HYDRAULICS & FLUID MECHANICS QUIZ

A large Roynold number is indication of

turbulent flow

highly turbulent flow.

LAMINAR FLOW

smooth and streamline flow

TRUE ANSWER : ?
YOUR ANSWER : ?

Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

force of diffusion

force of cohesion

force of friction

force of adhesion

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)

2/3 R

1/3 R

1/2 R

3/4 R

TRUE ANSWER : ?
YOUR ANSWER : ?

Least possible value of correction factor for i) kinetic energy is zero ii) kinetic energy is 1 iii) momentum is zero iv) momentum is 1 The correct statements are

(i) and (iii)

(i) and (iv)

(ii) and (iii)

(ii) and (iv)

TRUE ANSWER : ?
YOUR ANSWER : ?

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

only when the fluid is incompressible and has zero viscosity

only when the fluid is frictionless

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

TRUE ANSWER : ?
YOUR ANSWER : ?

The surface tension of mercury at normal temperature compared to that of water is

same

more

less

more or less depending on size of glass tube

TRUE ANSWER : ?
YOUR ANSWER : ?

Ay between two stream lines represents

head

velocity

pressure

discharge

TRUE ANSWER : ?
YOUR ANSWER : ?

Select the correct statement

A barometer reads the difference be-tween local and standard atmospheric pressure

Local atmospheric pressure is always below standard atmospheric pressure

Local atmospheric pressure depends upon elevation of locality only

Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

TRUE ANSWER : ?
YOUR ANSWER : ?

According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

less than the weight of the body

weight of the fluid displaced by the body

more than the weight of the body

the weight of the body

TRUE ANSWER : ?
YOUR ANSWER : ?

The difference of pressure between the inside and outside of a liquid drop is

(a)p = Txr

p = T/2r

(d)p = 2T/r

(b)p = T/r

TRUE ANSWER : ?
YOUR ANSWER : ?