Fluid Mechanics

451.Stoke's law is valid, when the particle Reynolds number is

1. < 1
2. > 1
3. < 5
4. None of these

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452.Surge tanks are provided in high pressure water pipelines to

1. Store a definite quantity of water all the time
2. Reduce the water hammer
3. Facilitate easy dismantling of pipeline for cleaning and maintenance
4. None of these

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453.Terminal velocity is

1. A constant velocity with no acceleration
2. A fluctuating velocity
3. Attained after moving one-half of total distance
4. None of these

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454.The _________ is measured by a piezometric opening.

1. Dynamic pressure
2. Static pressure
3. Total pressure
4. Point velocity

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455.The _________ pressure is measured by a static tube.

1. Dynamic
2. Static
3. Total
4. None of these

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456.The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by

1. Cv . √(2gH)
2. Cc . √(2gH)
3. Cd . √(2gH)
4. Cv . Va

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457.The blades of a centrifugal impeller are said to be curved forward, if the _________ of the motion of impeller blades.

1. Inlet tip of a blade curves in a direction opposite to that
2. Outlet tip of a blade curves in a direction opposite to that
3. Inlet tip of a blade is towards the direction
4. Outlet tip of a blade is towards the direction

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458.The boundary layer is that part of a moving fluid, in which the fluid velocity is

1. Affected by the fluid flow pressure
2. Constant
3. Affected by the presence of a solid boundary
4. All (A), (B) and (C)

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459.The boundary layer thickness at a given section along a flat plate _________ with increasing Reynold's number.

1. Increases
2. Decreases
3. Remain same
4. May increase or decrease

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460.The bulk modulus of elasticity of a liquid

1. Is zero for incompressible liquid
2. Decreases with pressure
3. Is independent of temperature & pressure
4. Increases with pressure

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