Question

Define critical velocity regarding erosion-corrosion.

(a) Velocity at which erosion-corrosion starts

(b) Velocity at which erosion-corrosion stops

(c) Velocity after which erosion-corrosion increases exponentially

(d) Velocity after which erosion-corrosion decreases exponentially

I got this question during an internship interview.

The origin of the question is Eight Forms topic in section Eight Forms of Corrosion of Corrosion Engineering

Answer 1

Correct answer is (c) Velocity after which erosion-corrosion increases exponentially

The explanation is: Critical velocity is the velocity after which the erosion-corrosion increases exponentially. Case 1 (velocity less than critical velocity):

Erosion corrosion increases linearly with increase with velocity.

Case 2 (velocity greater than critical velocity):

Erosion corrosion increases exponentially with increase with velocity.