Fluid Mechanics

661.When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an

1. Ejector
2. Blower
3. Injector
4. Airlift

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662.When the momentum of one fluid is used for moving another fluid, such a device is called a/an

1. Jet pump
2. Blower
3. Acid egg
4. None of these

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663.When the pipe Reynold's number is 6000, the flow is generally

1. Viscous
2. Laminar
3. Turbulent
4. Transition

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664.When the water is warm, the height to which it can be lifted by a pump

1. Decreases due to reduced viscosity
2. Decreases due to reduced vapour pressure
3. Increases due to increased vapour pressure
4. Decreases due to increased frictional resistance

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665.Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'?

1. At the centre
2. At d/4 from the wall
3. At the wall
4. At d/8 from the wall

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666.Which is not a variable head meter?

1. Venturimeter
2. Pitot tube
3. Rotameter
4. None of these

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667.Which is the correct relationship for a centrifugal pump? (Where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)

1. D = 1840 H^0.5/N
2. D = 1840 N/H^0.5
3. H = 1840 D^0.5/N
4. D = 1840 H/N

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668.Which is the most efficient and best for measuring very small flow rate of gases?

1. Venturimeter
2. Orificemeter
3. Rotameter
4. Flow nozzle

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669.Which law is followed by the velocity distribution in the turbulent boundary layer?

1. Parabolic law
2. Linear law
3. Logarithmic law
4. None of these

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670.Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics?

1. Archimedes principle
2. Newton's second law of motion
3. Hooke's law
4. Newton's third law of motion

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