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Consider the following statements: 1. In an Impulse turbine, the pressure of the flowing water remains un- changed and is equal to atmospheric Pressure. 2. In Impulse turbines, the water impinges on the buckets with ‘Pressure energy’. 3. In a Reaction turbine, the pressure of the flowing water remains un- changed and is equal to atmospheric pressure. Which of the above statements is/are correct?

Consider the following statements: 1. In an Impulse turbine, the pressure of the flowing water remains un- changed and is equal to atmospheric Pressure. 2. In Impulse turbines, the water impinges on the buckets with ‘Pressure energy’. 3. In a Reaction turbine, the pressure of the flowing water remains un- changed and is equal to atmospheric pressure. Which of the above statements is/are correct? Correct Answer 1 only

Concept:

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.


∴ Statement 1 is correct.

Reaction Turbines:

  • At the inlet of the turbine, water possesses the kinetic energy as well as pressure energy. So, the water impinges the bucket with both kinetic and pressure energy.


∴ Statement 2 is incorrect.

  • 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.


∴ Statement 3 is incorrect.

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