GATE ME 2015 Set 3 — Question 62
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Turbomachinery → Hydraulic Turbines & Pumps → Cavitation & NPSH
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Question
Which of the following statements are TRUE, when the cavitation parameter ?
(i) the local pressure is reduced to vapor pressure
(ii) cavitation starts
(iii) boiling of liquid starts
(iv) cavitation stops
(i) the local pressure is reduced to vapor pressure
(ii) cavitation starts
(iii) boiling of liquid starts
(iv) cavitation stops
Correct answer
(D) (i), (ii) and (iii)
Solution
The cavitation parameter is defined as:where is the local pressure and is the vapor pressure of the liquid at the given temperature.
When , it implies , or .
When , it implies , or .
- Statement (i): The local pressure is reduced to vapor pressure. This is TRUE.
- Statement (ii): Cavitation starts when the local pressure drops to the vapor pressure. This is TRUE.
- Statement (iii): Boiling of the liquid starts at the vapor pressure for a given temperature. This is TRUE.
- Statement (iv): Cavitation starts, not stops, at this condition. This is FALSE.
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