| Answer» B. to transport water to downstream | |
| 3. |
What is the formula for the velocity of water jet at the inlet of turbine?Where,H = Net head acting on Pelton wheelCv = coefficient of velocity of jet |
| A. | V = Cv((gH)(1/2)) |
| B. | V = 2Cv((gH)(1/2)) |
| C. | V = Cv((2gH)(1/2)) |
| D. | V = 2Cv((gH)(1/2)) |
| Answer» D. V = 2Cv((gH)(1/2)) | |
| 4. |
What is runaway speed of the runner of Pelton wheel? |
| A. | maximum unsafe speed of the runner due to sudden increase in load on turbine |
| B. | minimum safe speed of the runner due to sudden increase in load on turbine |
| C. | maximum unsafe speed of the runner due to sudden decrease in load on turbine |
| D. | minimum safe speed of the runner due to sudden decrease in load on turbine |
| Answer» D. minimum safe speed of the runner due to sudden decrease in load on turbine | |
| 5. |
Which of the following hydraulic turbines has a construction given in diagram below? |
| A. | Kaplan turbine |
| B. | Francis turbine |
| C. | Pelton turbine |
| D. | Propeller turbine |
| Answer» D. Propeller turbine | |
| 6. |
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 | |
| 7. |
The runner of __________ turbine always be under pressure of above atmospheric pressure. |
| A. | Turgo |
| B. | Girand |
| C. | Kaplan |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 8. |
For centrifugal pump impeller, what is the maximum value of the vane exit angle? |
| A. | 100 to 150 |
| B. | 150 to 200 |
| C. | 200 to 250 |
| D. | 250 to 300 |
| Answer» D. 250 to 300 | |
| 9. |
What_is_runaway_speed_of_the_runner_of_Pelton_wheel?$ |
| A. | maximum unsafe speed of the runner due to sudden increase in load on turbine |
| B. | minimum safe speed of the runner due to sudden increase in load on turbine |
| C. | maximum unsafe speed of the runner due to sudden decrease in load on turbine |
| D. | minimum safe speed of the runner due to sudden decrease in load on turbine |
| Answer» D. minimum safe speed of the runner due to sudden decrease in load on turbine | |
| 10. |
Which of the following pump is preferred for flood control and irrigation applications? |
| A. | Reciprocating pump |
| B. | Axial flow pump |
| C. | Mixed flow pump |
| D. | Centrifugal pump |
| Answer» C. Mixed flow pump | |
| 11. |
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is |
| A. | high speed with radial flow at outlet |
| B. | slow speed with radial flow at outlet |
| C. | medium speed with radial flow at outlet |
| D. | high speed with axial flow at outlet |
| Answer» E. | |
| 12. |
In a reaction turbine, the draft tube is used |
| A. | to increase the head of water by an amount equal to the height of the runner outlet above the tail race |
| B. | to transport water to downstream |
| C. | to run the turbine full |
| D. | to prevent air to enter the turbine |
| Answer» B. to transport water to downstream | |
| 13. |
Power required to drive a centrifugal pump is directly proportional to __________ of its impeller. |
| A. | cube of diameter |
| B. | fourth power of diameter |
| C. | diameter |
| D. | square of diameter |
| Answer» C. diameter | |
| 14. |
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 | |
| 15. |
What is the head of water available at turbine inlet in hydro-electric power plant called? |
| A. | head race |
| B. | tail race |
| C. | gross head |
| D. | net head |
| Answer» E. | |
| 16. |
The runner of __________ turbine always be under pressure of above atmospheric pressure |
| A. | Turgo |
| B. | Girand |
| C. | Kaplan |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 17. |
Which of the following is an example of impulse turbine? |
| A. | Propeller turbine |
| B. | Francis turbine |
| C. | Kaplan turbine |
| D. | Pelton wheel |
| Answer» E. | |
| 18. |
The energy of water entering the reaction turbine is _______ |
| A. | fully the kinetic energy |
| B. | fully the pressure energy |
| C. | partly the pressure energy and partly the kinetic energy |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 19. |
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 mentioned |
| Answer» B. Reaction turbine | |
| 20. |
In which turbine the pressure energy of water is first converted into kinetic energy by means of nozzle kept close to the runner? |
| A. | Impulse turbine |
| B. | Reaction turbine |
| C. | Both a and b |
| D. | None of the mentioned |
| Answer» B. Reaction turbine | |
| 21. |
For centrifugal pump impeller, the maximum value of the vane exit angle is |
| A. | 100 to 150 |
| B. | 150 to 200 |
| C. | 200 to 250 |
| D. | 250 to 300 |
| Answer» D. 250 to 300 | |