Fluid Mechanics and Hydraulic Machines (3141906) MCQs

MCQs of Flow through pipes

Showing 21 to 28 out of 28 Questions
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21.
Minor losses do not make any serious effect in
(a) short pipes
(b) long pipes
(c) both the short as well as long pipes
(d) cannot say
Answer:

Option (b)

22.
Minor losses occur due to
(a) sudden enlargement in the pipe
(b) sudden contraction in the pipe
(c) bends in pipe
(d) all of the above
Answer:

Option (d)

23.
What is the effect of change in Reynold's number on friction factor in turbulent flow?
(a) As Reynold's number increases the friction factor increases in turbulent flow
(b) As Reynold's number increases the friction factor decreases in turbulent flow
(c) Change in Reynold's number does not affect the friction factor in turbulent flow
(d) unpredictable
Answer:

Option (b)

24.
The friction factor in fluid flowing through a pipe depends upon
(a) Reynold's number
(b) relative roughness of pipe surface
(c) both a. and b.
(d) none of the above
Answer:

Option (c)

25.
The head loss through fluid flowing in the pipe due to friction is
(a) the minor loss
(b) the major loss
(c) both a. and b.
(d) none of the above
Answer:

Option (b)

26.
The hammer blow in pipes occurs when
(a) there is excessive leakage in the pipe
(b) the pipe bursts under high pressure of fluid
(c) the flow of fluid through the pipe is suddenly brought to rest by the closing of the valve
(d) the flow of fluid through the pipe is gradually brought to rest by closing of the valve
Answer:

Option (c)

27.
What is the Darcy-Weisbach formula for head loss due to friction? Where, f = Darcy's coefficient of friction
(a) fLV2gd
(b) fLV22gd
(c) 4fLV22gd
(d) 16fLV22gd
Answer:

Option (c)

28.
What is the formula for determining the size of equivalent pipe for two pipes of lengths L1, L2 and diameters d1, d2 respectively? Where L=L1+L2
(a) Ld==L1d1+L2d2
(b) Ld2==L1d12+L2d22
(c) Ld3==L1d13+L2d23
(d) Ld5==L1d15+L2d25
Answer:

Option (d)

Showing 21 to 28 out of 28 Questions
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