Test: Flow Through Pipes - 2 | 10 Questions MCQ Test Topicwise Question Bank for Civil Engineering Civil Engineering (CE)

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

A.
√2 : 1
B.
2 : 1
C.
4 : 1
D.
4√2 : 1

Solution:

⇒ Q₁/Q₂ = 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

A.
0.648
B.
0.728
C.
0.557
D.
0.637

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

A.
11R_e
B.
4/R_e
C.
16/R_e
D.
64/R_e

Solution:

QUESTION: 4

In the Moody diagram the third parameter is k_s/D. Here k_s is

A.
the equivalent uniform sand grain roughness
B.
an arbitrarily chosen roughness magnitude
C.
median size in a nonuniform sand grain roughness
D.
mean height of the actual roughness of commercial pipes

Solution:

QUESTION: 5

A compound pipe of diameters d₁, d₂ and d₃ having length l₁, l₂ and l₃ 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

A.
B.
C.
D.

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 =

A.
B.
C.
D.

Solution:

friction factor,

QUESTION: 7

Two pipe systems are said to be equivalent when

A.
head loss and discharge are same in two systems
B.
length of pipe and discharge are same in two systems
C.
friction factor and length are same in two systems
D.
length and diameter are same in two systems

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

A.
7.2 m/s
B.
5.0 m/s
C.
0.5 m/s
D.
0.72 m/s

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?

A.
The sudden rise of pressure in a long pipe due to sudden closure of valve.
B.
The rise of a pressure in a pipe flow due to gradual closure of vajve.
C.
The rise of negative pressure.
D.
The zero pressure in a pipe flow.

Solution:

QUESTION: 10

The pressure at the summit of a syphon is

A.
equal to atmospheric
B.
less than atmospheric
C.
more than atmospheric
D.
None of the above

Solution:

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

Test: Flow Through Pipes - 2

10 Questions MCQ Test Topicwise Question Bank for Civil Engineering | Test: Flow Through Pipes - 2

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

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

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

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