JNTU B.Tech II FLUID MECHANICS - II Previous Question Paper (April/May - 2023 - R16)

Explain Rapidly varied flow and gradually varied flow.

What is specific energy curve?

Give the equation for Froude’s number and Mach number.

Define the terms dimensional analysis and model analysis.

Define momentum and nozzle.

Give applications of Impact of jet.

How will you classify the turbines?

Differentiate between turbines and pumps.

Define slip and percentage slip.

Differentiate between volute and vortex casing for centrifugal pump.

Prove that for the trapezoidal channel of most economical section, half of top width is equal to the length of one of the sloping sides?

For a trapezoidal channel with bottom width 40 m and side slopes 2H: 1V, Manning’s N is 0.015 and bottom slope is 0.0002. If it carries 60 m³/s discharge, determine the normal depth?

Derive the condition for the maximum discharge for a given value of specific energy?

The specific energy for a 5 m wide rectangular channel is to be 4 Nm/N. if the rate of flow of water through the channel is 20 m³/s, determine the alternate depths of flow.

In a static fluid, the pressure ‘P’ at a point is known to depend upon the specific weight ρg and its depth z below the free surface. By dimensional method, determine the form of the hydrostatic law?

A pipe of diameter 1.5 m is required to transport an oil of specific gravity 0.90 and viscosity 3×10^-2 poise at the rate of 3000 litres/s. Tests were conducted on a 15 cm diameter pipe using water at 20⁰C. Find the velocity and rate of flow in the model. Viscosity of water at 20⁰C = 0.01 poise.

Show that ratio of inertia force to viscous force gives Reynolds number.

Determine the pressure drop across an orifice installed in a 30 cm diameter pipe for dynamic similarity to exit between this and another orifice in 10 cm diameter pipe where a pressure drop of 10 cm of mercury is registered across a 4 cm diameter orifice. The fluid in each case is water.

How do you estimate the impact of a jet striking a moving normal plate in the direction of the jet?

A nozzle of 50 mm diameter delivers a stream of water at 20 m/s perpendicular to a plate that moves away from the jet at 5 m/s. find: i) The force on the plate ii) The work done, and iii) The efficiency of jet.

A jet of water of diameter 7.5 cm strikes a curved plate at its centre with a velocity of 20 m/s. The curved plate is moving with a velocity of 8 m/s in the direction of the jet. The jet is deflected through an angle of 165⁰. Assuming the plate smooth find: i) Force exerted on the plate in the direction of jet. ii) Power of the jet. iii) Efficiency of the jet.

Obtain an expression for the force exerted by a jet of water on a fixed vertical plate in the direction of the jet.

What do you mean by gross head, net head, and efficiency of turbine. Explain different types of efficiency of a turbine?

A Pelton wheel is having a mean bucket diameter of 1 m and is running at 1000 r.p.m. The net head on the Pelton wheel is 700 m. if the side clearance angle is 15⁰ and discharge through nozzle is 0.1 m³/s, find: (i) Power available at the nozzle and (ii) Hydraulic efficiency of the turbine.

Define specific speed of a turbine and derive an expression for the same. Show that the Pelton turbine is a low specific speed turbine.

A turbine develops 9000 kW when running at 10 rpm. The head on the turbine is 30 m. if the head on the turbine is reduced to 18 m, determine the speed and power developed by the turbine.

What is the difference between single-stage and multistage pumps? Describe multistage pump with (i) impellers in parallel (ii) impellers in series.

A three-stage centrifugal pump has impellers 40 cm in diameter and 2 cm wide at outlet. The vanes are curved back at the outlet at 45⁰ and reduce the circumferential area by 10%. The manometric efficiency is 90% and the overall efficiency is 80%. Determine the head generated by the pump when running at 1000 r.p.m. delivering 50 litres per second. What should be the shaft horse power?

What is reciprocating pump? Describe the principle and working of reciprocating pump.

What is priming? Why is it necessary?