HYDRAULICS & FLUID MECHANICS QUIZ

The normal stress is same in all directions at a point in a fluid

only when the fluid is incompressible and has zero viscosity

When there is no motion of one fluid layer relative to an adjacent layer

irrespective of the motion of one fluid layer relative to an adjacent layer

only when the fluid is frictionless

TRUE ANSWER : ?
YOUR ANSWER : ?

A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?

25 m/sec

2 m/sec

50 m/sec

10 m/sec

TRUE ANSWER : ?
YOUR ANSWER : ?

The discharge through a V- notch varies as

H3’2

H5’4 where H is head.

H1/2

H5/2

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following instrument can be used for measuring speed of an aeroplane

Venturimeter

pitot tube

rotameter

Orifice plate

TRUE ANSWER : ?
YOUR ANSWER : ?

For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is

inversely proportional to Reynolds number and indpendent of pipe wall roughness

directly proportional to Reynolds number and independent of pipe wall roughness

inversely proportional to Reynolds number and directly proportional to pipe wall roughness

directly proportional to pipe wall roughness and independent of Reynolds number

TRUE ANSWER : ?
YOUR ANSWER : ?

For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be

337.5

675

300

600

TRUE ANSWER : ?
YOUR ANSWER : ?

For measuring flow by a venturimeter, if should be installed in

horizontal line

in any direction and in any location.

vertical line

inclined line with upward flow

TRUE ANSWER : ?
YOUR ANSWER : ?

The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)

1/2 R

1/3 R

2/3 R

3/4 R

TRUE ANSWER : ?
YOUR ANSWER : ?

When a body floating in a liquid, is displaced slightly, it oscillates about

e.g. of body

center of pressure

center of buoyancy

metacentre

TRUE ANSWER : ?
YOUR ANSWER : ?

The increase in meta centric height i) increases stability ii) decreases stability iii) increases comfort for passengers iv) decreases comfort for passengers The correct answer is

(ii) and (iv)

(i) and (iv)

(i) and (iii)

(ii) and (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?

↑