Fluid Mechanics

651.What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition?

1. 0.5
2. 0.67
3. 1
4. 2

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652.What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)?

1. 0.5
2. 1
3. 1.5
4. 2

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653.What is the shear rate at the pipe wall, in case of laminar flow of Newtonian fluids in a pipe of diameter 'D' & length 'L' incurring a pressure drop 'Δp' with average velocity 'V_avg'?

1. D Δp/8L
2. D Δp/4L
3. 8 V_avg/D
4. 4 V_avg/D

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654.What is the speed of sound (m/sec) in ordinary water?

1. 1500
2. 330
3. 1000
4. 3000

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655.What is the unit of kinematic viscosity in SI unit?

1. m²/sec
2. N/m². sec
3. Kg. sec/m
4. None of these

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656.What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5)?

1. 0.61 - 0.63
2. 0.5 - 0.75
3. 0.75 - 0.90
4. 0.35 - 0.55

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657.What is the value of Fanning friction factor f ' for smooth pipe at N_Re = 10⁶ approximately?

1. 0.003
2. 0.01
3. 0.1
4. 0.3

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658.What type of motion the fluid element undergoes, when it changes from one position to another position, such that the angle between the two sides changes?

1. Rotation
2. Translation
3. Linear deformation
4. Angular deformation

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659.When a fluid flows over a solid surface, the

1. Velocity is uniform at any cross-section
2. Velocity gradient is zero at the solid surface
3. Resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves
4. Velocity is not zero at the solid surface

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660.When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the _________ bed.

1. Spouted
2. Sluggish
3. Boiling
4. Teeter

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