About this previous year paper
This document is the B.Tech SEM–III Theory Examination 2019–20 question paper for Fluid Mechanics & Fluid Machines (KME302) under Dr. A.P.J. Abdul Kalam Technical University (AKTU).
The uploaded file contains two pages, printed clearly with diagrams and numerical problems.
The paper is divided into three sections — SECTION A, SECTION B, and SECTION C.
The exam duration is 3 hours, and the total marks are 100.
The questions evaluate students’ understanding of fluid properties, pressure, Bernoulli’s theorem, surface tension, Euler number, drag/lift forces, pumps, pitot tube, velocity field, Buckingham π-theorem, viscous flow, continuity, and pipe-flow calculations.
SECTION A — Short Questions (10 × 2 = 20 Marks)
Section A contains ten 2-mark questions, each focused on fundamentals of fluid mechanics and fluid properties:
Specific weight, mass density, specific volume & specific gravity of petrol (based on 2-liter weight data)
Surface tension of soap bubble (diameter 40 mm) with given internal pressure
Meaning of Euler’s number
Bernoulli’s theorem
Water hammering
Drag & lift force on flat plate moving in air
Force exerted by a water jet on stationary plate
Difference between turbine and pump
Classification of turbines
Meaning of slip, % slip & negative slip of reciprocating pump
These questions check conceptual clarity and quick formula recall.
SECTION B — Descriptive/Numerical Questions (Attempt Any 3 × 10 = 30 Marks)
(Page 1 bottom)
Students must attempt any three out of five 10-mark questions.
Topics include:
Fluid properties, pressure forces, buoyancy
Surface tension, capillarity
Laminar & turbulent flow
Bernoulli equation applications
Hydraulic turbine basics
Pump performance
Numerical problems involving jet impact, pipe friction, and specific energy
These require detailed derivation, explanation, and calculations.
SECTION C — Applied & Numerical Questions (Q3, Q4, Q5)
(Displayed on Page 2)
Section C contains three groups (Q3, Q4, Q5).
Each group offers two alternative questions (a or b).
Students must answer one from each group.
Q3 — Pipe-Flow / Pitot Tube
(Visible clearly on Page 2)
(a) A 30 cm diameter pipe splits into two pipes (20 cm & 15 cm).
Given the velocity in main pipe is 2.5 m/s, find:
Discharge in the main pipe
Velocity in the 15 cm pipe
Velocity in 20 cm pipe when the 20 cm pipe velocity is 2 m/s
(b) What is a pitot tube?
How to determine velocity at any point using it?
Q4 — Circulation / Buckingham π-Theorem
(Page 2)
(a) For velocity field:
- u=x+y,v=x3−yu = x + y,\quad v = x^3 - yu=x+y,v=x3−y
Find the circulation around closed contour: x=1,y=0,y=1,x=0x = 1, y = 0, y = 1, x = 0x=1,y=0,y=1,x=0.
(b) Pressure difference Δp in a pipe depends on velocity V, viscosity μ, and density ρ.
Using Buckingham π-theorem, derive the relationship for Δp.
Q5 — Viscous Flow / Shear Stress
(Page 2)
(a) A fluid with viscosity 0.7 Ns/m² and specific gravity 1.3 flows through a pipe of diameter 100 mm.
The maximum shear stress at pipe wall is given.
Calculate:
Pressure gradient
Average velocity
Flow rate
(b) Variations may include velocity distribution, Hagen–Poiseuille flow, energy correction factors, etc.
OVERALL SUMMARY OF THE DOCUMENT
The Fluid Mechanics & Fluid Machines (KME302) question paper examines:
Fluid properties (density, viscosity, specific gravity)
Surface tension & pressure inside bubbles
Bernoulli’s theorem & Euler number
Drag & lift on flat plate
Jet impact on plates
Pumps (slip, negative slip, classification)
Turbines
Pipe-flow discharge & continuity
Pitot tube velocity measurement
Velocity fields & circulation
Buckingham π-theorem (dimensional analysis)
Viscous flow through pipes
Shear stress, pressure gradient & average velocity
The uploaded paper spans 2 pages, includes clear numericals, table-based questions, and applications of continuity, momentum, and viscosity equations.