The GATE Grind

GATE 2017 ME (ME2) – Question 23

Fluid Mechanics · Viscous flow, boundary layer and elementary turbulent flow · 1 mark · Multiple choice

Which statement is true?

  1. Both Pelton and Francis turbines are impulse turbines.
  2. Francis is a reaction turbine but Kaplan is an impulse turbine.
  3. Francis is an axial-flow reaction turbine.
  4. Kaplan is an axial-flow reaction turbine.

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Show answer and explanation

Correct answer: (D) Kaplan is an axial-flow reaction turbine.

Explanation

Kaplan is an axial-flow reaction turbine, so **D** is correct. Pelton is impulse; Francis is reaction with mixed flow. Classifying Kaplan as impulse or Francis as purely axial would therefore be incorrect.