JNTU B.Tech II FLUID MECHANICS AND HYDRAULIC MACHINES Previous Question Paper (December - 2018 - R16)

Explain the difference between simple and differential manometer.

Derive dimensions for Bulk modulus (k) and kinematic viscosity.

What is continuity equation? Give the applications.

What are the practical applications of Bernoulli’s equation?

Explain how laminar and turbulent boundary layers are formed.

What is the significance of the upper and lower critical Reynolds number?

What is Water hammer?

Explain about cavitation in turbines?

What is priming of a centrifugal pump? Why it is needed.

Define slip of reciprocating pump and under what circumstances does the negative slip occur?

A Plate of a certain oil weighs 40KN. Calculate the sp. Wt., mass density and specific gravity of this oil.

Find the pressure inside a water droplet of dia 0.03mm, if the surface tension of water is 0.075N/m.

Find the intensity of pressure at a depth of 2m in a liquid of sp. gr. 0.8.

Explain how vacuum pressure can be measured with the help of a U-tube manometer.

In a mercury differential manometer the mercury deflection is 20 cm. Find the difference of pressure in ‘kpa’ if the liquid flowing in the pipe is oil of sp. gr. 0.8.

Define and distinguish between: (i) uniform flow and non-uniform flow (ii) laminar and turbulent flow.

Explain stream lines, path lines, streak lines and stream tube.

Show the stream lines and equipotential lines intersect each other orthogonally.

The velocity components in a two dimensional flow field for an incompressible fluid are expressed as u = y³ + 2x - x²y; v = xy² - 2y - x³, show that these functions represent a possible case of an irrotational flow.

Explain with sketches the three methods of boundary layer control.

Two water carrying circular pipes are connected in parallel. The length L1, diameter d1, and friction factor f1 for the first pipe are 200m, 0.5m and 0.025m respectively, while L2=100m, d2=1.0m and f2=0.02. What is the velocity ratio V2/V1.

The thickness of the laminar boundary layer on a flat plate at a point A is 2cm and at a point B, 1m down stream of A, is 3cm. What is the distance of A from the leading edge in cm?

Prove that the maximum velocity is twice the average velocity in laminar flow through circular pipe.

Draw the velocity triangle for Pelton wheel, Francis turbine and Kaplan turbine.

Sketch the different types of draft tubes? Give the formula for efficiency of it.

A Nozzle of 50mm diameter delivers a stream of water at 20m/s perpendicular to a plate that moves away from the jet at 5m/s. Find the force on the plate, the work done and the efficiency of jet.

Differentiate between Impulse turbine and Reaction turbine.

Derive an expression for specific speed of a centrifugal pump.

The cylinder bore diameter of a single acting reciprocating pump is 150 mm and its stroke length is 300 mm. The pump runs at 50 rpm and lifts water through a height of 25m. The delivery pipe is 22 m long and 100mm in diameter. Find the theoretical discharge. If the actual discharge is 4.2 liters/s, find the % Slip.

Draw and discuss the characteristic curves of centrifugal pump.

Enumerate the losses which occur when a centrifugal pump operates.