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# GATE 2023 FLUID MECHANICS 21

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Question 1

A control volume is ________.

Question 2

In a laminar Poiseuille flow between two parallel plates, the ratio of average velocity to the maximum velocity is:

Question 3

In a laminar flow in a circular pipe, the head loss due to friction is directly proportional to

Question 4

Two fixed horizontal parallel plates are spaced 1 cm apart. A viscous liquid (μ = 0.4 Ns/m2, SG = 0.9) Flows between the plates with a mean velocity of 0.15 m/s. The flow is laminar. The pressure per meter length in the direction of flow is _______ (k Pa/m).

Question 5

For a fully developed laminar flow of water (dynamic viscosity 0.003 Pa-sec) through a pipe of radius 80 mm. The axial pressure gradient is– 13 Pa/m. The magnitude of axial velocity (in m/sec) at a radial location 0.2cm is ____ (up to two decimal places)

Question 6

Cost of the pumping will be in the ratio of x:The cost of pumping the same fluid at some volumetric rate through a 200mm diameter and 250mm diameter pipe has the same roughness k = 0.3mm, assuming Reynold's no. to very high. Find the value of x.
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