Chapter:

420+ Turbine Solved MCQs

in Fluid Mechanics (FM)

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .

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251.	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» A. 40

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252.	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» C. 80

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253.	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» D. Mechanical efficiency cannot be found out from the given information

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254.	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» C. 22.5

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255.	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» B. 6

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256.	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» C. 80

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257.	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» A. 2.85

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258.	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» C. 83.3

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259.	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» B. 5.4

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260.	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» B. 85.5

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261.	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
Answer» A. Axial and then axial

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262.	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
Answer» D. 50 m

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263.	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
Answer» A. Francis turbine

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264.	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
Answer» A. 95

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265.	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
Answer» B. 0.8V

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266.	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
Answer» D. Kaplan turbine

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267.	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
Answer» B. 0.72

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268.	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
Answer» B. 63.25 m/s

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269.	The flow ratio of a Kaplan turbine is given as 0.7. The available head is 30 m. The outer diameter of the runner is 3.5 m and the hub diameter is 2 m. Find the volume of water flowing through the turbine per second (m3/s)?
A.	90
B.	111
C.	125
D.	168
Answer» B. 111

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270.	In which of the following type of runners in a Kaplan turbine the velocity of whirl at inlet is smaller than the blade velocity?
A.	Such a case is practically impossible
B.	Slow Runner
C.	Medium Runner
D.	Fast Runner
Answer» D. Fast Runner

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271.	In the outlet velocity triangle of a Kaplan turbine, β2 = 30o. Vf2 = 5 m/s. What is the relative velocity of the flow at outlet?
A.	10 m/s
B.	5.77 m/s
C.	8.66 m/s
D.	2.88 m/s
Answer» A. 10 m/s

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272.	In the inlet velocity triangle of a Kaplan turbine, α1 = 45o. The velocity of flow at inlet = 10 m/s. Find the whirl velocity of water at the inlet of Kaplan turbine?
A.	5 m/s
B.	10 m/s
C.	12.5 m/s
D.	15 m/s
Answer» B. 10 m/s

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273.	The whirl velocity of water at the inlet of the Kaplan turbine is 15 m/s. The velocity of water at inlet of the turbine is 20 m/s. Find the guide vane angle at inlet (In degrees).
A.	53.13
B.	36.86
C.	45
D.	41.41
Answer» D. 41.41

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274.	The relative velocity of water at the inlet of the Kaplan turbine is 7 m/s. β1 = 75o. The whirl velocity of the water at inlet is 10 m/s. Find the blade velocity of the turbine?
A.	26.124 m/s
B.	40 m/s
C.	36.124 m/s
D.	60 m/s
Answer» C. 36.124 m/s

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275.	For the figure given below, find the missing terms in the order of (1), (2), (3) and (4).
A.	Vr1, α1, β1, Vw1
B.	Vw1, β1, α1, Vr1
C.	Vw1, α1, β1, Vr1
D.	Vr1, β1, α1, Vw1
Answer» C. Vw1, α1, β1, Vr1

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276.	Kaplan turbine works on
A.	Electrical energy
B.	Hydro energy
C.	Thermal energy
D.	Chemical energy
Answer» C. Thermal energy

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277.	Kaplan turbine is an reaction turbine
A.	Inward flow
B.	Outward flow
C.	Radial
D.	Axial
Answer» A. Inward flow

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278.	The Kaplan Turbine is an evolution of
A.	Francis turbine
B.	Pelton wheel
C.	Parsons turbine
D.	Curtis turbine
Answer» A. Francis turbine

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279.	What is the dimension of thermal efficiency of a Kaplan turbine?
A.	kg
B.	m
C.	kg/m
D.	Dimensionless
Answer» D. Dimensionless

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280.	A Kaplan turbine is used in
A.	Turbomachinery
B.	Pressure drag
C.	Aerodynamics
D.	Automobiles
Answer» A. Turbomachinery

