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May Jun 2017.pdf-Total No. of Questions :12] [5153...

May_Jun_2017.pdf-Total No. of Questions :12] [5153]

May Jun 2017.pdf-Total No. of Quest...

May_Jun_2017.pdf-Total No. of Questions :12] [5153]

##### Page 1

Total No. of Questions :12]

[5153] - 505

T.E. (Civil)

FLUID MECHANICS - II

(2012 Pattern) (Semester - I) (End - Sem.)

Time

:

2½ Hours]

[Max. Marks :70

Instructions to the candidates:

1)

Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8, Q.9 or Q.10, Q.11 or Q.12.

2)

Figures to the right indicate full marks.

3)

Assume suitable data if necessary.

P2540

[Total No. of Pages :3

SEAT No. :

Q1)

a)

A circular disc of diameter 3 m is positioned normal to the direction of

flow of wind at 24 m/s. If the coefficient of drag of the disc is 1.06, find

the force required to hold it at rest.

[3]

b)

What are the factors that influence the total drag on the body?

[3]

OR

Q2)

Water is flowing through an elastic pipe of diameter 45 cm, thickness 5 mm

and length 3500 m with a

velocity of 2.2 m/s. A valve is provided at the end of

the pipe. If the valve is suddenly closed, find the rise in pressure. Assume the

Poissons ratio as 0.25, the bulk modulus of water as 2 ×10

9

N/m

2

and the

modulus of elasticity of pipe material 2 × 10

9

N/m

2

.

[6]

Q3)

Derive the Chezys formula for uniform flow in an open channel. List the

factors that affect the Chezys coefficient.

[6]

OR

Q4)

Explain in detail - specific energy diagram with neat sketch.

[6]

P.T.O.

CEGP013091

14.141.39.234 09/05/2017 13:43:02 SERVER36

CEGP013091

14.141.39.234 09/05/2017 13:43:02 SERVER36

CEGP013091

14.141.39.234 09/05/2017 13:43:02 SERVER36

##### Page 2

[5153] - 505

2

Q5)

a)

A hydraulic jump occurs

in a wide rectangular channel. the discharge is

13 m

3

/s and the prejump depth of flow is 0. 55 m. Find the postjump

depth of flow.

[3]

b)

Define:

[3]

i)

normal depth

ii)

conveyance

iii)

section factor

OR

Q6)

Determine the efficient section of a trapezoidal channel designed to carry 4.5

m

3

/s

of water. The side slopes of the channel are 1 horizontal to 3 vertical and

the bed slope of the channel is 1 in 2000. Determine the optimum dimensions

of the channel. Assume mannings coefficient n = 0.03.

[6]

Q7)

a)

A jet of water having a velocity of 25 m/s impinging on a curved vane

which is moving in the same direction as that of the jet with a velocity of

8 m/s. The jet makes an angle of 20

o

with the direction of motion of vane

at entry and leaves the vane at an angle of 120

o

. if the water enters and

leaves the vane without shock, find the vane angles at inlet and outlet.

Also, find the work done per second per unti weight of water striking the

vane. Neglect friction.

[10]

b)

Explain the

following terms related to a centrifugal pump:

[8]

i)

Minimum starting speed

ii)

Hydraulic losses

iii)

Cavitation

iv)

N.P.S.H.

OR

CEGP013091

14.141.39.234 09/05/2017 13:43:02 SERVER36

CEGP013091

14.141.39.234 09/05/2017 13:43:02 SERVER36

CEGP013091

14.141.39.234 09/05/2017 13:43:02 SERVER36

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