JNTU B.Tech II Year FLUID MECHANICS AND HYDRAULIC MACHINERY Previous Question Paper (May/June - 2019 - R13)

What is surface tension and what is its significance?

Define atmospheric pressure, gauge pressure and vacuum pressure.

Distinguish between stream line and stream tube.

Distinguish between major losses and minor losses.

State different types of storage requirement in hydro electric power plant.

Derive an expression for the force exerted by a jet of water on a inclined flat plate when plate is at rest.

How to select a particular turbine in a particular place?

Define draft tube and explain its significance.

Define Specific speed of a centrifugal pump.

Distinguish between manometric head and static head.

Explain the manometer that can be used for very precise measurement of small pressure difference between two points with a neat sketch.

A sleeve 12 cm long encases a vertical metal rod 3.2 cm in diameter with a radial clearance of 0.15mm. When immersed in an oil of viscosity 5.95 poise, the effective weight of the sleeve is 8.5N. Will the sleeve slide down the rod and if so at what velocity?

What is the difference between U-tube differential manometer and inverted U-tube differential manometer? Where they are used. Why?

The pressure inside a droplet of water is 0.15 N/cm² greater than the atmospheric pressure. Calculate the diameter of the droplet. Take surface tension (water with air) = 78 N/m.

How will you determine the loss of head due to friction in pipes by using Darcy formula?

Derive Bernoulli’s equation of motion for a flow along a stream line and state the requisite assumptions clearly.

Distinguish between momentum equation and impulse momentum equation.

The difference in water surface levels in two tanks, which are connected by three pipes in series of lengths 320 m, 160 m and 200 m and of diameters 310 mm, 180 mm, and 90 mm respectively, is 12 m. Determine the rate of flow of water if Co-efficient of friction are 0.005, 0.0052 and 0.0048 respectively, considering: i) Minor losses also ii) Neglecting minor losses.

Show that when a jet of water impinges on a series of curved vanes, maximum efficiency is obtained when the vane is semi-circular in section and the velocity of a vane is half that of jet.

Distinguish between firm power and secondary power in detail.

Derive an expression for force exerted on a series of vanes and also find its efficiency.

Distinguish between storage reservoir and surge tank in detail.

By means of a neat sketch, explain the governing mechanism of Francis Turbine.

A pelton wheel is to be designed for a head of 65 m when running at 220 r.p.m. The pelton wheel develops 91.3674 kW shaft power. The velocity of the buckets is 0.48 times the velocity of the jet, overall efficiency is 0.81 and Co-efficient of the velocity is equal to 0.99.

Define various unit quantities i) Unit power ii) Unit speed iii) Unit discharge.

A turbine develops 9357 kW when running at 16 r.p.m. The head on the turbine is 35 m. If the head on the turbine is reduced to 15 m. Determine the speed and power developed by the turbine.

With a neat sketch, explain the principle and working of a centrifugal pump.

The diameter of an impeller of a centrifugal pump at inlet and outlet are 30 cm and 60 cm respectively. Determine the minimum starting speed of the pump if it works against a head of 30 m.

What do you mean by pump characteristics? Briefly explain the uses of such characteristics.

A centrifugal pump is to be discharged 0.125 m³/s at a speed of 1650 r.p.m. against a head of 21 m. The impeller diameter is 240 mm, its width at outlet is 55 mm and manometric efficiency is 71%. Determine the vane angle at the outer periphery of the impeller.