JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II HYDRAULICS AND HYRAULIC MACHINERY Previous Question Paper (April - 2018 - R15)

Differentiate between laminar and turbulent flow.

What is specific energy curve?

Define dimensional analysis.

Define the term hydraulic similitude.

What is Jet propulsion?

Explain the term angular momentum principle.

What is a draft tube?

What are surge tanks?

What is meant by manometric efficiency?

Define the terms load factor and capacity factor.

Find the head lost due to friction in a pipe of diameter 300mm and length 50m, through which water is flowing at a velocity of 3 m/s using (i) Darcy's formula (ii) Chezy’s formula for which C = 60.

Derive an expression for the variation of depth along the length of the bed of the channel for gradually varied flow in an open channel. State clearly all the assumptions made.

Derive an expression for jump depth.

A uniform flow of 9 m³/s occurs at a depth of 1.5m in a long rectangular channel of 3 m wide. Compute the minimum height of a flat top hump that can be built on channel floor in order to produce Critical depth.

Describe Rayleigh’s method for dimensional analysis.

What are the different laws on which models are designed for dynamic similarities? Where are they used?

State Buckingham’s pi theorem. Why this theorem is considered superior over Rayleigh’s method for dimensional analysis?

Explain the terms distorted and undistorted models. What is the use of distorted models?

A jet of water of diameter 50 mm moving with a velocity of 25 m/s impinges on a fixed curved plate tangentially at one end at an angle of 30º to the horizontal. Calculate the resultant force of the jet on the plate if the jet is deflected through an angle of 50º. Take g = 10 m/s².

Draw the inlet and outlet velocity triangles for Pelton turbines and indicate various velocities of flow.

Show that for a curved radial vane, the work done per second is given by specific expression.

Describe the various applications of radial flow turbines.

With the help of a neat sketch explain the governing of Francis turbine.

What are unit quantities? Define the unit quantities for a turbine. Why are they important?

Obtain an expression for unit discharge and unit power for a turbine.

Define the term governing of turbines. Describe with neat sketch, the working of an oil pressure governor.

Find the number of pumps required to take water from a deep well under a total head of 89 m. All the pumps are identical and are running at 800 r.p.m. The specific speed of each pump is given as 25 while the rated capacity of each pump is 0.16 m³/s.

What do you understand by characteristics curves of a pump? What is the significance of the characteristics curves?

Define cavitation. What are the effects of cavitation? Give necessary precautions against cavitation.

What are the characteristic curves? Explain the significance of it.