Scheme – E

Sample Question Paper Course Name : Mechanical and Production Engineering/Production Technology

Course Code : ME/PT/PG/MH/MI

Semester : Fourth

Subject Title : Fluid Mechanics & Machinery

Max Marks : 100 Time: 3 Hrs.

Instructions:

1. All questions are compulsory.

2. Figures to the right indicate full marks.

3. Draw neat, labeled diagrams wherever necessary.

4. Assume required data, if not provided, stating your assumptions.

Q.1 (a) Attempt any SIX of the following. 12 Marks

a) Define Specific gravity and Specific weight. State its SI unit.

b) Define the terms “Center of pressure” and “Total pressure” on immersed body.

c) Define “laminar flow” and “turbulent flow”.

d) What are the major and minor losses in pipe.

e) Define the term impact of jet.

f) State different types of draft tubes for reaction turbines

g) List the various losses in Centrifugal pump.

h) Define separation in Reciprocating pump.

Q.1 (b) Attempt any Two of the following. 08 Marks

a) With the help a neat labeled sketch, explain in brief the functioning of “volute

casing” of a centrifugal pump.

b) Draw a neat sketch of “inverted U-tube differential manometer”. Under what

pressure conditions it can be used?

c) Determine the specific gravity of fluid having viscosity 0.05 poise and kinematic

viscosity as 0.035 stokes.

12093

Q.2 Attempt any FOUR of the following 16 Marks

a) State any four reasons for the fault “no liquid delivered” in fault finding of

centrifugal pump? Suggest probable remedies also.

b) A jet of water of 5 cm diameter with a velocity of 12 m/s strikes a fixed curved

vane at an angle of 35° and the jet leaves the vane at an angle of 20°. If there no

frictional losses, find the normal and tangential forces of the jet on the vane.

c) Identify all losses of arrangement shown in the fig-1 and give their appropriate formulae.

d) Draw a neat ketch for impact of jet on a moving vertical flat plate and write the

formula to determine the work done with the meaning of each term.

e) A 5mm diameter glass tube is immersed vertically in water. If the contact angle is

50˚ find the capillary rise. Take surface tension for water as 0.074.

f) An Equilateral triangular plate of base 3m and altitude 3m is immersed vertically

in an oil of specific gravity 0.8. Determine total pressure and depth of center of

pressure of plate.

Q.3 Attempt any FOUR of the following. 16 Marks

a) A close tank contains 0.5 m Hg and 1.5 m water, 2m of oil of specific gravity

0.8and air space above the oil, if the pressure at the bottom of tank is 30 N/cm2

gauge. What should be the reading of the gauge at the top of the tank?

b) Draw a neat sketch of venturimeter. State why the length of divergent cone is

made longer?

c) Distinguish between impulse turbine and reaction turbine on the basis of principle

of working, pressure head, discharge and application.

d) A jet of water of 0.05 m diameter with a velocity of 15 m/s impinges on a series of

vanes moving with a velocity of 6 m/s.

Find i) Force exerted by the jet,

Velocity=V1 Velocity=V2

d1 d2

ℓ2

ℓ1

ii) Work done by the jet,

iii) Kinetic energy of the jet and

iv) Efficiency of the jet.

e) Find the head loss due to friction in pipe of diameter 30 cm and length 50 m

through which water is flowing at velocity3m/sec use Darcy’s formula. Take

kinematic viscosity as 0.01stokes.

f) Explain the concept of Absolute pressure, Gauge pressure and atmospheric

pressure.

Q.4 Attempt any TWO of the following. 16 Marks

a) A Pelton wheel operates under a head of 300 m with a speed ratio of 0.5. The

buckets are bent backwards by 30°. Determine the power developed per unit

weight of water flow.

b) Draw the indicator diagram considering both acceleration head and friction head

for reciprocating pump.

c) Water at a head of 300 m is supplied to a pipe of diameter 40 cm and length 4m.

Assume f = 0.009. Calculate the following.

i. Power transmitted when velocity is 1.5 m/s.

ii. Maximum power transmitted.

iii. Power transmitted when velocity is 3.2 m/s.

iv. Draw the graph power transmitted v/s velocity.

Q.5 Attempt any TWO of the following. 16 Marks

a) List the Mechanical gauges for pressure measurement. Explain with a neat sketch

the working of Bourdons tube pressure gauge.

b) A 5m long tapered pipe is inclined at an angle of 15° with horizontal. Diameter of

the pipe at top end is 0.24 m and that at bottom end is 0.08 m. find the pressure

difference between the two ends if the velocity of water at bottom end is 2 m/s.

c) With the help of neat sketch explain the construction and working of Kaplan

Turbine.

Q.6 Attempt any TWO of the following. 16 Marks

a) An Orifice meter with orifice diameter 15 cm is inserted in a pipe of 30cm

diameter. The pressure gauge fitted upstream and downstream of the orifice meter

give readings of 14.715 N/cm2

and 9.81 N/cm2

respectively. Find the rate of flow

of water through the pipe in litres / sec. Take Cd = 0.6.

b) Explain the construction and working of double acting reciprocating Pump with

the help of neat sketch. Why the reciprocating pump is called as the Positive

displacement pump.

c) A centrifugal pump having impeller diameters 0.3 m and 0.6 m at inlet and outlet

respectively is running at 1000 rpm. The vanes are curved back at an angle of 30°

at outlet. If the velocity of flow through the impeller is 3 m/s constant.

Find i) Vane angle at inlet and

ii) Work done per kg of water on the wheel.