

MCQOPTIONS
Saved Bookmarks
This section includes 21 Mcqs, each offering curated multiple-choice questions to sharpen your Hydraulic Machines knowledge and support exam preparation. Choose a topic below to get started.
1. |
The volume flow rate of water in 10 m3/s at an available head of 60 m (g = 10 m/s3). Find the shaft power (in MW) if the overall efficiency of the turbine is 90%. |
A. | 54 |
B. | 5.4 |
C. | 540 |
D. | 0.54 |
Answer» C. 540 | |
2. |
The power output of the shaft is 5 MW. The volume flow rate of water in 10 m3/s at an available head of 60 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)? |
A. | 80 |
B. | 82.5 |
C. | 83.3 |
D. | 85 |
Answer» D. 85 | |
3. |
The whirl velocity at inlet is 15 m/s and blade velocity is 10 m/s. The volume flow rate of water in 20 m3/s. Find the power output available at the shaft if the mechanical efficiency is 95% (in MW)? |
A. | 2.85 |
B. | 3.075 |
C. | 6.55 |
D. | 0.285 |
Answer» B. 3.075 | |
4. |
The power available at the shaft of a Francis turbine is 1 MW. The volume flow rate of water in 25 m3/s, whirl velocity at inlet is 10 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)? |
A. | 65 |
B. | 75 |
C. | 80 |
D. | 90 |
Answer» D. 90 | |
5. |
The volumetric efficiency of a given turbine is 80%. If volume flow rate of water in given to be 30 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second? |
A. | 5 |
B. | 6 |
C. | 10 |
D. | 12 |
Answer» C. 10 | |
6. |
The volumetric efficiency of a Francis turbine is given to be 90%. If the volume flow rate through the turbine is 25 m3/s. What is the flow rate of water over the runner blades (in m3/s)? |
A. | 20 |
B. | 25 |
C. | 22.5 |
D. | 21.5 |
Answer» D. 21.5 | |
7. |
THE_VOLUMETRIC_EFFICIENCY_OF_A_FRANCIS_TURBINE_IS_GIVEN_TO_BE_90%._IF_THE_VOLUME_FLOW_RATE_THROUGH_THE_TURBINE_IS_25_M3/S._WHAT_IS_THE_FLOW_RATE_OF_WATER_OVER_THE_RUNNER_BLADES_(IN_M3/S)??$ |
A. | 20 |
B. | 25 |
C. | 22.5 |
D. | 21.5 |
Answer» D. 21.5 | |
8. |
The power available at the shaft of a Francis turbine is 1 MW. The volume flow rate of water in 25 m3/s, whirl velocity at inlet is 10 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)?$ |
A. | 65 |
B. | 75 |
C. | 80 |
D. | 90 |
Answer» D. 90 | |
9. |
The_volumetric_efficiency_of_a_given_turbine_is_80%._If_volume_flow_rate_of_water_in_given_to_be_30_m3/s,_find_the_volume_of_water_(m3)_NOT_flowing_over_the_runner_blades_per_second?$ |
A. | 5 |
B. | 6 |
C. | 10 |
D. | 12 |
Answer» C. 10 | |
10. |
The hydraulic efficiency of a Francis turbine is 90%, the mechanical efficiency is 95% and the volumetric efficiency is assumed to be 100%. Fine the overall efficiency (in %)? |
A. | 80 |
B. | 85.5 |
C. | 87.5 |
D. | 83.3 |
Answer» C. 87.5 | |
11. |
The volume flow rate of water in 10 m3/s at an available head of 60 m (g = 10 m/s3). Find the shaft power (in MW) if the overall efficiency of the turbine is 90%. |
A. | 54 |
B. | 5.4 |
C. | 540 |
D. | 0.54 |
Answer» C. 540 | |
12. |
The power output of the shaft is 5 MW. The volume flow rate of water in 10 m3/s at an available head of 60 m. Find the overall efficiency of the turbine in % (g = 10 m/s2)? |
A. | 80 |
B. | 82.5 |
C. | 83.3 |
D. | 85 |
Answer» D. 85 | |
13. |
The_whirl_velocity_at_inlet_is_15_m/s_and_blade_velocity_is_10_m/s._The_volume_flow_rate_of_water_in_20_m3/s._Find_the_power_output_available_at_the_shaft_if_the_mechanical_efficiency_is_95%_(in_MW)? |
A. | 2.85 |
B. | 3.075 |
C. | 6.55 |
D. | 0.285 |
Answer» B. 3.075 | |
14. |
The volume flow rate into a Francis turbine is Q m3/s. 0.25Q m3/s volume of water do not flow over the runner blades. What is the mechanical efficiency of the turbine (in %)? |
A. | 65 |
B. | 75 |
C. | 80 |
D. | Mechanical efficiency cannot be found out from the given information |
Answer» E. | |
15. |
The input water power of the Francis turbine is 1.25 times the runner power. What would be the hydraulic efficiency of the turbine (in %)? |
A. | 60 |
B. | 70 |
C. | 80 |
D. | 90 |
Answer» D. 90 | |
16. |
The desired hydraulic efficiency of a turbine is 80% at a whirl velocity of 20 m/s and a head of 100 m. What should be the blade velocity of the turbine at inlet in m/s? |
A. | 40 |
B. | 60 |
C. | 80 |
D. | 25 |
Answer» B. 60 | |
17. |
The whirl velocity at inlet of Francis turbine is given to be 20 m/s. The blade velocity is given as 35 m/s. What is the hydraulic efficiency for a head of 100 m? |
A. | 80% |
B. | 90% |
C. | 70% |
D. | 98% |
Answer» D. 98% | |
18. |
Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft to the power supplied by water at the inlet? |
A. | Hydraulic efficiency |
B. | Volumetric efficiency |
C. | Mechanical efficiency |
D. | Overall efficiency |
Answer» E. | |
19. |
Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner? |
A. | Hydraulic efficiency |
B. | Volumetric efficiency |
C. | Mechanical efficiency |
D. | Overall efficiency |
Answer» D. Overall efficiency | |
20. |
Which of the following efficiencies for Francis Turbine is described as the ratio between total quantity of water over runner blades to total quantity of water supplied to turbine? |
A. | Hydraulic efficiency |
B. | Volumetric efficiency |
C. | Mechanical efficiency |
D. | Overall efficiency |
Answer» C. Mechanical efficiency | |
21. |
Which of the following efficiencies for Francis Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet? |
A. | Hydraulic efficiency |
B. | Volumetric efficiency |
C. | Mechanical efficiency |
D. | Overall efficiency |
Answer» B. Volumetric efficiency | |