Top 1000+ Solved Fluid Mechanics (FM) MCQ Questions Answer

Q. 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

Q. The volumetric efficiency of a given turbine is 80%. If volume flow rate of water ingiven 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

Q. 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

Q. 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

Q. 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

Q. 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

Q. 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

Q. In a Kaplan turbine, what is the direction of water flow?

a. Axial and then axial

b. Radial and then axial

c. Tangential and then axial

d. Tangential and then radial

Q. For which of the following values of available heads may Kaplan turbine be used?

a. 250 m

b. 100 m

c. 80 m

d. 50 m

Q. In this type of low head turbine, the guide vanes are fixed to the hub of the turbine and are not adjustable. What is this type of turbine called?

a. Francis turbine

b. Kaplan Turbine

c. Propeller Turbine

d. Pelton turbine

Q. The velocity of flow through a Kaplan turbine is 10 m/s. The outer diameter of the runner is 4 m and the hub diameter is 2 m. Find the volume flow rate of the turbine in m3/s?

a. 95

b. 75

c. 85

d. 105

Q. The velocity of the flow at the inlet of Kaplan turbine is V. In an experimental setup, what could be the possible value of the velocity of the flow at the outlet of Kaplan turbine?

a. V

b. 0.8V

c. 1.2V

d. 2V

Q. Which of the following turbines will have the lowest number of blades in it?

a. Pelton turbine

b. Steam turbine

c. Francis turbine

d. Kaplan turbine

Q. The velocity of the flow through the Kaplan turbine is 25 m/s. The available head of the turbine is 60 m. Find the flow ratio of the turbine (take g = 10 m/s2).

a. 0.65

b. 0.72

c. 0.69

d. 0.75

Q. A Kaplan turbine requires a speed ratio of 2. The available head of the turbine is 5 m. What should be the blade velocity of the turbine such that a speed ratio of 2 is maintained (take g = 10 m/s2)?

a. 75.75 m/s

b. 63.25 m/s

c. 23.35 m/s

d. 50.00 m/s

Top 1000+ Solved Fluid Mechanics (FM) MCQ Questions Answer

From 451 to 465 of 1033

Q. 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)?

Q. The volumetric efficiency of a given turbine is 80%. If volume flow rate of water ingiven to be 30 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second?

Q. 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 %)?

Q. 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)?

Q. 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)?

Q. 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%.

Q. 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 %)?

Q. In a Kaplan turbine, what is the direction of water flow?

Q. For which of the following values of available heads may Kaplan turbine be used?

Q. In this type of low head turbine, the guide vanes are fixed to the hub of the turbine and are not adjustable. What is this type of turbine called?

Q. The velocity of flow through a Kaplan turbine is 10 m/s. The outer diameter of the runner is 4 m and the hub diameter is 2 m. Find the volume flow rate of the turbine in m3/s?

Q. The velocity of the flow at the inlet of Kaplan turbine is V. In an experimental setup, what could be the possible value of the velocity of the flow at the outlet of Kaplan turbine?

Q. Which of the following turbines will have the lowest number of blades in it?

Q. The velocity of the flow through the Kaplan turbine is 25 m/s. The available head of the turbine is 60 m. Find the flow ratio of the turbine (take g = 10 m/s2).

Q. A Kaplan turbine requires a speed ratio of 2. The available head of the turbine is 5 m. What should be the blade velocity of the turbine such that a speed ratio of 2 is maintained (take g = 10 m/s2)?

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