Fluid Mechanics

Question 1

equilibrium of liquids and the pressure exerted by liquid at rest.

Answer 1

hydrostatic

Question 2

two equations in hydrostatic

Answer 2

1. for constant density fluids (most liquids)
2. barometric equations (for ideal gas)

Question 3

two applications

Answer 3

1. simple manometers
2. two fluid u-tube manometer

Question 4

hydrostatic equilibrium is

Answer 4

fluid statics

Question 5

three equations for fluid dynamics

Answer 5

1. continuity equations
2. Overall energy balance equation
3. mechanical energy balance (MEB) equation

Question 6

two types of flow in mechanical energy balance equation

Answer 6

1. flow of compressible fluids
2. flow of incompressible fluids

Question 7

3 types of incompressible fluids

Answer 7

subsonic flow
sonic flow
supersonic flow

Question 8

actual velocity/velocity of sound

Answer 8

mach number

Question 9

When Mach number is less than 1.0 or V is less than C ( less than the speed of sound), then the flow is called

Answer 9

subsonic

Question 10

When Mach number equal to 1.0 or V is equal to C, then the flow is called

Answer 10

Sonic Flow

Question 11

When Mach number is greater than 1.0 or V is greater than C (greater than the speed of sound) , then the flow is called

Answer 11

Supersonic Flow

Question 12

where hydraulic diameter is applicable in replacement of diameter if flow is turbulent and completely filled

Answer 12

non-circular conduits

Question 13

if flow is laminar and completely filled use

Answer 13

equivalent diameter

Question 14

for power consumptions for the transport gases in fans use the mechanical energy balance equation for _________________. Considering that delta p is small and density between the two are similar

Answer 14

incompressible fluids

Question 15

the power consumption for the transport of gases when blowers are involved use the equation

Answer 15

integral of vdp from p0 to p1

Question 16

head available at the pump inlet to keep the liquid from cavitating or boiling

Answer 16

Net positive suction head (NPSH)

Question 17

4 metering of fluids

Answer 17

1. pitot tube
2. head meters (orifice, venturi, nozzles)
3. area meters (rotameters)
4. meters for open channel flow

Question 18

use the continuity equation and the MEB equation to be solved simultaneously

Answer 18

branching

Question 19

the power loss due to friction in a venturi meter is _____________ an orifice meter

Answer 19

less than

Question 20

fans and blowers are used to

Answer 20

transport gases

Question 21

pumps and blowers ____________ the mechanical energy of the fluid

Answer 21

increase

Question 22

a pump will operate safely if its NPSH is

Answer 22

greater than zero

Question 23

pump to use in capacity = 5000gal/min and head of 15ft of water

Answer 23

axial flow pump

Question 24

to use if the air is to be delivered at a rate of 200 cfm and a pressure of 10kpa

Answer 24

blower

Question 25

in a high pressure piping system where joints are regularly broken for maintenance, __________ joints are used

Answer 25

flanged

Question 26

the resistance of a layer of fluid to flow over the next layer is measured by

Answer 26

viscosity

Question 27

when movement of a gas vapor is effected at a low pressure (eg. 0.1 kg/cm^2) the equipment is

Answer 27

blower

Question 28

the inside surface of the pipe has no effect on the friction factor when the flow is

Answer 28

streamline

Question 29

the higher the BWG rating of a tube is, the lower is the

Answer 29

strength

Question 30

At a given flow rate through an orifice meter the differential pressure across the
orifice will increase when

Answer 30

the orifice flow area is decreased

Question 31

The prime mover of a jet pump is a/an

Answer 31

fluid momentum

Question 32

The weight rate of flow of a fluid stream per unit of cross section perpendicalar to the direction of flow is the

Answer 32

mean mass velocity of the stream

Question 33

In a reciprocating pump, the ratio of the quantity of liquid actually pumped to
which corresponds to the piston displacement is called

Answer 33

volumetric efficiency

Question 34

The schedule number of the pipe is an indicator of the pipe’s

Answer 34

thickness