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281.	The head of the Kaplan ranges from
A.	100 to 200 m
B.	250 to 300 m
C.	10 to 70 m
D.	0 m
Answer» C. 10 to 70 m

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282.	Nozzles in the Kaplan turbine move due to impact of
A.	Water
B.	Steam
C.	Blade
D.	Another nozzle
Answer» B. Steam

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283.	The power output of Kaplan turbine ranges from
A.	5 to 200 MW
B.	1000 to 2000 MW
C.	2000 to 3000 MW
D.	5000 and above
Answer» A. 5 to 200 MW

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284.	Kaplan turbines rotates at a rate
A.	Increasing
B.	Decreasing
C.	Constant
D.	Increasing and then decreasing
Answer» C. Constant

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285.	What type of turbine is Kaplan?
A.	Impulse
B.	Reaction
C.	Energy
D.	Hydro
Answer» B. Reaction

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286.	Kaplan turbine is needed to improve
A.	Increase Pressure
B.	Decrease temperature
C.	Change volume
D.	Increase efficiency
Answer» D. Increase efficiency

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287.	Kaplan turbine is an type turbine
A.	Pressure
B.	Inward flow
C.	Outward flow
D.	Velocity
Answer» B. Inward flow

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288.	The turbine does not have to be at the lowest point of water flow as long as the water in the draft tube is full.
A.	True
B.	False
C.	none
D.	none
Answer» A. True

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289.	The outlet of the Kaplan turbine is through
A.	Vane Blades
B.	Moving pipeline
C.	Draft tube
D.	Pump
Answer» C. Draft tube

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290.	Kaplan turbine is most commonly used in propeller turbines.
A.	True
B.	False
C.	none
D.	none
Answer» A. True

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291.	For a Kaplan turbine, the whirl velocity at inlet of the turbine is given to be 18 m/s. The blade velocity is given as 25 m/s. What is the hydraulic efficiency for a head of 50 m. Take g = 10 m/s2?
A.	80%
B.	90%
C.	70%
D.	98%
Answer» B. 90%

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292.	Which of the following efficiencies for Kaplan 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» A. Hydraulic efficiency

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293.	The desired hydraulic efficiency of a Kaplan turbine is 98% at a whirl velocity of 20 m/s and a head of 60 m. What should be the blade velocity of the turbine at inlet in m/s? Take g = 10 m/s2.
A.	40
B.	60
C.	80
D.	30
Answer» D. 30

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294.	It is given that the input water power of the Kaplan turbine is 1.10 times the runner power. What would be the hydraulic efficiency of the turbine (in %)?
A.	60.61
B.	70.71
C.	80.81
D.	90.91
Answer» D. 90.91

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295.	Which of the following efficiencies for Kaplan 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» B. Volumetric efficiency

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296.	The volume flow rate into a Kaplan turbine is Q m3/s. 0.10Q m3/s volume of water do not flow over the runner blades. What further information is required to find the volumetric efficiency (numerical value) of the Kaplan turbine?
A.	The numerical value of Q
B.	The available head of the turbine
C.	The RPM or the blade velocity of the turbine
D.	No further information is required
Answer» D. No further information is required

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297.	A student reports the volumetric efficiency of a Kaplan turbine to be 95%. If he measures the volume flow rate through the turbine is 40 m3/s. What is the flow rate of water over the runner blades (in m3/s)?
A.	38
B.	40
C.	42.11
D.	45
Answer» A. 38

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298.	95*40 = 38 m3/s. 358. In a Kaplan turbine experiment, the volumetric efficiency of a given turbine is 91%. If volume flow rate of water in given to be 35 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second?
A.	4.05
B.	3.15
C.	3.30
D.	2.55
Answer» B. 3.15

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299.	Which of the following efficiencies for Kaplan 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» C. Mechanical efficiency

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300.	The power available at the shaft of a Kaplan turbine is 0.75 MW. The volume flow rate of water in 15 m3/s, whirl velocity at inlet is 12 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)?
A.	66.66
B.	75.00
C.	83.33
D.	91.33
Answer» C. 83.33

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420+ Turbine Solved MCQs

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?

