Fluid Mechanics and Machinary, Question Paper of B.Tech 4th Semester,Download Previous Years Question Paper 1

Roll No. ......................

Total No. of Questions : 09]

B.Tech. (Sem. – 4th)

FLUID MECHANICS AND MACHINARY

SUBJECT CODE : AE – 206

Paper ID : [A0711]

Time : 03 Hours

Instruction to Candidates:

1) Section - A is Compulsory.

2) Attempt any Four questions from Section - B.

3) Attempt any Two questions from Section - C.

Section - A

Q1)

a) Define specific weight and specific volume along with their units?

 b) Define briefly the phenomena of cavitation?

 c) Show graphically how the bulk modulous of elasticity varies with in-creasing pressure.

 d) Define center of pressure. Why it is different from center of gravity.

 e) Explain the principle of reaction turbine?

 f) Explain the functioning of a pitot tube?

 g) State the formula and importance of mach number?

 h) Give atleast 2 differences between the free vortex flow and forced

vortex flow?

 i) Define water hammer?

 j) Why is mercury a preffered fluid used in manometers and

thermometers?

Section - B

Q2) A rectangular gate is in the vertical side of the reservoir can turn freely about

its upper edge which is horizontal and is fastened at its two lower corners.

The gate is 1 m wide and 2 m high and its upper edge is 2 m below the water

level. Determine the reactions at the lower corners assuming them to be

equal.

Q3) Gasoline flows through a constriction in a horizontal pipe where the diameter

is reduced from 20 cm to 10 cm. The pressure in the 20cm pipe just upstream

of construction is 60kPa. Considering no loss of energy in the flow passage,

make calculations for the maximum discharge that can be passed through the

construction without the occurrence of cavitation. The barometer reads 76cm

of mercury and for the gasoline vapour pressure is 56 KPa (abs) and density

is 650 kg/m3 for the pressure and temperature condition involved.

Q4) How does the viscosity of liquids and gases vary with the rise in temperature?

Explain with reasons.

Q5) Wave motion on the section of a beach is to be studied by means of a geometrically similar model having a length scale ratio of 1 : 10. Neglecting friction and surface tension effects, calculate the velocity ratio, time ratio, acceleration ratio and force ratio between model and prototype. Take

ρ = 1020 kg/m3 for the beach water and ρ = 1000 kg/m3 for the fresh water

used in the model.

Q6) Describe the construction and functioning of any 2 devices for flow measurement?

Section - C

Q7) Derive the Darcy weisbach’s equation for head loss due to friction in circular

pipes?

Q8) A conical diffusing section diverges uniformly from 0.1 m diameter to 0.2 m

diameter over a length of 1 metre. Find the local and convective acceleration

at the middle of the diffuser. Consider the following two cases.

 (a) Rate of flow is 100 litres per second and it remains constant.

(b) Rate of flow varies uniformly from 100 litres/sec to 200 litres/sec in 5

seconds and the time of interest is when t = 2 second. Velocity at any

cross – section, perpendicular to the flow direction, may be assumed to

be uniform.

Q9) Describe in detail the construction and working of centrifugal?