FM & FM OBT -II SY A AY-2022-23 Sem II

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According to Darcy's formula, the loss of head due to friction in the pipeIs  -------  f = coefficient of friction l = length of pipeY == average velocity of liquid in the pipe, and. d = diameter of the pipe

• 4flV²/ 2gd

• flV2/ 2gd

• 4flV/ 2gd

• 4flV2/ gd

For laminar flow in circular pipes, Darcy's friction factor f' is equal To where Re is Reynold's, number

• 16/Re
• 32/Re
• 64/Re
• none of the above

The relation between the coefficient of friction and friction factor

• coefficient of friction = 2 times friction factor
• coefficient of friction = 4 times friction factor
• friction factor = 2 times coefficient of friction
• friction factor = 4 times coefficient of friction

For turbulent flow in a circular pipe, the friction factor f' is equal to

• 0.079 / Re^0.25

• 0.316 / R0.25

• 64/Re

• 0.0025 / R0.25

According to Chezy's formula, the velocityof liquid in a pipe is given by

• V = m √i C

• V = C √i m

• V= AC √i m

• V = m √iC

The Chezy's constant

• is dimensionless
• has the dimension of velocity
• has the dimension of discharge
• has the dimension L1/2 T1

The hydraulic mean depth is defined as

• the square root of the area
• area divided by the welted perimeter
• area divided by the square of welted perimeter
• perimeter divided by area

The hydraulic mean depth for a circularpipe of diameter (d) is

• d / 2
• d / 6
• d / 4
• 2d / 3