JNTU B.Tech II FLUID MECHANICS Previous Question Paper (May/June - 2019 - R15)

List out different fluid properties and their units.

Distinguish gauge, vacuum and atmospheric pressures.

Distinguish between fluid statics and kinematics.

State and explain continuity equation.

Distinguish between notch and weir.

Explain why Cd of a Venturimeter is more than other meters.

Distinguish between drag and lift.

Describe Vonkarmen momentum integral equation.

Describe variation of friction factor with Reynold’s number.

Distinguish between pipes in series and pipes in parallel.

Derive an expression for the total pressure on an inclined surface.

A shaft of diameter 100 mm is rotating inside a journal bearing 102 mm at a speed of 360 r.p.m. The space between the shaft and bearing is filled with a lubricating oil of viscosity 5 poise. The length of the bearing is 200 mm. Find the power absorbed in the lubricating oil.

Explain the phenomenon of capillarity. Obtain an expression for capillary rise of a liquid.

A simple manometer is used to measure the pressure of oil (sp.gr.=0.9) flowing in a pipe line. It’s right limb is open to the atmosphere and left limb is connected to the pipe. The centre of the pipe is 8 cm below the level of mercury (sp.gr.13.6) in the right limb. If the difference of mercury level in the two limbs is 12 cm, determine the absolute pressure of the oil in the pipe in N/m².

Define stream line, path line and streak line. Derive mathematical expressions for each of these lines.

Water is flowing through a pipe having diameters 20 cm and 10 cm at the bottom and upper end respectively. The intensity of pressure at the bottom end is 32.43 N/cm² and the pressure at the upper end is 17.715 N/cm². Determine the difference in datum head if the rate of flow through pipe is 45 lit/s.

Define the following and give one practical example for each: (i) Laminar flow, (ii) Turbulent flow, (iii) Steady flow, and (iv) Uniform flow.

A pipe of diameter 20 cm carries water at a velocity of 25 m/sec. The pressures at the points A and B are given as 31.335 N/cm² and 26.43 N/cm² respectively. While the datum head at A and B are 24 m and 28 m, find the loss of head between A and B.

What is Euler’s equation of motion. How will you obtain Bernoulli’s equation from it.

A 70 cm diameter uniform pipe bend turns the directions of flow of gasoline of sp.gr. 0.8 through an angle of 110° in the horizontal plane. The constant pressure and velocity through the bend are 80 KPa and 2.8 m/s respectively. Find the magnitude and direction of the force to be exerted on the bend to achieve the directional change.

Differentiate between: (i) Bernoullis equation and Eulers equation, (ii) Velocity head and Pressure head, (iii) Energy equation and momentum equation.

The discharge of water through a pipe of diameter 30 cm is 300 litres/s. If the pipe is bend by 125°, find the magnitude and direction of the resultant force on the bend. The pressure of flowing water is 32.43 N/cm².

What do you mean by boundary layer separation. What is the effect of pressure gradient on boundary layer separation?

Describe laminar and turbulent boundary layers.

What are the boundary conditions that must be satisfied by a given velocity profile in laminar boundary layer flows? Explain.

Describe the characteristics of boundary layer along a thin flat plate.

Obtain expression for head loss in a sudden expansion in the pipe. List all the assumptions made in the derivation.

The rate of flow of water through a horizontal pipe is 0.25 m³/s. The diameter of the pipe is suddenly enlarged from 200 mm to 400 mm. The pressure intensity in the smaller pipe is 16.734 N/cm². Determine : (i) loss of head due to sudden enlargement, (ii) pressure intensity in the large pipe and (iii) power lost due to enlargement.

Show that the loss of head due to sudden contraction in pipe line is a function of velocity head.

Two sharp ended pipes of diameters 50 mm and 90 mm respectively, each of length 120 m are connected in parallel between two reservoirs which have a difference of level of 13 m. If co-efficient of friction for each pipe is 0.07, calculate the rate of flow for each pipe and also the diameter of a single pipe 150 m long which would give the same discharge if it were substituted for the original two pipes.