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August 2017.pdf-Q1) a) A 7.5 cm diameter

August_2017.pdf-Q1) a) A 7.5 cm diameter

August 2017.pdf-Q1) a) A 7.5 cm dia...

August_2017.pdf-Q1) a) A 7.5 cm diameter

##### Page 1

Q1)

a)

A 7.5 cm diameter jet having velocity of 12 m/s impinges on a smooth

plate at an angle of 60°,to the normal to the plate. What will be the force

when (I) the plate is stationary and (II) when the plate is moving in the

direction of jet at 6 m/s. Determine also the work done per second on the

plate in each case.

[6]

b)

Derive the expression for the force exerted by a jet of water on an inclined

fixed plate in the direction of jet.

[4]

OR

Q2)

a)

Derive the expression of work done per sec for symmetrical moving

curved vane with tangential entry of jet.

[4]

b)

A circular jet of water having velocity of 60 m/s impinges tangentially on

a series of curved vanes moving uniformly at 25 m/s. The jet makes an

angle of 30 degrees with the direction of motion of the vanes. Relative to

a vane, the jet turns through an angle of 100 degrees as it flows over the

vane. The flow speed along the vane drops by 15% due to frictional

loss. Draw neat inlet and outlet velocity triangles showing all the relevant

details and determine:

[6]

i)

Vane tip angles at inlet and outlet for the smooth flow,

ii)

Absolute velocity of water leaving the vanes.

Total No. of Questions :6]

[Total No. of Pages : 2

T.E./Insem.-609

T.E.(Mechanical) (Semester - I)

TURBO MACHINES

(2015 Pattern)

Time : 1 Hour]

[Max. Marks :30

Instructions to the candidates:

1)

Answer Q.1 or Q.2, Q.3 or Q.4 & Q.5 or Q.6.

2)

Figures to the right indicate full marks.

3)

Use of scientific calculator is allowed.

4)

Assume data wherever necessary and mention it.

5)

Draw neat and suitable figures wherever necessary.

P5060

SEAT No. :

P.T.O.

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CEGP013091

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CEGP013091

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##### Page 2

2

T.E./Insem.-609

Q3)

a)

S

ketch Pelton wheel bucket giving its approximate dimensions and answer

question in brief: The ideal jet deflection angle is 180 degree, however bucket

deflects the jet through 160 to 165 degree.

[4]

b)

A Pelton wheel of 2.5 m diameter operates under the following conditions:

Net available head = 300m; Speed = 300r.p.m.; Blade angle at

outlet = l65°; C

V

of nozzle = 0.98; Mechanical Efficiency = 95%.

Determine: i) The Power developed ii) Specific speed iii) Hydraulic

Efficiency.

[6]

OR

Q4)

a)

Define

1) Gross head 2) Jet ratio 3) Hydraulic efficiency 4) Mechanical Efficiency.

[4]

b)

Show that the maximum efficiency of the Pelton wheel is given by

(1+k cos

f

)/2 where K= Bucket friction factor,

F

= Bucket outlet angle.

[6]

Q5)

a)

Compare Francis turbine & Kaplan turbine.

[4]

b)

Design a Francis turbine runner with the following data.

Net Head = 68 m ; Speed=750RPM Power output =

330 kW; Hydraulic

efficiency = 94 %; Overall Efficiency = 85%; Flow ratio = 0.15: Ratio of

breadth to diameter = 0.1; Inner diameter of the runner is half of outer

diameter of the runner. 6% of circumferential area of the runner is

occupied by the thickness of the vanes. Assume velocity of flow remains

constant and flow is radial at exit.

[6]

OR

Q6)

a)

In an inward flow reaction turbine the head on the turbine is 32 m. The

external and internal diameters are 1.44 m and 0.72 m. The velocity of

flow through the runner is constant and equal to 3 m/s. The guide blade

angle is 10 degree and the runner vanes are radial at inlet. If the discharge

at outlet is radial. Determine:

[6]

i)

The speed of the turbine

ii)

The vane angle at outlet of the runner and

iii)

Hydraulic efficiency.

b)

What is the significance of specific speed? Derive the relation for the

same.

[4]

mmm

CEGP013091

49.248.216.238 11/08/2017 11:06:26 SERVER36

CEGP013091

49.248.216.238 11/08/2017 11:06:26 SERVER36

CEGP013091

49.248.216.238 11/08/2017 11:06:26 SERVER36

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