The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which “sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis”. The centre of pressure of a rectangular surface (of width ‘w’) immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid)?

Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as________?

Air is best heated with steam in a heat exchanger of________?

Which of the following is a dimensionless parameter?

Reforming________?

Percentage of U-238 in natural uranium is around________?