Flow Through Pipes - 2


10 Questions MCQ Test Mock Test Series for Civil Engineering (CE) GATE 2020 | Flow Through Pipes - 2


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This mock test of Flow Through Pipes - 2 for GATE helps you for every GATE entrance exam. This contains 10 Multiple Choice Questions for GATE Flow Through Pipes - 2 (mcq) to study with solutions a complete question bank. The solved questions answers in this Flow Through Pipes - 2 quiz give you a good mix of easy questions and tough questions. GATE students definitely take this Flow Through Pipes - 2 exercise for a better result in the exam. You can find other Flow Through Pipes - 2 extra questions, long questions & short questions for GATE on EduRev as well by searching above.
QUESTION: 1

Three identical pipes of length L, diameter D and friction factor f, are connected in parallel between two reservoirs. The size of a pipe of length L and of same friction factor f, equivalent to the above pipes, is

Solution:

Equivalent pipe for the pipes in parallel:


or 
or  De = 1.5518 D

QUESTION: 2

A pipe of diameter D is to be replaced by n pipe each of diameter of laid in parallel. The value of d is given by 

Solution:


or D5 = n2d5
or D = n2/5 D
∴ d = (D/n2/5)

QUESTION: 3

At a sudden expansion in a horizontal pipe

Solution:
QUESTION: 4

In a pipeline, the H.G.L is above the pipe center line in the longitudinal section at point A and below the pipe center line at another point B.
From this it can be inferred that

Solution:
QUESTION: 5

In network of pipes

Solution:
QUESTION: 6

Consider the following statements:
1. Pipe network analysis is normally necessary in analyzing flow in pipes at city water systems,
2. Hardy-cross method of solving pipe network is a method of successive approximations and is not a direct method.
3. The network must satisfy the momentum equation because the flow in each pipe satisfies the head loss equation.
4. Principle of continuity is satisfied in a pipe network..

Select the correct statments:

Solution:
QUESTION: 7

The diameter of the nozzle (d) for maximum transmission of power is given by
Where
D = Diameter of pipe
f = Darcy’s friction factor
l = Length of pipe

Solution:

For maximum power transmission through nozzle:
Nozzle diameter


A = area of supply pipe
a = area of Nozzle

QUESTION: 8

Maximum efficiency of transmission of power through a pipe is

Solution:

Efficiency of power transmission is given by 

For maximum efficiency

We get

QUESTION: 9

Power transmitted through a pipe is maximum when
Where
H = total head supplied
HL = head loss due to friction

Solution:

For maximum power transmission

QUESTION: 10

Power transmitted through a pipe is given by
where
w = specific weight of the fluid flowing through pipe
Q = discharge, m3/s

Solution:

Power transmitted through a pipe (When HL is frictional head)
P = wQ(H - HL)

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