FLUID MECHANICS QUIZ

Momentum transfer in laminar flow of fluids results due to the

Velocity gradient

Viscosity

None of these

Density

TRUE ANSWER : ?
YOUR ANSWER : ?

The Prandtl mixing length is

Independent of the shear stress

Independent of radial distance from the pipe axis

Useful for computing laminar flow problems

Zero at the pipe wall and is a universal constant

TRUE ANSWER : ?
YOUR ANSWER : ?

Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.

0.001

0.01

0.1

1

TRUE ANSWER : ?
YOUR ANSWER : ?

Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an

Venturimeter

Pitot tube

Orificemeter

Rotameter

TRUE ANSWER : ?
YOUR ANSWER : ?

N²Re/NFr is called the __________ number.

Euler

Archimedes

Brinkman

Galileo

TRUE ANSWER : ?
YOUR ANSWER : ?

If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).

V₁ = V₂ = V₃

Q₁ = Q₂ = Q₃

F = f₁ + f₂ + f₃

Q = Q₁ + Q₂ + Q₃

TRUE ANSWER : ?
YOUR ANSWER : ?

Dimension of kinematic viscosity is

L² . T⁻¹

MLT⁻¹

L²T

L² . T⁻²

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of inertial forces to elastic forces is called the __________ number.

Euler

Mach

Weber

Reynolds

TRUE ANSWER : ?
YOUR ANSWER : ?

A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now

Remain same

Data insufficient to predict

Decrease

Increase

TRUE ANSWER : ?
YOUR ANSWER : ?

Steady uniform flow is represented by flow through a/an

Long pipe at decreasing rate

Expanding tube at constant rate

None of these

Long pipe at constant rate

TRUE ANSWER : ?
YOUR ANSWER : ?

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