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 %)?

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 %)?

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)?

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?

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 %)?

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)?

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)?

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%.

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 %)?

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

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

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?

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?

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?

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

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 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)?

The flow ratio of a Kaplan turbine is given as 0.7. The available head is 30 m. The outer diameter of the runner is 3.5 m and the hub diameter is 2 m. Find the volume of water flowing through the turbine per second (m3/s)?

In which of the following type of runners in a Kaplan turbine the velocity of whirl at inlet is smaller than the blade velocity?

In the outlet velocity triangle of a Kaplan turbine, β2 = 30o. Vf2 = 5 m/s. What is the relative velocity of the flow at outlet?

In the inlet velocity triangle of a Kaplan turbine, α1 = 45o. The velocity of flow at inlet = 10 m/s. Find the whirl velocity of water at the inlet of Kaplan turbine?

The whirl velocity of water at the inlet of the Kaplan turbine is 15 m/s. The velocity of water at inlet of the turbine is 20 m/s. Find the guide vane angle at inlet (In degrees).

The relative velocity of water at the inlet of the Kaplan turbine is 7 m/s. β1 = 75o. The whirl velocity of the water at inlet is 10 m/s. Find the blade velocity of the turbine?

For the figure given below, find the missing terms in the order of (1), (2), (3) and (4).

Kaplan turbine works on

Kaplan turbine is an reaction turbine

The Kaplan Turbine is an evolution of

What is the dimension of thermal efficiency of a Kaplan turbine?

A Kaplan turbine is used in

The head of the Kaplan ranges from

Nozzles in the Kaplan turbine move due to impact of

The power output of Kaplan turbine ranges from

Kaplan turbines rotates at a rate

What type of turbine is Kaplan?

Kaplan turbine is needed to improve

Kaplan turbine is an type turbine

The turbine does not have to be at the lowest point of water flow as long as the water in the draft tube is full.

The outlet of the Kaplan turbine is through

Kaplan turbine is most commonly used in propeller turbines.

For a Kaplan turbine, the whirl velocity at inlet of the turbine is given to be 18 m/s. The blade velocity is given as 25 m/s. What is the hydraulic efficiency for a head of 50 m. Take g = 10 m/s2?

Which of the following efficiencies for Kaplan Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet?

The desired hydraulic efficiency of a Kaplan turbine is 98% at a whirl velocity of 20 m/s and a head of 60 m. What should be the blade velocity of the turbine at inlet in m/s? Take g = 10 m/s2.

It is given that the input water power of the Kaplan turbine is 1.10 times the runner power. What would be the hydraulic efficiency of the turbine (in %)?

Which of the following efficiencies for Kaplan Turbine is described as the ratio between total quantity of water over runner blades to total quantity of water supplied to turbine?

The volume flow rate into a Kaplan turbine is Q m3/s. 0.10Q m3/s volume of water do not flow over the runner blades. What further information is required to find the volumetric efficiency (numerical value) of the Kaplan turbine?

A student reports the volumetric efficiency of a Kaplan turbine to be 95%. If he measures the volume flow rate through the turbine is 40 m3/s. What is the flow rate of water over the runner blades (in m3/s)?

95*40 = 38 m3/s. 358. In a Kaplan turbine experiment, the volumetric efficiency of a given turbine is 91%. If volume flow rate of water in given to be 35 m3/s, find the volume of water (m3) NOT flowing over the runner blades per second?

Which of the following efficiencies for Kaplan Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner?

The power available at the shaft of a Kaplan turbine is 0.75 MW. The volume flow rate of water in 15 m3/s, whirl velocity at inlet is 12 m/s and blade velocity is 5 m/s. Find the mechanical efficiency (in %)?