Module K (160301)

Question 1

__________________ involves the compression of gases to raise pressure, which is then put to work when the gas is allowed to expand in a controlled manner.

Answer 1

Pneumatics

Question 2

Air receivers are pressure vessels and, as such, come under the applicable codes enforced under the __________________

Answer 2

Alberta Boiler and Pressure Vessels Act

Question 3

What is the purpose of cyclone separators and dryers?

Answer 3

They dispose of moisture in pneumatic system lines to prevent problems

Question 4

What are the three piping systems?

Answer 4

1. Grid
2. Decentralized
3. Loop

Question 5

Which is the simplest piping system?

Answer 5

Grid

Question 6

Which piping system is also known as a dead end system?

Answer 6

Grid

Question 7

The pros of a grid systems are that they are simple and cheap. What are the cons of this system?

Answer 7

Because there is only one flow path for the air, workstations at the end of the system may experience air starvation.

Question 8

What is the downside of using oversized compoents?

Answer 8

Though oversized components increase efficiency, they cost more to install

Question 9

The ________________ problem is alleviated by a line sloping towards a water leg and the drop taken off the top of the main line.

Answer 9

mositure

Question 10

The FRL unit must be installed in the air line in the correct position to prevent ___________________

Answer 10

contamination damage

Question 11

What is the correct order to install an FRL unit?

Answer 11

1. The filter vto clean the air and protect downstream components (like regulator)
2. The regulator to maintain a set system pressure
3. The lubricator to add a mist of oil to the air stream

Question 12

What happens when an FRL is installed backwards?

Answer 12

The oil from the lubricator would gum up the regulator and then the filter would remove any oil left in the air before it got to its point of use

Question 13

The ____________ around the filter keeps the swirling air from affecting the operation of the filter

Answer 13

Shroud

Question 14

The __________ below the filter prevents the contaminants and moisture from becoming airborne again

Answer 14

baffle

Question 15

What would happen if the spring in a regulator broke?

Answer 15

the valve will shut off

Question 16

A piece of white cardboard placed near the ________________ of the component should give a pale yellow indication of oil.

Answer 16

exhaust port

Question 17

What does dripping oil from the exhaust port mean?

Answer 17

the lubricator needs to be adjusted

Question 18

Which motors are used in equipment due to their low weight and compact size?

Answer 18

Vane motor

Question 19

What are some examples of equipment which uses a vane motor?

Answer 19

impact guns, grinders, and drills

Question 20

What is the most common flow control valve for smaller pneumatic actuators?

Answer 20

needle valve

Question 21

What is the most common flow control valve for larger pneumatic sysmetms?

Answer 21

ball and globe valves

Question 22

What is the difference between venting regulators and non-venting regulators?

Answer 22

Venting regulators also act as relief valves for the downstream section of the circuit to prevent any possibility of an increase in pressure in this section

Question 23

How does pressure affect the amount of moisture in the air?

Answer 23

The increase in pressure tends to reduce the amount of moisture the air can carry.

Question 24

How does an increase in temperature affect affect the amount of moisture in the air?

Answer 24

Increased temperature will lead to an increase in moisture in the air

Question 25

The best way to determine a dryer's condition is measurement of ______________

Answer 25

dew point

Question 26

How can you measure a dryer's dew point?

Answer 26

With a sensor called a dew point hygrometer

Question 27

________________ is the only mechanical means of drying air that suppresses or lowers the dew point

Answer 27

over-compression

Question 28

What is over-compression?

Answer 28

the mechanical means of drying air which can lower the dew point

Question 29

Centrifugal separators are sometimes called _______________ separators

Answer 29

cyclonic

Question 30

Where are centrifugal separators located?

Answer 30

downstream of compressor aftercoolers or wherever excess moisture needs to be removed

Question 31

_______________ is heat that is added or removed and cannot be sensed by a thermometer

Answer 31

latent heat

Question 32

What is a British Thermal Unit (BTU)?

Answer 32

The amount of heat required to raise the temperature of 1 pound of water by 1 degree Fahrenheit.

Question 33

How many BTUs does it take to raise 1 pound of water by 1*F?

Answer 33

One BTU

Question 34

How many BTUs does it take to vaporize one pound of water?

Answer 34

970 BTU

Question 35

What is a calorie?

