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Civil Engineering Objective Questions { Hydraulics }



106. For the flow of liquid from an open ended tube (or nozzle) leading to the formation of spray of liquid drops, the number generally applied, is
A. Froude number
B. Weber number
C. Reynold number
D. Mach number.

107.  If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of the channels is made by comparing
A. Reynold number
B. Froude number
C. Weber number
D. Mach number.

108. The following is not a laminar flow
A. Flow of oil in measuring instruments
B. Flow in beds in ground water
C. Rise of water in plants through roots
D. Flow in water pipe lines.

109. The value of kinetic energy correction factor (a) for a laminar flow through a circular pipe, is
A.0.5
B.1
C.1.5
D.2

110.  The value of momentum correction factor (3) for a laminar flow through a circular pipe, is
A. 1/2
B. 2/3
C. 3/4
D. 4/3

111. The ratio of frictional factor and coefficient of friction used in general equation for a head loss in a pipe, is
A.1
B.b) 2
C.3
D.4

112. If the Mach number for a fluid flow is less than 1, the flow is
A. sonic
B. supersonic
C. sub-sonic
D. none of these.

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