Fluid Mechanics

Question 1

a physical science dealing with the action of fluids at rest or in motion

Answer 1

fluid mechanics

Question 2

a state of matter that yields to sideways or shearing forces.

Answer 2

fluid

Question 3

weight per unit volume of fluid

Answer 3

unit weight or specific weight

Question 4

mass of fluid per unit of volume

Answer 4

density or mass density

Question 5

property of fluid which determines the amount of its resistance to shearing forces.

Answer 5

viscosity

Question 6

work that must be done to bring enough molecules from inside the liquid to the surface to form a new unit area.

Answer 6

surface tension

Question 7

the rise or fall of a fluid in a capillary tube which is cause by the surface tension and depends on the relative magnitudes

Answer 7

capillarity

Question 8

expresses the compressibility of the fluid.

Answer 8

bulk modulus of elasticity (fluid)

Question 9

where p is absolute pressure, v is the specific volume, and n may have any non-negative value from zero to infinity.

Answer 9

perfect gas

Question 10

if there is no heat transfer to and from the gas, the process is known as

Answer 10

adiabatic

Question 11

the temperature of a given mass of gas remains constant, the absolute pressure of the gas varies inversely with the volume

Answer 11

boyle’s law (perfect gas)

Question 12

this disturbance imposed on a fluid move in waves.

Answer 12

pressure disturbance

Question 13

unit weight or specific weight formula (y)

Answer 13

y=Weight of fluid/volume

Question 14

one of the major areas of fluid mechanics that deals with fluids at rest

Answer 14

fluid statics

Question 15

one of the major areas of fluid mechanics that deals with fluids in motion

Answer 15

fluid dynamics

Question 16

anybody immersed in a fluid is subjected to an upward force called

Answer 16

Bouyant force

Question 17

amount of fluid passing a section of a stream in unit time is called

Answer 17

discharge

Question 18

is said to be laminar when the paths of the individual particles do not cross or intersect

Answer 18

laminar flow

Question 19

the flow is laminar when the Reynold’s number (Re) is

Answer 19

less than 2000

Question 20

when its path lines are irregular curves and continuously cross each other, the flow is said to be

Answer 20

turbulent flow

Question 21

turbulent flow in reynolds’ number is

Answer 21

greater than 2100

Question 22

turbulent flow in highly controlled environment such as labs, laminar flow can be maintained up to values of

Answer 22

Re as high as 50,000

Question 23

occurs if the discharge Q passing a given cross section of a stream is constant with time.

Answer 23

steady flow

Question 24

the flow is said to be ____, if with steady flow for a given length, or reach of a stream, the average velocity at every cross-section is the same

Answer 24

uniform flow

Question 25

ratio of inertia forces to viscous forces

Answer 25

reynolds number

Question 26

by the principle of conservation of mass, continuous flow occurs when at any time, the discharge Q at every section of the stream is the same

Answer 26

Continuous flow

Question 27

ability to do work

Answer 27

energy

Question 28

two-commonly recognized forms of energy

Answer 28

kinetic and potential energy

Question 29

ability of a mass to do work by virtue of its velocity

Answer 29

kinetic energy

Question 30

a mass of fluid acquires pressure energy when it is in contact with other masses having some form of energy

Answer 30

pressure head

Question 31

an energy transmitted to the fluid by another mass that possesses some energy

Answer 31

pressure energy

Question 32

rate of doing work per unit of time

Answer 32

power

Question 33

“neglecting head lost, the total amount of energy per unit weight is constant at any point in the path of flow

Answer 33

Bernoulli’s energy theorem

Question 34

used to raise water from lower elevation to higher elevation or its use is basically to increase the energy of flow

Answer 34

pump

Question 35

extract flow energy and converted it into mechanical energy which in turn converted into electrical energy

Answer 35

turbine