HYDRAULICS & FLUID MECHANICS QUIZ

In which of the following the friction drag is generally larger than pressure drag?

a sphere

a circular disc or plate held normal to flow

an airfoil

a cylinder

TRUE ANSWER : ?
YOUR ANSWER : ?

The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to

9810 PA

91 PA

1 PA

981 PA

TRUE ANSWER : ?
YOUR ANSWER : ?

A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

increase/decrease depending on depth of immersion

increase

decrease

remain same

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

675

337.5

300

600

TRUE ANSWER : ?
YOUR ANSWER : ?

Two dimensional flow occurs when

the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

the direction and magnitude of the velocity at all points are identical

the magnitude and direction of the velocity do not change from point to point in the fluid

the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

TRUE ANSWER : ?
YOUR ANSWER : ?

The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

All of these

the area is horizontal

the area is vertical

the area is inclined

TRUE ANSWER : ?
YOUR ANSWER : ?

Uniform flow occurs when

the flow is steady

size and cross section change uniformly along length

size and shape of the cross section in a particular length remain constant

the flow is streamline

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 ?

10 m/sec

50 m/sec

2 m/sec

25 m/sec

TRUE ANSWER : ?
YOUR ANSWER : ?

The horizontal component of force on a curved surface is equal to the

force on the horizontal projection of the curved surface

force on a vertical projection of the curved surface

weight of liquid vertically above the curved surface

product of pressure intensity at its centroid and area

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

(ii) and (iv)

(i) and (iv)

(ii) and (iii)

(i) and (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?