36.  Hydraulic mean radius for flow through packed bed of spherical particle of size, 'Dₚ', with porosity 'ε' is 
a.  A 
b.  B 
c.  C 
d.  D 
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Answer: (a).A

37.  A conical tank with a bottom opening of crosssectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking ? Assume that the density of air is negligible as compared to the density of water ρL. 
a.  ρL . Vg 
b.  ρL . A.Hg 
c.  ρL . Vg/2 
d.  ρL .Vg/3 
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Answer: (b).ρL . A.Hg

38.  The equivalent diameter for pressure drop calculation for a duct of square crosssection is given by(where, x = each side of the square duct) 
a.  A 
b.  B 
c.  C 
d.  D 
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Answer: (a).A

39.  Each term of the Bernoulli's equation written in the following form, represents the total energy per unit 
a.  mass 
b.  volume 
c.  specific weight 
d.  none of these 
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Answer: (a).mass

40.  For one dimensional flow of an incompressible fluid in unsteady state in xdirection, the continuity equation is given by 
a.  A 
b.  B 
c.  C 
d.  D 
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Answer: (a).A
