Download AKTU B-Tech 4th Sem 2016-17 NCE403 Hydraulics And Hydraulic Machines Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 4th Semester (Fourth Semester) 2016-17 NCE403 Hydraulics And Hydraulic Machines Question Paper

Printed Pagesz2 RollN0.I I I I I I I I I I I NCE403
B.TECH.
THEORY EXAMINATION (SEM?IV) 2016-17
HYDRAULICS AND HYDRAULIC MACHINES
T ime : 3 Hours Max. Marks : 100
Note .' Be precise in your answer. In case ofnumericalproblem assume data wherever not provided.
SECTION ? A
1. Explain the following: 10 x 2 = 20
(a) What do you understand by uniform and non-uniform ?ow in the case of channels?
(b) State and discuss the assumptions made in the derivation of the dynamic equation for
gradually varied ?ow.
(c) Write down the manning?s equation for uniform ?ow in open channel.
(d) Brie?y explain in gradually varied ?ow.
(e) Write down the dynamic equation for gradually varied ?ow in wide rectangular
channel.
(1) Discuss the characteristics of surface profiles.
(g) Explain the working principles of reciprocating pump.
(h) Explain the functions of air vessels in a reciprocating pump.
(i) What are the uses of a draft tube?
(j) Describe the surge tank and a forebay and what are their functions?
SECTION ? B
2. Attempt any ?ve of the following questions: 5 x 10 = 50
(a) A trapezoidal channel with a base width of 6m and side slopes of 2horizontal to 1
vertical conveys water at 17m3/s with a depth of 1.5m.is the ?ow situation sub or super
critical.
(b) State the conditions under which the rectangular section of an open channel will be
most economical. Derive these conditions.
(c) At what height from water surface a centrifugal pump may be installed in the following
case to avoid cavitation; atmospheric pressure 101kpa;vapour pressure 2.34kpa;in1et
and other losses in suction pipe 1.55m;effective head of pump 52.5m;and cavitation
parameter 6 =0.118.
(d) Show that the maximum inertia head in a reciprocating pump without air vessel is given
by
ca ?3 CL
(e) What is Chezy?s formula? How is it derived?
(1) Show that for a trapezoidal channel of given area of ?ow, the condition of maximum
?ow requires that hydraulic mean depth is equal to one half the depth of ?ow.
(g) A rectangular channel 10m wide is laid with a break in its bottom slope from 0.01 to
0.0064. If it carries 125m3/s, determine the nature of the surface pro?le and compute its
length. Take n=0.015.
(h) Explain with neat a sketch, the construction details and working principles of a
centrifugal pump.
SECTION ? C
Attempt any two of the following questions: 2 x 15 = 30

(a) A trapezoidal channel has a bottom width of 6m and side slopes of 1:1.the depth of
?ow is 1.5m at a discharge of 15m3/s.determine the specific energy. If the critical depth
is 0.9m, discuss the type of ?ow corresponding to the critical depth.
(b) For a hydraulic jump in a horizontal triangular channel show that
?554? ._ x1055? ?3
YQ-q
Where;
Fr?? ?_ 611/33.)
Y : (ga/n.)
(a) A horizontal rectangular channel 4m wide carries a discharge of 16m3/s.Determine
whether a jump may occur at an initial depth of 0.5m or not. If a jump occurs,
determine the sequent depth to this initial depth. Also determine the energy loss in the
jump.
(b) Design a pelton wheel which is required to develop1500kW, when working under a
head of 160m at a speed of 420rpm.the overall efficiency may be taken as 85% and
assume other data required.
An inward ?ow reaction turbine is required to develop 300kW at 200rpm.the active head at the
turbine is 18m.determine the outside and inside diameters, the inlet and exit angles for the
vanes and the exit angle for the guide vanes. Assume the inlet diameter equal to twice the
outlet diameter, the hydraulic ef?ciency as 80%, the constant radial velocity of ?ow of 3.6m3/s
through the runner, the mechanical ef?ciency as 95% and the width ratio as .10, water leaves
the runner radially.