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Which of the following statement(s) is/are incorrect? (i) A turbine is called an impulse turbine if at the inlet of the turbine total energy is only kinetic energy (ii) A turbine is called a reaction turbine if at the inlet of the turbine the total energy is kinetic energy and pressure energy (iii) The inward flow reaction turbine having radial discharge at the outlet is known as Kaplan turbine

Which of the following statement(s) is/are incorrect? (i) A turbine is called an impulse turbine if at the inlet of the turbine total energy is only kinetic energy (ii) A turbine is called a reaction turbine if at the inlet of the turbine the total energy is kinetic energy and pressure energy (iii) The inward flow reaction turbine having radial discharge at the outlet is known as Kaplan turbine Correct Answer Only (iii)

Explanation:

Turbines are classified into two categories according to the type of energy available at inlet which are A. Impulse Turbines and B. Reaction Turbines.

Impulse Turbines:

  • At the inlet of the turbine, the only type of energy available is kinetic energy.
  • As the water flows over the vane, the pressure of the flowing water from inlet to outlet remains unchanged and is equal to the atmospheric pressure.

Reaction Turbines:

  • At the inlet of the turbine, water possesses kinetic energy as well as pressure energy. So, the water impinges the bucket with both kinetic and pressure energy.
  • As the water flows through the runner, the pressure of the flowing water from inlet to outlet does not remain unchanged. The pressure energy goes on changing and gradually converts into kinetic energy.

Classification of turbines on various basis is given in the table below:

Flow

Energy

Head

Example

Tangential

Impulse

High

(300 m and above)

Pelton Wheel turbine

Radial

Reaction

Medium

(30 m to 300 m)

Francis turbine

Axial

Reaction

Low

(less than 30 m)

 

Propeller turbine

Kaplan turbine

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