Fluid Mechanics

251.Hydraulic mean depth (D_m) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at D_m = 0.3 D, gives the condition for the maximum

1. Flow rate
2. Mean velocity
3. Both 'a' & 'b'
4. Neither 'a' nor 'b'

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252.Hydraulic mean radius for flow through packed bed of spherical particle of size, 'D_p, with porosity 'ε' is

1. (D_p/6) (ε/1- ε)
2. (D_p/6) (1- ε/ε)
3. ⅔D_p (1- ε/ε)
4. ⅔D_p (ε/1- ε)

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253.Hydraulic radius is the ratio of

1. Wetted perimeter to flow area
2. Flow area to wetted perimeter
3. Flow area to square of wetted perimeter
4. Square root of flow area to wetted perimeter

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254.Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of

1. Powder & granular solids
2. Liquids
3. Low melting point semi-solids
4. All 'a', 'b' & 'c'

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255.I.D. of 1/4" schedule 40 pipe is 0.364". I.D. of a 1/2" schedule 40 pipe would be _________ inch

1. 4.728
2. 0.5
3. 0.622
4. 0.474

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256.Identification of pipelines carrying different liquids and gases is done by the _________ of the pipe.

1. Diameter
2. Colour
3. Altitude
4. None of these

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257.If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to

1. x
2. x/2
3. x/3
4. 2x/3

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258.If Blasius or Darcy friction factor is 'f1' then the Fanning friction factor is equal to

1. f₁/4
2. 4f₂
3. 2f₁
4. f/2

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259.If in a flow field, between any two points, then the flow must be

1. Steady, incompressible, irrotational
2. Steady, compressible, irrotational
3. Steady, compressible and along a streamline
4. Unsteady, incompressible, irrotational

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260.If more than two branches of pipes are to be connected at the same point, then use a/an

1. Elbow
2. Union
3. Tee
4. None of these

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