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WorksheetsDay 34-Oct 23-worksheet-Diploma-laminar flow through pipes
Total questions: 15
Worksheet time: 8mins
In fully developed laminar flow through a horizontal pipe, head loss varies directly with:
Velocity
Velocity²
1/Velocity
1/Velocity²
For a sudden enlargement, the head loss is mainly due to:
Flow separation and eddies
Wall shear
Pipe friction
Velocity diffusion
TEL and HGL in a real pipeline satisfy:
HGL always above TEL
TEL always above HGL
Both always coincide
TEL horizontal always
Maximum power transmission through a pipe occurs when:
hf = H
hf = 2H/3
hf = H/3
hf → 0
In parallel pipes:
Velocities remain same
Head loss remains same
Discharge remains same
Roughness remains same
Darcy friction factor for laminar flow (f’) =
64/Re
16/Re
0.316/Re⁴
1/Re²
The summit in a siphon is:
Point of max. velocity
Highest elevation point
Lowest energy point
Minimum slope point
Friction factor becomes independent of Re in fully turbulent rough pipe flow.
True
False
The line joining piezometric head values along the flow is called (a) .
The vertical separation between TEL and HGL is the (a) .
An equivalent pipe gives the same discharge and head loss as compound pipes.
True
False
The highest point of a siphon pipe is called the (a) .
A pipe exits water with velocity 10 m/s. The head loss at exit = (a) m
Sudden enlargement from 0.10 m to 0.20 m pipe. If initial velocity = 6 m/s, head loss = (a) m
A pipeline of length 500 m has diameter 0.20 m. It is to be replaced by an equivalent pipe of diameter 0.40 m. Its equivalent length = (a) m
