Fluid Machines QUESTIONS AND ANSWERS

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