## 100 TOP FLUID MECHANICS Interview Questions<—– CLICK HERE

61. Stanton diagram is a

a) log-log plot of friction factor against Reynolds number

b) log-log plot of relative roughness against Reynolds number

c) semi-log plot of friction factor against Reynolds number

d) semi-log plot of friction factor against relative roughness

Ans: a

62. The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be

a) 0.423 D

b) 0.577 D

c) 0.223 D

d) 0.707 D

where D is the depth of flow.

Ans: b

63. The boundary layer thickness in turbulent flow varies as

a) x”7

b) x,/2

c) x4/5

d) x3/5

where x is the distance from leading edge.

Ans: c

64. The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is

a) 0.223 R

b) 0.423 R

c) 0.577 R

d) 0.707 R

where R is radius of pipe.

Ans: a

65. If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is

a) less than 1

b) between 1 and 100

c) 160

d) 200

Ans: c

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