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QUESTION: 1

Two reservoirs at different levels are connected by two parallel pipes of diameter '2d' and 'd'. The ratio of the flows in the two pipes (larger: smaller) is

Solution:

⇒ Q_{1}/Q_{2} = 4/1

QUESTION: 2

A 15 cm diameter pipe carries a flow of 70 L/s of an oil (RD = 0.75). At a section 12 cm above the datum the pressure is vacuum of 2 cm of mercury, if the kinetic energy correction factor a for this section is 1.1, the total head at the section in metres of oil is

Solution:

Total head = + ρ/y + z (here p is negative).

QUESTION: 3

The loss of head due to friction in a pipe of uniform diameter in which viscous flow is taking place is

where R_{e} = flow Reynold’s number

Solution:

QUESTION: 4

In the Moody diagram the third parameter is k_{s}/D. Here k_{s} is

Solution:

QUESTION: 5

A compound pipe of diameters d_{1}, d_{2} and d_{3} having length l_{1}, l_{2} and l_{3} respectively, is to be replaced by an equivalent pipe of uniform diameter d and length l. The size of the equivalent pipe is given by

Solution:

For pipes in series equivalent pipe is given by:

For pipes in parallel equivalent pipe is given by

QUESTION: 6

In a pipe flow, the shear velocity u**.** is related to the Darcy-Weisbach friction factor f as u**./**V =

Solution:

friction factor,

QUESTION: 7

Two pipe systems are said to be equivalent when

Solution:

QUESTION: 8

An oil of kinematic viscosity 0.25 stokes flows, through a pipe of diameter 10 cm. The flow is critical., at a velocity of

Solution:

R_{e }= 2000 = VD/v

2000 = ⇒ V = 0.5 m/sec

QUESTION: 9

Which one of the following phenomena in a pipe flow is termed as water hammer?

Solution:

QUESTION: 10

The pressure at the summit of a syphon is

Solution:

The centre line of pipe is well above the hydraulic grade line and therefore the pressure is negative or below atmospheric.

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