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**Fluid Mechanics Questions **

**Explain the Isotropic and homogeneous turbulence.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**An aeroplane weighing 50 kN is flying in a horizontal direction at 360 km/hr. The plane spans 15 m and has a wing surface are of 35 m2. Determine the Lift coefficient and power required to drive the plane. Assume drag coefficient Cd = 0.03, density = 1.2 kg/ m3 for air.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**A rotational mixing device is constructed with two circular discs each 10 cm in diameter. These discs are spaced 1.2 m apart on the two ends of a horizontal rod whose centre has a vertical shaft attached to it. Estimate the power required for rotating when this mixer turns 60 revolutions per minute having following fluid properties:density = 960 kg/ m3, coeff of viscosity = 0.08075 kg-m/s for 3000< Re < 5000 and Cd = 1.2**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Determine Tube Air speed, stagnation temp. and density at the nose of pitot tube comprising the speed indicator.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Show that discharge per unit width between two parallel plates at a distance b apart, when one plate is moving at velocity V while other held stationary for the condition of zero stress at a fixed plate is Q = b V /3.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**What is drag coefficient? Discuss its importance and on what factors does it depend.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**What size pipe should be installed to carry 5.5 x 10-3 m2/s oil with Kinematic Viscosity v = 6 x 10-6 m2/s under laminar flow conditions.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**A source with strength of 0.26 m2/s and a vortex with a strength of 1 m2/s (anticlockwise) are located at origin. Determine the equation for stream function and velocity potential.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Show that for Laminar flow, the point of maximum instability exists at a distance 2/3rd of pipe radius.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Derive a stream function for a flow to a line source of strength m2/s per meter.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**What is Mach number and its importance?**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**What is difference between friction drag and pressure drag?**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Explain displacement thickness and momentum thickness.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Find the Kinematic Viscosity in stokes of a liquid where specific gravity is 0.95 and Viscosity is 0.11 poise.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**What is Normal Shock and how is it obtained?**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Which of the following functions represents possible irrotational flow? (i)psi = A(x2 - y2) (ii) psi = A sin (pi x/l) + B sin (piy/l) where A, B and l are constants.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Explain Turbulent Flow, Laminar Flow.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Write the momentum equation for compressible fluids in x direction.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Define stream line, streak line, stream tube, path line.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Define and distinguish between uniform and nonuniform flow.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**The jets from a garden sprinkler are 25 mm in diameter and are normal to the 75 cm radius. If the pressure at the base of nozzle is 400 kPa, find the force of jet on the sprinkler. 5, 15**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Can Bernoullis equation be applied to forced vortex flow?**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**How do you account for friction loss when applying Bernoullis equation to real fluid flow? 15,5**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**A jet of water issuing from a sharp edged vertical orifice under a constant head of 10 cm at a certain point, has the horizontal and vertical coordinates measured from the vena contracta as 20 cm and 10.5 cm respectively. Find the value of Cv if Cd = 0.60.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Three pipes of different diameters and different lengths are connected in series to make a compound pipe. The ends of this compound pipe are connected two tanks whose difference of water level is H. If coefficient of friction of these pipes is same, derive the formula for the total head loss neglecting the minor losses.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**How would you distinguish between hydrodynamically smooth and rough boundaries?**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**A pitot tube is used to measure the velocity of water in a pipe. The stagnation pressure head is 6 m and static pressure head is 5 m. Calculate the velocity of flow assuming the coefficient of tube is equal to 0.98.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**The diameters of a pipe at the inlet and outlet are 10 cm and 15 cm respectively. Find the discharge through the pipe if the velocity of water flowing through the pipe at inlet is 5 m/s. Determine also he velocity at outlet.**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**When will centre of pressure and centre of gravity of an immersed plane surface coincide?**

(class:
BE/BTech - Civil
)
Fluid Mechanics

**Develop the expression for relation between gauge pressure p inside a droplet of liquid and the surface tension.**

(class:
BE/BTech - Civil
)
Fluid Mechanics