question pattern- fluid mechanics

8/13/2019 Question Pattern- Fluid Mechanics

1/4

Subject Name: FLUID MECHANICS

Unit I

Part A (Marks 2)1. Define fluid.

2. Differentiate between fluid and solid.

3. Define Specific volume

4. Define Specific gravity.

5. Define Viscosity.

Part B (Marks 16)

1. If the specific gravity of an oil is 0.86, find a) density b) weight density c) specific volume

2. A shaft of 60 mm dia is placed inside a sleeve of 150 mm dia. The sleeve rotates at a

speed of 700 rpm. If the viscosity of the liquid filled between the oil is 0.18 Poise

determine the shear stress on the shaft wall

3. A movable plate is 0.025 mm distant from a fixed plate. Difference in velocity between

the plate is 60 cm/s. If a shear stress of 2 N/m2is developed between the plate at that

particular velocity find the viscosity of the oil between the plate. The area of the

movable plate is 1 m2

4. Calculate the capillary rise of water and mercury in a capillary tube of 2 mm dia, if the

specific gravity of mercury is 13.6; water = 73 mN/m; Mercury = 500 mN/m; water = 15o;

Mercury = 150o

Unit II

Part A (Marks 2)

1. What is absolute pressure?

2. What is absolute zero pressure?

3. Write down the value of atmospheric pressure head in terms of water and Hg.

4. How manometers are classified.

5. State Pascals Law.

Part B (Marks 16)

1. Explain in detail stream line, streak line and path line?

2. Explain with Neat Sketches the working principle of a) Inverted U-tube Manometer b)

micro-manometer


2/4

3. A closed tank of height 8 m depth is filled with bromine of specific gravity 3.1 to a depth of 2m and turpentine of specific gravity 0.87 to a depth of 5 m. The upper part of tank contains airunder a pressure of 25 kPa. Find the absolute pressure at the bottom of the tank in kPa andalso in cm of mercury.

4. Determine the pressure difference between two pipes A and B shown in Fig 1 carrying

water. The specific gravity of manometric liquid is 0.9

Fig 1

Unit III

Part A (Marks 2)

1. State The Equation Of Continuity To Three Dimensional In Compressible Flow.

2. State Bernoullis Theorem As Applicable To Fluid Flow.

3. What Are The Three Major Assumptions Made In The Derivation Of The Bernoullis

Equation?

4. Write Down The Limitations Of Bernoullis Equation.

5. Mention Any 3 Applications Of Bernoullis Theorem.

Part B (Marks 16)

1. State and explain Bernoullis equation with assumptions?

2. Derive from basic principle the Euler equation of motion in two dimensional flow in x-y

co-ordinate system and reduce the equation to get Bernoullis equation for

unidirectional streamlined flow?

3. A swimming pool of 8m x 15m is to be filled to a depth of 2.5m. Determine the inflow

required in m cube per second for a filling time of 90 minutes. If 40mm pipes are

available and the water velocity in each hose is limited to 2m/s, determine the numberof hoses required?


3/4

4. A 400mm diameter pipe branches into two pipes of diameters 200mm and 250mm

respectively. If the average velocity in the 400mm diameter pipe is 2.2m/s, find the

discharge in the pipe. Also determine the velocity in 250mm pipe, if the average velocity

in 200mm diameter pipe is 2.6m/s?

Unit IV

Part A (Marks 2)

1. Mention The General Characteristics Of Laminar Flow.

2. Write Down Hagen-Poiseuille Equation For Laminar Flow.

3. What Is Boundary Layer? Give A Sketch Of A Boundary-Layer Region Over A Flat Plate.

4. What Is Meant By Laminar Boundary Layer?

5. Describe Briefly Turbulent Boundary Layer.

Part B (Marks 16)

1. Derive HagenPoiseuile equation and state the assumptions made?

2. Derive and expression for Darcy Weibach formula?

3. An oil of viscosity 0.023 N-s/meter square flows between two large infinite parallel plates

by a distance of 15mm. Calculate the 1. The pressure gradient along the flow 2. the

maximum velocity and 3. the shear stress at the walls, if the average velocity is 0.35m/s.

4. Fluid of density 1200 kg/meter cube and viscosity of 0.1 poise flow between two infinite

parallel plates separated by a distance of 18mm. If the discharge is 0.8 litres/s per unit widthof the plate, calculate the pressure drop per unit length?

Unit V

Part A (Marks 2)

1.Give The Dimensions Of Following Physical Quantities

(A) Pressure (B) Surface Tension (C) Dynamic Viscosity (D) Kinematic Viscosity

2. State The Fourier Law Of Dimensional Homogeneity

3. What Is Dimensionally Homogeneous Equation? Give Example.

4. What Are The Uses Of Dimensional Homogeneity

5.What Are The Points To Be Remembered While Deriving Expressions Using Dimensional

Analysis?

Part B (Marks 16)

1. Explain briefly Rayleighs Method?

2. Explain briefly Buckingham Pi Method?


4/4

3. What is Similitude and explain different similarities in model and prototype analysis?

4. Explain in detail about model or similarity laws?

question pattern- fluid mechanics

Documents