JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II MECHANICS OF FLUIDS AND HYDRAULIC MACHINES Previous Question Paper (September/October - 2023 - R13)

Define mass density and specific weight.

What is pitot tube?

What do you understand by hydrostatic law?

What is the physical significance of Reynold’s number?

Write down the expression for capillary fall.

Explain displacement thickness.

What is the need for priming in pump?

Differentiate between impulse turbine and reaction turbine?

What is the function of impeller?

Define slip of reciprocating pump.

Determine the specific gravity of fluid having dynamic viscosity 0.05 poise and kinematic viscosity is 0.035 stokes.

Define pressure. Obtain an expression for the pressure intensity at a point in a fluid.

Explain surface tension and capillarity with examples.

Compute the pressure of water in the pipe, if U-tube mercury manometer is connected to a pipeline conveying water at 0.7m below the centre of pipe and the other leg (right leg) is open to atmosphere. The level of mercury in the right leg is 0.2m below the centre of pipe and the space above mercury in the right leg contains oil of specific gravity 0.9 to a height of 0.3m.

Water is flowing through a pipe of 5 cm diameter under a pressure of 29.43 N/cm² and with mean velocity of 2m/sec. Find the total head or total energy/unit weight of water at a cross section which is 5m above datum line.

Write Euler’s equation of motion long a streamline and integrate it to obtain Bernoulli’s equation. State all assumptions made.

An oil of viscosity 0.1N/m² and relative density 0.9 is flowing through a circular pipe of diameter 50mm and of length 300mm. The rate of flow of fluid through the pipe is 3.5litre/sec. find the pressure drop in a length of 300m.

What are the losses experienced by a fluid when it is passing through a pipe?

What is boundary layer and give its significance with the diagram?

A pitot-tube is inserted in a pipe of 300mm diameter. The static pressure in pipe is 100mm of mercury (vacuum). The stagnation pressure at the center of the pipe, recorded by the pitot tube is 0.981N/cm² . Calculate the rate of flow of water through pipe, if the mean velocity of flow is 0.85 times the central velocity. Take Cv = 0.98.

Obtain an expression for head loss due to friction in the pipe. List all the assumptions made in the derivation.

A bend in a pipeline conveying water gradually reduces from 0.6 m to 0.3 m diameter and deflects the flow through an angle of 60°. At the larger end the gauge pressure is 171.675 kN/m² . Determine the magnitude and direction of the force exerted on the bend when the flow is 876 litres/s.

Draw main characteristic curves of hydraulic turbine.

A Pelton wheel is to be designed for the following specifications. Shaft power = 11772 kw, Head = 380 m, speed = 750 rpm, overall efficiency = 86%, jet diameter not to exceed 1/6 of wheel diameter. Determine i) Wheel diameter ii) Number of jets required iii) Diameter of jet. Coefficient of viscosity = 0.985, speed ratio = 0.45.

With the help of neat diagram explain the construction and working of a radial flow reaction turbine.

A jet of water of diameter 10cm strikes a flat plate normally with a velocity of 15m/sec. The plate is moving with a velocity of 6m/sec in the direction of jet and away from it. Find i) force exerted by the jet on the plate ii) work done by jet on plate/sec. iii) power of the jet

Derive an expression for specific speed for pump.

Explain the design of multistage centrifugal pump for high heads.

A double acting reciprocating pump running at 40 rpm is discharging 1.0 m³/minute. The pump has a stroke of 400 mm. The diameter of the piston is 200mm. The delivery and suction heads are 20m and 5m respectively. Find the slip of the pump and power required to drive the pump.

Explain important types of characteristic curves for turbine.