Fluid Mechanics Question Paper of 3rd Semester Civil(D) Download Previous Years Question Paper 5

S.B. Roll No. _____________

FLUID MECHANICES

3rd Exam/Mech/5381/Dec’07

Duration : 4 Hrs.

Section A

1.      Choose the correct answer:

a.     Dynamic viscosity (µ) has the dimensions as

                                                             i.      MLT^-2

                                                           ii.      ML^-1T^-1

                                                        iii.      ML^-1T^-2

                                                        iv.      M^-1L^-1T^-1

b.     Pascal’s law states the pressure at a point is equal in all directions

                                                             i.      In a liquid at rest

                                                           ii.      In a fluid at rest

                                                        iii.      In a laminar flow

                                                        iv.      In a turbulent flow

c.      Bernoulli’s theorem deals with law of conservation of

                                                             i.      Mass

                                                           ii.      Momentum

                                                        iii.      Energy

                                                        iv.      None of these

d.     An ideal fluid is defined as the fluid which

                                                             i.      Is compressible

                                                           ii.      Is incompressible

                                                        iii.      Has negligible surface tension

                                                        iv.      Is incompressible and non-viscous

2.     State true or false

a.     Surface tension has the unit of force per unit area.

b.     Atmospheric pressure held in water column is 9.81

c.      Pitot tube is used for measurement of velocity at a point.

d.     Reciprocating pumps are positive displacement pumps.

e.      The gases are considered compressible when mach No is less than 0.2

3.     Fill in the blanks

a.     Poise is the unit of _______

b.     Continuity equation deals with the law of conservation of _________

c.      A peloton wheel is a _________ head turbine

d.     A turbine is called impulse turbine if total energy at the inlet to turbine is ________

e.      Bar is the unit of ________

Section –B

4.                 Attempt any five questions

a)     Differentiate between viscosity and  kinematic viscosity? State their unit of measurement  pressure?

b)     What  do you mean by single column manometers? How are they used for measurement of pressure?

c)     Differentiate between

a.     Steady and unsteady flow

b.     Uniform and non-uniform flow

d)     Discuss the factors influencing the loss f energy due to friction

e)     Discuss the construction and working of hydraulic accumulator.

f)      Explain construction and working of gear pump.

g)     Explain how a venturimeter can be used to measure discharge.

Section –C

Note : Attempt any two questions

5.       

a.     Calculate the density, specific weight of 5 litre of petrol of specific gravity 0.75

b.     An orifice meter with orifice diameter 100mm is inserted in a pipe of 200mm diameter. The pressure gauges fitted upstream and downstream of the orifice meter fives reading of 19.62 N/cm2 and N/cm2 respectively. Coefficient of discharge for the meter is given as 0.6 find the discharge of water through pipe.

6.     A horizontal pipe of diameter 500mm is suddenly contracted to a diameter of 250 mm. The pressure intensities in the and smaller pipe is given as 13.734 N/cm2 and 11.772 N/cm2 respectively. Find the loss of head of  due to contraction if CC =0.62 also determine the rate of flow of water.

7.      

8.      Give brief description and working of the followings.

a.     Reciprocating pumps

b.     Kaplan turbine