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Fluid Machines - Interview Questions and Answers

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71. Select the correct statement.
A. The absolute roughness of a pipe de-creases with time.
B. A pipe becomes smooth after using for long time.
C. The friction factor decreases with time.
D. The absolute roughness increases with time.
Explanation:
72. The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is
A. 0.40 cm
B. 0.20 cm
C. 0.10 cm
D. 0.05 cm
Explanation:
73. A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be
A. 1 m
B. 10m
C. 100m
D. none of the above
Explanation:
74. If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be
A. from reservoir A to reservoirs B and C
B. from reservoir B to reservoirs C and A
C. from reservoir C to reservoirs A and B
D. unpredictable
Explanation:
75. The speed of a pressure wave through a pipe depends upon
A. the length of pipe
B. the viscosity of fluid
C. the bulk modulus for the fluid
D. the original head
Explanation:
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