1

GATE ME 2017 Set 1

MCQ (Single Correct Answer)

+2

-0.6

Consider steady flow of an incompressible fluid through two long and straight pipes of diameters $${d_1}$$ and $${d_2}$$ arranged in series. Both pipes are of equal length and the flow is turbulent in both pipes. The friction factor for turbulent flow though pipes is of the form, $$f = K{\left( {{\mathop{\rm Re}\nolimits} } \right)^{ - n}},$$ where $$K$$ and $$n$$ are known positive constants and $$Re$$ is the Reynolds number. Neglecting minor losses, the ratio of the frictional pressure drop in pipe $$1$$ to that in pipe $$2,$$ $$\left( {{{\Delta {P_1}} \over {\Delta {P_2}}}} \right),$$ is given by

2

GATE ME 2016 Set 3

Numerical

+2

-0

Consider a fully developed steady laminar flow of an incompressible fluid with viscosity $$\mu $$ through a circular pipe of radius $$R.$$ Given that the velocity at a radial location of $$R/2$$ from the center-line of the pipe is $${U_1},$$ the shear stress at the wall is $$K\mu {U_1}/R,$$ where $$K$$ is _________________.

Your input ____

3

GATE ME 2015 Set 2

Numerical

+2

-0

For a fully developed laminar flow of water (dynamic viscosity $$0.001$$ $$Pa$$-s) through a pipe of radius $$5$$ $$cm,$$ the axial pressure gradient is $$-10$$ $$Pa/m$$. The magnitude of axial velocity (in $$m/s$$) at a radial location of $$0.2$$ $$cm$$ is ____________

Your input ____

4

GATE ME 2015 Set 2

MCQ (Single Correct Answer)

+2

-0.6

The head loss for a laminar incompressible flow through a horizontal circular pipe is $${h_1}$$. Pipe length and fluid remaining the same, if the average flow velocity doubles and the pipe diameter reduces to half its previous value, the head loss is $${h_2}.$$ The ratio $${h_2}/{h_1}$$ is

Questions Asked from Laminar Flow (Marks 2)

Number in Brackets after Paper Indicates No. of Questions

GATE ME Subjects

Engineering Mechanics

Machine Design

Strength of Materials

Heat Transfer

Production Engineering

Industrial Engineering

Turbo Machinery

Theory of Machines

Engineering Mathematics

Fluid Mechanics

Thermodynamics

General Aptitude