500 Best Hydraulics MCQ

Q9). The time required to close a valve gradually is (where is the length of pipe and = velocity of pressure wave)

a).2L/C
b).≤2L/C
c).>2L/C
d).<4L/C

Correct Answer:
>2L/C
Explanation:



Q10). A syphon is used

a).to connect water reservoirs at different levels intervened by a hill
b).to supply water to a town from higher level to lower level
c).to fill up a tank with water at higher level from a lower level
d).none of these.

Correct Answer:
to connect water reservoirs at different levels intervened by a hill
Explanation:



Q11). Most economical section of a circular channel for maximum discharge

a).depth of water = 0.95 diameter of circular section
b).hydraulic mean depth = 0.286 diameter of circular section
c).wetted perimeter = 2.6 diameter of circular section
d).All of the above

Correct Answer:
0
Explanation:



Q12). Unit of kinematic viscosity is

a).m2/sec
b).Newton sec/m2
c).Newton sec/m3
d).Kg sec/m2.

Correct Answer:
m2/sec
Explanation:



Q13). The ratio of maximum velocity to average velocity of viscous fluid through a circular pipe is

a).0.5
b).0.75
c).1.25
d).2

Correct Answer:
2
Explanation:



Q14). The shear stress distribution in viscous fluid through a circular pipe is :

a).maximum at the centre
b).maximum at the inside of surface
c).same throughout the section
d).none of these.

Correct Answer:
same throughout the section
Explanation:



Q15). The side slope of Cipolletti weir is generally kept

a).1 to 4
b).1 to 3
c).1 to 2
d). 1:5

Correct Answer:
1 to 4
Explanation:



Q16). The momentum correction factor (β) for the viscous flow through a circular pipe is

a).1.25
b).1.33
c).1.5
d).1.66

Correct Answer:
1.33
Explanation:



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