Fluid Mechanics free Model online Test2

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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