Fluid Mechanics

221.For the production of very high vacuum, a _________ pump is normally used.

1. Diffusion
2. Centrifugal
3. Jet ejector
4. Piston

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222.For the same flow rate of a fluid, the pressure drop is the least for

1. Venturimeter
2. Orificemeter
3. Flow-nozzle
4. Δp is same for all

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223.For the same terminal conditions and fitting size, the least friction loss is incurred in a/an

1. T-joint
2. Union
3. 45° elbow
4. 90°bend

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224.For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is

1. More
2. Less
3. Equal
4. Either (A) or (B); depends on the viscosity of the fluid

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225.For the transfer of solution of thick slurry, the pump used is a _________ pump.

1. Reciprocating
2. Gear
3. Diaphragm
4. Centrifugal

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226.For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance 'd' measured from the wall of the pipe and the friction velocity 'v', and it follows a _________ relationship.

1. Logarithmic
2. Linear
3. Hyperbolic
4. Parabolic

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227.For turbulent flow of an incompressible fluid through a pipe, the flow rate „Q‟ is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent 'n' is

1. 1
2. 0
3. < 1
4. > 1

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228.For turbulent flow of Newtonian fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is

1. 0.5
2. 1
3. 0.66
4. < 0.5

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229.For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).

1. V/V_max = (x/r)^1/7
2. V/V_max = (r/x)^1/7
3. V/V_max = (x.r)^1/7
4. None of these

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230.For very low pressure and high discharge rate, the compressor used is a/an _________ compressor.

1. Axial
2. Reciprocating
3. Rotary
4. None of these

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