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C7121
Dinax708-1%
Find the displacement thickness, momentum thickness, and energy thickness
for the velocity distribution in the boundary layer given by = — where u is

the velocity at a distance y from the plate and u = U, at y =d, where ©
equals boundary layer thickness. Also calculate the value of 6 */0
What are the methods of controlling the boundary layer?
What is Venturimeter? Derive an expression for the discharge through the
Venturimeter.
An oil of sp. gr. 0.8 is flowing through a venturimeter having inlet diameter 20cm
and throat diameter 10cm. The oil — mercury differential manometer shows a
reading of 25cm. calculate the discharge of oil through the horizontal
Venturimeter. Take Cd = 0.98.
PART C

Answer any four questions, each carries 10 marks.
Find an expression for the efficiency of a series of moving curved vanes when a jet
of water strikes the vanes at one of its tips and show that the maximum efficiency
is 50%.

Water is flowing through a pipe at the end of which a nozzle is fitted. The
diameter of the nozzle is 100mm and the head of water at the centre nozzle is
100m. Find the force exerted by the jet of water on a fixed vertical plate. The co-
efficient of velocity is given as 0.95.
What is governing of turbines? With neat sketch explain the governing of impulse
turbine.
Two jet strikes the buckets of a Pelton wheel, which is having shaft power as
15450kw. The diameter of each jet is given as 200mm.if the net head on the
turbine is 400m, find the overall efficiency of the turbine. Take C, = 1.0
Define specific speed of a turbine. Derive an expression for the same.
Efficiencies of turbine

i) hydraulic efficiency ii) mechanical efficiency

iii) volumetric efficiency iv) overall efficiency
The diameter of an impeller of a centrifugal pump at inlet and outlet are 30cm and
60cm respectively. Determine the minimum starting speed of the pump if it works
against a head of 30cm.
A single acting reciprocating pump, running at 50 r.p.m delivers 0.01m?/s of
water. The diameter of the piston is 200mm and stock length 400mm. determine :

i) The theoretical discharge of the pump. __ ii) Co-efficient of discharge
iii) Slip and percentage slip of the pump.

Define ideal indicator diagram. Show that area of indicator diagram is
proportional to the work done by the reciprocating pump.
Define slip, percentage slip and negative slip of a reciprocating pump.
With neat sketch explain the constructional features of a single-stage centrifugal
pump.

Draw and explain the characteristic curves of a centrifugal pump.
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