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Test: Kaplan Turbines - Civil Engineering (CE) MCQ


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10 Questions MCQ Test Fluid Mechanics for Civil Engineering - Test: Kaplan Turbines

Test: Kaplan Turbines for Civil Engineering (CE) 2024 is part of Fluid Mechanics for Civil Engineering preparation. The Test: Kaplan Turbines questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Kaplan Turbines MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Kaplan Turbines below.
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Test: Kaplan Turbines - Question 1

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

Detailed Solution for Test: Kaplan Turbines - Question 1

The Kaplan turbine is an axial flow reaction turbine. The water inlet is axial and the water outlet is axial too.

Test: Kaplan Turbines - Question 2

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?

Detailed Solution for Test: Kaplan Turbines - Question 2

In a Kaplan turbine, the guide vanes are adjustable and not fixed to the hub of the turbine. Francis and Pelton turbines are not low head turbines. In a propeller turbine, the guide vanes are fixed to the hub of the turbine.

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Test: Kaplan Turbines - Question 3

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?

Detailed Solution for Test: Kaplan Turbines - Question 3

The flow velocity of turbine at the outlet of the Kaplan turbine will be lesser than that of the inlet due to effects of friction in the blade. Hence, practically a lower value would be obtained. 0.8V is the only option lower than V.

Test: Kaplan Turbines - Question 4

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?

Detailed Solution for Test: Kaplan Turbines - Question 4

cos (β1) = (u – Vw1)/ Vr1. Substituting the given values in the above equation and rearranging to find the value of u, we get 36.124 m/s.

Test: Kaplan Turbines - Question 5

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

Detailed Solution for Test: Kaplan Turbines - Question 5

The Kaplan turbine is said to be a Low head turbine. The low head ranges from 0 to 60 m. Only 50 m falls in this range and hence, it’s the correct option.

Test: Kaplan Turbines - Question 6

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?

Detailed Solution for Test: Kaplan Turbines - Question 6

The volume flow rate is given by

Substituting the given values in the above equation, we get Q = 95 m3/s.

Test: Kaplan Turbines - Question 7

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

Detailed Solution for Test: Kaplan Turbines - Question 7

As the head for Kaplan turbine is low, the discharge of water through the turbine is high and hence, blade resistance should be low. That’s why Kaplan turbine will have the lowest number of blades.

Test: Kaplan Turbines - Question 8

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

Detailed Solution for Test: Kaplan Turbines - Question 8

Considering the velocity diagram of a Kaplan turbine at the inlet for a fast runner, we notice that the whirl velocity is lower the blade velocity along the same direction. They are equal in case of a medium runner.

Test: Kaplan Turbines - Question 9

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?

Detailed Solution for Test: Kaplan Turbines - Question 9

In the inlet velocity triangle, tan (α1) = Vf1/ Vw1o, Vf1 = Vw1 = 10 m/s.

Test: Kaplan Turbines - Question 10

Which is the wrong statement about hydraulic turbine?

Detailed Solution for Test: Kaplan Turbines - Question 10

Hydraulic turbine - 
The main classification depends upon the type of action of the water on the turbine. These are :
(i) Impulse Turbine
(ii) Reaction Turbine. 

(i) Impulse turbine:-

  • In the case of an impulse turbine, all the potential energy is converted to kinetic energy in the nozzles. The impulse provided by the jets is used to turn the turbine wheel. 
  • This type is found suitable when the available potential energy is high and the flow available is comparatively low.
  • The relative velocity over the moving blades either remains constant or slightly decreases so the correct answer is option 1

(ii) Reaction Turbine:-

  • In reaction turbines, the available potential energy is progressively converted in the turbine's rotors and the reaction of the accelerating water causes the turning of the wheel.
  • The relative velocity over the moving blades increases.
  • These are again divided into (a) radial flow, (b) mixed flow, and (c) axial flow machines
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