HYDRAULICS & FLUID MECHANICS QUIZ

Mercury is often used in barometer because

the height of barometer will be less

both (B) and (C)

it is the best liquid

its vapour pressure is so low that it may be neglected

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 friction

force of cohesion

force of diffusion

force of adhesion

TRUE ANSWER : ?
YOUR ANSWER : ?

In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is

50 M/SEC

33 M/SEC

40 M/SEC

22.5 M/SEC

TRUE ANSWER : ?
YOUR ANSWER : ?

The resultant of all normal pressures acts

at metacentre

at center of pressure

at e.g. of body

vertically upwards

TRUE ANSWER : ?
YOUR ANSWER : ?

To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than

5.0 above the hydraulic gradient

6.4 m above the hydraulic gradient

10.0 m above the hydraulic gradient

2.4 m above the hydraulic gradient

TRUE ANSWER : ?
YOUR ANSWER : ?

When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies

as the square of the radial distance

inversely as the radial distance

linearly with radial distance

inversely as the square of the radial distance

TRUE ANSWER : ?
YOUR ANSWER : ?

For a floating body to be in equilibrium

center of buoyancy and e.g. must lie on same vertical plane

All of these

meta center should be above e.g.

a righting couple should be formed

TRUE ANSWER : ?
YOUR ANSWER : ?

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

p = T/2r

(b)p = T/r

(a)p = Txr

(d)p = 2T/r

TRUE ANSWER : ?
YOUR ANSWER : ?

A fluid is said to be ideal, if it is

inviscous and compressible

inviscous

incompressible

inviscous and incompressible

TRUE ANSWER : ?
YOUR ANSWER : ?

Fluid is a substance that

has the same shear stress.at a point regardless of its motion

always expands until it fills any container

cannot remain at rest under action of any shear force

cannot be subjected to shear forces

TRUE ANSWER : ?
YOUR ANSWER : ?