Fluid Mechanics - Chemical Engineering Questions and Answers

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Mercury is an ideal barometric fluid mainly due to its

High density

Low compressibility

Low capillary action

Very low vapor pressure

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

Parabolic

Flat

Flat near the wall and parabolic in the middle

Parabolic near the wall and flat in the middle

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A streamline is a line in flow field,

That is traced by all the fluid particles passing through a given point

Along which a fluid particle travels

Such that at every point on it, the velocity is tangential to it

None of these

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Hot wire anemometer is used to measure the

Velocity of liquids

Temperature of liquids

Velocity of gases

Pressure of liquids

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A pipe is defined as 'hydraulically smooth', if the friction factor

Is not a function of Reynolds number

For a given Reynolds number remains constant even on further smoothening of the pipe

Is zero irrespective of the Reynolds number

None of these

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Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type.

Axial

Radial

Mixed

None of these

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With increase in pump speed, its NPSH requirement

Decreases

Increases

Remains unaltered

Can either increase or decrease ; depends on other factors

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In a/an __________ , the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure.

Rotameter

Pitot tube

Venturimeter

Flow nozzle

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In a stabilised soap bubble, pressure inside it compared to external pressure is

Less

Same

Unpredictable