Answer 35

The heat energy required to raise 1 gram of water by 1*C at atmospheric pressure

Question 36

______________________ are the least expensive method of dew point reduction from both operational and maintance perspectives

Answer 36

refrigeration dryers

Question 37

What is bead-type modified silica gel?

Answer 37

similar to silica gel, but spherical in shape. This gel is very porous

Question 38

How is the correct dryer size chosen?

Answer 38

By ensuing dryers provide the correct velocities so that the air passing through the desiccant spends adequate time in contact with it to ensure proper moisture removal.

Question 39

What is the benefit of a system that measures the dew point of the air leaving the dryer?

Answer 39

Since it prevents switching to regeneration cycle until the air exiting is not in acceptable limits, there is: 1. reduced wear of moving parts in valves 2. increased desiccant life

Question 40

______________ dryers can achieve lower dew points than any other types of dryer

Answer 40

adsorption

Question 41

What is regeneration?

Answer 41

A term used for the process of removing the accumulation of moisture from the dryer bed

Question 42

What are some examples of mechanical dryers?

Answer 42

- liquid separators - centrifugal separators - demister pads - over-compression - coalescing filters

Question 43

What is a mechanical dryer?

Answer 43

A device that uses a mechanical or physical means to cause moisture to fall out of the air stream such as barriers and filters.

Question 44

What is the difference between the packed bore design and the packed spool design?

Answer 44

Packed bore: the o-rings are fixed in grooves in the body through which the spool slides Packed spool: the o-rings are fixed in the spool

Question 45

What is a FRL unit?

Answer 45

filter regulator lubricator unit

Question 46

fog lubricators serve best when the flow to the component is _________ and _______

Answer 46

straight and short

Question 47

mist lubricators serve best when the oil must be ____________________________

Answer 47

carried for long distances, so that the oil will not settle in the line

Question 48

To function correctly, many ________components require lubrication

Answer 48

pneumatic

Question 49

____________________ supply clean oil into the line to be carried to the components

Answer 49

air lubricators

Question 50

Where must the air lubricator be located?

Answer 50

downstream from any device that might be contaminated by lubricating oil (such as paint sprayers)

Question 51

A ______________ swirls the air around the filter bowl

Answer 51

deflector

Question 52

Air dryers can lower the dew point to as low as ________

Answer 52

-40*C or -40*F

Question 53

Deliquescent dryers contain ______________________.

Answer 53

chemical dessicants

Question 54

What happens to the chemical desiccants that absorb moisture in a deliquescent dryer?

Answer 54

they are consumed

Question 55

The safety valve is usually set _____% above the system's maximum pressure.

Answer 55

5% to 10%

Question 56

What is the usual maximum working air pressure?

Answer 56

690 kPa (100psi)

Question 57

What is the purpose of a safety valve?

Answer 57

to release any excessive pressure due to the failure of the unloading valve or a pressure surge

Question 58

The air receiver is built to specific standards. Safe operation requires that the receiver is equipped with which four items for safety?

Answer 58

1. Relief or safety valve 2. Drain valve 3. Fusible plug 4. Air pressure gauge

Question 59

When do aftercoolers cool the air?

Answer 59

Heat exchangers cool the air after it leaves the compressor and before it enters the receiver.

Question 60

Which component can also act as an aftercooler?

Answer 60

a receiver

Question 61

Where is a water trap installed?

Answer 61

Wherever the compressed air is cooled and may fall below its dew point.

Question 62

The amount of air slip in all screw compressors can be reduced by increasing _____________________

Answer 62

the rpm of the rotors

Question 63

What is the maximum continuous vacuum rating of a rotary vane (multi-stage) vacuum pump?

Answer 63

29.5 "Hg

Question 64

Under atmospheric pressure at sea level, pressure gauges read ______

Answer 64

zero (0 psig)

Question 65

How can you calculate the psia value?

Answer 65

Add 14.7 to psig

Question 66

Absolute zero, the temperature where no molecular movement occurs is equal to ______*C and ______*F

Answer 66

-273*C and -459*F

Question 67

What is the pressure rating at absolute zero?

Answer 67

0 psia

Question 68

What is the pressure rating at sea level, under normal conditions of temperature?

Answer 68

14.7 psia