Fluid Mechanics

601.The velocity for subsonic flow in a pipeline

1. Increases in the downstream direction
2. Is constant
3. Decreases in the downstream direction
4. Is independent of the area of flow

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602.The velocity profile exhibited by laminar flow of Newtonian fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an _________ with the apex at the centre line of the pipe.

1. Hyperbola
2. Parabola
3. Semi-circle
4. Semi-ellipse

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603.The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is

1. Parabolic
2. Flat
3. Flat near the wall and parabolic in the middle
4. Parabolic near the wall and flat in the middle

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604.The velocity profile for turbulent flow through a closed conduit is

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

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605.The vent valve provided in a liquid handling centrifugal pump is

1. Generally a needle valve
2. Used to release any gases that might be vapour locking the pump
3. Helpful in easy removal of samples
4. All (A), (B) and (C)

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606.Theoretical head developed by a centrifugal pump does not depend upon the _________ the impeller.

1. Radius of
2. Speed of
3. Fluid velocity leaving
4. None of these

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607.To handle smaller quantity of fluid at higher discharge pressure, use a _________ pump.

1. Reciprocating
2. Centrifugal
3. Volute
4. Rotary vacuum

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608.Toothpaste is a

1. Bingham plastic
2. Pseudo-plastic
3. Newtonian liquid
4. Dilatent

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609.Transition from laminar flow to turbulent flow is aided by the

1. Surface roughness and curvature (i.e. sharp corners)
2. Vibration
3. Pressure gradient and the compressibility of the flowing medium
4. All (A), (B) & (C)

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610.Transition length for a turbulent fluid entering into a pipe is around _________ times the pipe diameter.

1. 5
2. 50
3. 500
4. 5000

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