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Mr. Dubey • 52.30K Points
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Q. Which of the following profiles are used for guide vanes to ensure smooth flow without separation?

(A) rectangular
(B) bent rectangular
(C) elliptical
(D) aerofoil
Correct : Option (D)

Explanation: 
 smooth flow and flow without separation (eddiless flow) can be ensured when the cross sectional profile of the guide vanes are aerofoil in nature. aerofoil shape is used in airplane wings to ensure smooth flow too. rectangular profiles are not effective in guiding the water into the runner. elliptical profiles will cause more drag, finally ending up with turbine inefficiency.

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