Fluid Mechanics - Chemical Engineering Questions and Answers

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The equation relating friction factor to Reynold number, f^-0.5 = 4 log_e (N_Re/f)^-0.4, is called the __________ equation.

Nikuradse

Von-Karman

Blausius

Colebrook

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Pressure drop for turbulent fluid flow through a circular pipe is given by

64/R_e

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What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta ?

0.64

1.65

0.32

0.94

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For an unstable equilibrium of a floating body (where, M = metacentre.)

M is above G

M is below G

M & G coincide

none of these

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Which of the following can be used for the direct measurement of volumetric flow rate of slurry ?

Venturimeter

Orificemeter

Rotameter

Pitot tube

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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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A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is

14.1

56.22

28.2

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Delivery of insufficient quantity of liquid by a pump may be caused by

air leak in the inlet

low rpm

too high a lift

all (a), (b) and (c)

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Fluid resistance to shear depends upon its

rate of transfer of molecular momentum.

cohesion.

both (a) and (b).

neither (a) nor (b).