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.Management Sciences
Category: Fluid Mechanics
The velocity distribution for laminar flow through a circular tube__________________?
A. is constant over the cross-section
B. varies linearly from zero at walls to maximum at centre
C. varies parabolically with maximum at the centre
D. none of the above
The maximum thickness of boundary layer in a pipe of radius r is____________________?
A. 0
B. r/2
C. r
D. 2r
If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will________________?
A. rise until its weight equals the buoyant force
B. tend to move downward and it may finally sink
C. float
D. none of the above
Flow at constant rate through a tapering pipe is________________?
1. steady flow
2. uniform flow
3. unsteady flow
4. non-uniform flow
The correct answer is?
A. (1) and (2)
B. (1)and(iv)
C. (2) and (3)
D. (2) and (4)
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
An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be________________?
A. 4 kN/m2
B. 10 kN/m2
C. 12 kN/m2
D. 14 kN/m2
In case of an airfoil, the separation of flow occurs________________?
A. at the extreme rear of body
B. at the extreme front of body
C. midway between rear and front of body
D. any where between rear and front of body depending upon Reynolds number
Coefficient of velocity for Borda’s mouth piece running full is________________?
A. 0.611
B. 0.707
C. 0.855
D. 1.00
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