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ESE CE: Fluid Mechanics Champion Quiz 3
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Question 1
While using Darcy-Weisbach equation for estimating head loss in a pipe flow, the friction factor was misjudged by + 20% for this case, the error in estimating discharge is
Question 2
The If the velocity of flow as well as the diameter of the flowing pipe are respectively doubled through pipe system in use since long, the head loss will thereafter be
Question 3
Statement (I): Gravity is a determinant in estimating pipe flow magnitudes.
Statement (II): The term 'g' appears explicitly in Darcy- weisback formula for pipe flow resistance.
Statement (II): The term 'g' appears explicitly in Darcy- weisback formula for pipe flow resistance.
Question 4
Assertion (A): Total energy line and the hydraulic gradient line for a pipe flow cannot intersect each other.
Reason (R): The vertical differences between these two lines must equal the velocity head.
Reason (R): The vertical differences between these two lines must equal the velocity head.
Question 5
For laminar flow through a round pipe, the shear stress ___________.
Question 6
Oil flows through a 200 mm diameter horizontal cast iron pipe (friction factor, f = 0.0225) of length 500m. The volumetric flow rate is 0.2 m3/s. The head loss (in m) due to friction is (assume g = 9.81 m/s2)
Question 7
Match List-I with List-II and select the correct answer using the code given below the lists.
Question 8
Which of the following pairs are correctly matched?
1) Piezometric head: Sum of datum head and Pressure head
2) Dynamic head: Sum of datum head and velocity head
3) Stagnation head: Sum of Piezometric head and velocity head
4) Total head: Sum of Piezometric head and dynamic head
1) Piezometric head: Sum of datum head and Pressure head
2) Dynamic head: Sum of datum head and velocity head
3) Stagnation head: Sum of Piezometric head and velocity head
4) Total head: Sum of Piezometric head and dynamic head
Question 9
A venturimeter in oil (sp. gr. 0.8) pipe is connected to a differential manometer in which the gauge liquid is mercury (sp. gr. 13.6). For a flow rate of 0.16 m3/s, the manometer registers a gauge differential of 20 cm. The oil-mercury manometer being unavailable, an air-oil differential manometer is connected to the same venturimeter. Neglecting variation of discharge coefficient for the venturimeter, what is the new gauge differential for a flow rate of 0.08 m3/s ____________?
Question 10
A wall shear stress of 40 Pa exists in a laminar flow in a 12 cm diameter pipe. At a distance 2 cm from the wall, what will be the shear stress?
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Nov 4ESE & GATE CE
