(SEM III) THEORY EXAMINATION 2018-19 FLUID MECHANICS

The uploaded file is a B.Tech (Semester III) Theory Examination 2018–2019 question paper for the subject FLUID MECHANICS, with Sub Code RCE303.
The document consists of 2 printed pages, carries a total of 70 marks, and is meant to be completed in 3 hours.

This paper evaluates a student's theoretical understanding of fluid properties, equilibrium, fluid flow behavior, dimensional analysis, boundary layer theory, discharge computations, drag forces, and pressure forces. The exam blends basic definitions with applied numerical problems, conceptual reasoning, and diagram-based questions.

PAGE 1 — OVERVIEW & CONTENT

Page 1 contains the exam header and SECTION A, which includes short-answer questions worth 14 marks (2 marks × 7 questions).

SECTION A Topics Include:

Shear Stress vs Rate of Deformation

Students must draw the relationship curve showing Newton’s law of viscosity.

Perfect Gas                          Definition and essential properties.

Stable Equilibrium              Concept of fluid stability & equilibrium conditions.

Velocity Distribution Between Parallel Plates

Given velocity profile:
u=a−x2u = a - x^2u=a−x2
Students must find velocity at mid-distance and derive the stream function expression.

Surface Loss

Meaning and significance in fluid flow.

Dimensional Homogeneity

Explanation and importance in fluid equations.

Euler’s Equation of Motion

Basic understanding of fluid motion in inviscid flow.

This section tests basic conceptual clarity and understanding of fundamental fluid mechanics principles.

PAGE 2 — LONG ANSWER & NUMERICAL QUESTIONS

Page 2 contains large numerical and analytical problems worth 7 marks each.

QUESTION 5 — Pipe Flow & Discharge Problems

Students must answer any one part:

(a)

A 30 cm diameter horizontal pipe leads into a nozzle of 7.5 cm exit diameter. Water flows at 0.15 m³/s.
Students must compute:

Force exerted by the fluid on the nozzle

This involves applying momentum equation & velocity calculations.

(b)

Given a 80 mm diameter nozzle fitted to a large vessel where head = 6 m, find:

Discharge through external mouthpiece

This tests Bernoulli’s equation & discharge coefficient concepts.

QUESTION 6 — Boundary Layer & Aerodynamics

Students must answer any one part:

(a)

A kite (60 × 60 cm) weighs 3 N and makes 10° angle with horizontal.
A thread at 45° pulls with 25 N.
Wind speed = 15 m/s.
Find:

Coefficient of lift (Cl)

Coefficient of drag (Cd)

This applies lift–drag theory & aerodynamic force balance.

(b)

Explain:

Displacement thickness

Momentum thickness
and their relation to the boundary layer concept.

QUESTION 7 — Dimensional Analysis & Boundary Layer

This includes detailed analytical topics like:

Rayleigh method

Buckingham’s π-theorem

Deriving dimensionless numbers like Reynolds, Froude, Mach, Weber etc.
(Visible structure suggests it follows typical fluid mechanics exam format.)

OVERALL SUMMARY OF THE DOCUMENT

This FLUID MECHANICS – RCE303 exam paper thoroughly examines core civil/mechanical engineering concepts, including:

Fluid properties & behavior                                  Shear stress, viscosity, equilibrium

Velocity distribution in laminar flow                      Dimensional analysis & similarity laws

Boundary layer theory                                            Aerodynamic lift & drag

Pipe flow, discharge, and nozzle forces                  Euler’s motion equation & stream function

It is ideal for B.Tech engineering students preparing for university exams, competitive exams, or strengthening fluid mechanics fundamentals.