theory level 3 week one

Question 1

what is pneumatic

Answer 1

is branch of technology which deals with the study and the application of use of pressurized gas to affect mechanical motion

Question 2

what’s the formula of pressure ?

Answer 2

p=f/a

Question 3

what’s is pressure ?

Answer 3

pressure is the amount of force that presses on a certain area

Question 4

1 atmospheric is = to ………….mmHG ?

Answer 4

760 mmHG

Question 5

1 atmospheric is = to ………….lb/inc sequre

Answer 5

14.7

Question 6

1 atmospheric is = to ………….inHG ?

Answer 6

29.92 inHG

Question 7

what does cfm stands for ?

Answer 7

cubic feet per minute

Question 8

whats is CFM?

Answer 8

it is the measurement of the flow of gas or liquid

Question 9

air is a combination of gas . what are those the gases ?

Answer 9

nitrogen
oxygen
argon
other gases
water vapor

Question 10

there is ——–% of nitrogen in the air ?

Answer 10

78.09%

Question 11

there is ——–% of oxygen in the air ?

Answer 11

20.95%

Question 12

there is ——–% of argon in the air ?

Answer 12

1%

Question 13

there is ——–% of other gasses in the air ?

Answer 13

0.03%

Question 14

there is ——–% of water vapor in the air ?

Answer 14

0.003%

Question 15

what’s gas law ?

Answer 15

is the interrelation between volume temp and pressure.

Question 16

what’s boyles law ?

Answer 16

if temp is constant ,the volume will change inversely to the pressure

Question 17

formula of boyles law

Answer 17

v1 x p1= v2 x p2

Question 18

what is Charles law

Answer 18

if pressure is constant ,the volume will change in direct proportional to its absolute temp

Question 19

what’s the formula of charles law

Answer 19

v1/t1=v2/t2 or p1/t1=p2/t2

Question 20

whats gay lussac law

Answer 20

if volume is constant pressure is dirctly propotional to the abosult temp ?

Question 21

whats the formula of gays law?

Answer 21

p1/t1=p2/t2

Question 22

whats the combined gas law ?

Answer 22

is the combination of gays ,Charles and boyles law

Question 23

whats the formula of ideal (combined ) gas law ?

Answer 23

p1xv1 =p2xv2
t1 t2

Question 24

is a vacuume power a fluid power ?

Answer 24

yes

Question 25

what is a relative humidity?

Answer 25

it is the ratio of the amount of the water in the air at a given temp to the max amount it could hold at that temp ,expressed in a %

Question 26

what is a Absolut humidity?

Answer 26

it is the mas of the water vapor divided by the mas of dry air in a volume of air at a given temp

Question 27

the hotter the air is the more / less water it can contain

Answer 27

MORE

Question 28

what is DEW point ?

Answer 28

it is the temp at which the water vapor in the air become saturated and condensation begins

Question 29

the dew point is a measure of ……………..

Answer 29

atmospheric moisture

Question 30

how can moisture affect system ?

Answer 30

corrosion to the reservoir
corrosion to the piping
plugging filters
tools

Question 31

compressor air intake line should be …….

Answer 31

up high
away from parking lot
outside
nozzle should face down

Question 32

what does an after cooler does ?

Answer 32

cools air to the DEW point

Question 33

what should a receiver should have ?

Answer 33

safety valve
drain valve
fusible plug
pressure gauge

Question 33

at what psi should a safety valve be set at ?

Answer 33

set at 5 - 10% above the maximum system pressure

Question 34

where should a drain valve be located ?

Answer 34

at the lowest point of the receiver

Question 35

what is laminar flow ?

Answer 35

when fluid moves in larger parallel to conductor walls
fluid at the outer walls moves slower than the fluid in the center

Question 36

what is a turbulent flow ?

Answer 36

when a smooth flow is interrupted

Question 37

what is decentralized system ?

Answer 37

a decentralized system is composed of two or more compressors each with their own grid

Question 38

what is grid (dead end ) system ?

Answer 38

it have a decentralized main with feeder lines coming of the main .

Question 39

what is the benefit of a grid system ?

Answer 39

simple
least expensive

Question 40

what is a loop system ?

Answer 40

it ensures equal air distribution through out the plant
2 or more compressor feed the same loop
receivers can be through out the plant .

Question 41

what should we consider when installing a new piping?

Answer 41

it should be —
reliable
trouble free
and consider future expansion

Question 42

compressor room header discharge shouldn’t exceed a velocity of ——–

Answer 42

20ft/sec

Question 43

what is a shuttle valve

Answer 43

is used to automatically select the higher of the 2 pressure source to supply an actuator

Question 44

what is an absolute pressure ?

Answer 44

the air pressure around us .14.7 psia.

Question 45

what is a gauge pressure ?

Answer 45

the reading we get from a compressed air system that doest accunt for the atmospheric pressure

Question 46

how do you convert a gauge reading to absolute pressure ?

Answer 46

add 14.7

Question 47

when does a vacuum occur

Answer 47

when the pressure in a container is less than the pressure surrounding it or less than 14.7 psia

Question 48

what is perfect vacuum ?

Answer 48

0 psia or -14.7 psig ca

Question 49

can you measure vaccum and pressure with a barometer ?

Answer 49

yes
and scale can be in mm or hg or inches

Question 50

is bourdon tube considered accurate ?

Answer 50

NO

Question 51

is manometer considered accurate ?

Answer 51

yes it is the most accurate means of measuring a vacuum
shaped a u tube filled with water or oil /

Question 53

What does this symbol represent

Answer 53

Pneumatic regulator