MCQs Question of Hydraulic Machine : Download for Free

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1. The hydraulic efficiency of an impulse turbine is the ?

a. Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

b. Ratio of the actual work available at the turbine to the energy imparted to the wheel

c. Ratio of the work done on the wheel to the energy of the jet

d. None of the above

2. A Pelton wheel is ?

a. Tangential flow impulse turbine

b. Inward flow impulse turbine

c. Outward flow impulse turbine

d. Inward flow reaction turbine

3. The undershot water wheels are those in which ?

a. The wheel runs entirely by the weight of water

b. The wheel runs entirely by the impulse of water

c. The wheel runs partly by the weight of water and partly by the impulse of water

d. None of the above

4. The hydraulic efficiency of an impulse turbine is maximum when the velocity of the wheel is ……… of the jet velocity ?

a. One-fourth

b. One-half

c. Three-fourth

d. Double

5. Which of the following is not an Impulse Turbine?

a. Girad turbine

b. Turgo turbine

c. Pelton wheel

d. Kaplan turbine 

6. In a reaction turbine, the draft tube is used ?

a. to run the turbine full

b. to prevent air to enter the turbine

c. to increase the head of water by an amount equal to the height of the runner outlet above the tail race

d. to transport water downstream

7. In a Kaplan turbine runner, the number of blades is generally between?

a. 2 to 4

b.4 to 8

c. 8 to 16

d. 16 to 24

8. The runaway speed of a hydraulic turbine is the speed ?

a. At full load

b. At which there will be no damage to the runner

c. Corresponding to the maximum overload permissible

d. At which the turbine will run freely without load

9. The flow ratio of the Francis turbine is defined as the ratio of the ?

a. Velocity of flow at the inlet to the theoretical jet velocity

b. Theoretical velocity of the jet to the velocity of flow at the inlet

c. Velocity of the runner at the inlet to the velocity of flow at the inlet

d. None of the above

10. Which of the following statement is correct ?

a. In an impulse turbine, the water impinges on the buckets with pressure energy

b. In a reaction turbine, the water glides over the moving vanes with kinetic energy

c. In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure

d. In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes

This was for the MCQs Question of Hydraulic Machine.

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