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Fluid Mechanics free Model online Test2
Fluid Mechanics free Model online Test2
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Test your caliber
1. Size of a venturimeter is specified by _____.
pipe diameter
throat diameter
angle of diverging section
both pipe diameter as well as throat diameter
2. Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by _____.
5%
10%
15%
20%
3. The discharge through a V- notch varies as _____.
H1/2
H3/2
H5/2
H5/4 where H is head
4. Which of the following is an incorrect statement?
Coefficient of contraction of a venturimeter is unity.
Flow nozzle is cheaper than venturimeter but has higher energy loss
Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined.
None of the above statement is correct
5. Coefficient of velocity of venturimeter ____.
is independent of Reynolds number
decreases with higher Reynolds number
is equal to the coefficient of discharge of venturimeter
none of the above
6. The pressure at the summit of a syphon is _____.
equal to atmospheric
less than atmospheric
more than atmospheric
none of the above
7. Ay between two stream lines represents
velocity
discharge
head
pressure
8. Coefficient of velocity for Borda's mouth piece running full is _____.
0.611
0.707
0.855
1.00
9. Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is _____.
slightly less
slightly more
nearly half
equal
10. The major loss of energy in long pipes is due to _____.
sudden enlargement
sudden contraction
gradual contraction or enlargement
friction
11. Coefficient of contraction for an external cylindrical mouthpiece is _____.
1.00
0.855
0.7H
0.611
12. Which of the following has highest coefficient of discharge ?
sharp edged orifice
venturimeter
Borda's mouthpiece running full
CipoUetti weir
13. In a Sutro weir, the discharge is proportional to
H1/2
H3/2
H5/2
H
14. The discharge over a broad crested weir is maximum when the depth of flow is ____.
H/3
H/2
2H/5
2H/3
15. Which of the following statements is correct?
Lower critical Reynolds number is of no practical significance in pipe flow problems.
Upper critical Reynolds number is significant in pipe flow problems.
Lower critical Reynolds number has the value 2000 in pipe flow
Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.
16. For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be _____.
300
337.5
600
675
17. The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is
constant over the cross section
parabolic distribution across the section
zero at the mid plane and varies linearly with distance from mid plane
zero at plates and increases linearly to midpoint
18. Stanton diagram is a ______.
log-log plot of friction factor against Reynolds number
log-log plot of relative roughness against Reynolds number
semi-log plot of friction factor against Reynolds number
semi-log plot of friction factor against relative roughness
19. The depth 'd' below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be _____.
0.423 D
0.577 D
0.223 D
0.707 D
20. The boundary layer thickness in turbulent flow varies as
x/7
x/2
x4/5
x3/5
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