Fluid Mechanics

171.Equivalent length of a pipe fitting is

1. Dependent on Reynolds number
2. Independent of Reynolds number
3. Dependent on the length of the pipe
4. None of these

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172.Erosion and pits formation on the impeller of a centrifugal pump may be due to

1. Cavitation
2. Low speed of impeller
3. Its operation with delivery valve closed for considerable time after starting the pump
4. Off centering of pump with motor

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173.Euler's equation of motion is a statement expressing

1. Conservation of mass
2. Conservation of energy
3. Newton's first law of motion
4. Newton's second law of motion

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174.Euler's equation of motion states, that at every point, the

1. Fluid momentum is constant
2. Force per unit mass equals acceleration
3. Rate of mass outflow is equal to the rate of mass inflow
4. None of these

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175.Existence of boundary layer in fluid flow is because of the

1. Surface tension
2. Fluid density
3. Fluid viscosity
4. Gravity forces

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176.Experimental study of laminar fluid flow through a circular tube was conducted by

1. Reynolds
2. Hagen and Poiseuille
3. Pascal
4. Blake-Plummer

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177.f = 16/N_Re, is valid for

1. Turbulent flow
2. Laminar flow through an open channel
3. Steady flow
4. None of these

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178.Fanning equation is given by (ΔP/ρ) = 4f (L/D) (v²/2g_c). It is applicable to _________ region flow.

1. Transition
2. Laminar
3. Turbulent
4. Both (B) and (C)

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179.Fanning friction factor equation applies to the _________ fluid flow.

1. Non-isothermal condition of
2. Compressible
3. Both (A) and (B)
4. Neither (A) nor (B)

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180.Fanning friction factor for laminar flow of fluid in a circular pipe is

1. Not a function of the roughness of pipe wall
2. Inversely proportional to Reynolds number
3. Both (A) & (B)
4. Neither (A) nor (B)

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