Civil Engineering Questions And Answers :: Fluid Machines: part4



Civil Engineering : Fluid Machines QUESTIONS AND ANSWERS :: part4 : 1 to 5

Following Civil Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

1.Select the correct statement.

The absolute roughness of a pipe de-creases with time.
A pipe becomes smooth after using for long time.
The friction factor decreases with time.
The absolute roughness increases with time.

2.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

0.40 cm
0.20 cm
0.10 cm
0.05 cm

3.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

1 m
10m
100m
none of the above

4.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

from reservoir A to reservoirs B and C
from reservoir B to reservoirs C and A
from reservoir C to reservoirs A and B
unpredictable

5.The speed of a pressure wave through a pipe depends upon

the length of pipe
the viscosity of fluid
the bulk modulus for the fluid
the original head

More Fluid Machines QUESTIONS AND ANSWERS available in next pages

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