Controls - Part B

Question 1

The three (3) primary reasons for sensing and measuring variables are to __________, __________, and __________.

Answer 1

Indicate, record, and control

Question 2

The four (4) main types of measured variables are __________, __________, __________, and __________.

Answer 2

Temperature, pressure, liquid level, and flow rate

Question 3

To protect thermometers and other sensing bulbs from high external pressures and possible damage, __________ are installed in pressure vessels and pipe.

Answer 3

Thermowells

Question 4

The __________ __________ __________ produces a longer scale of measurement than other types, so a more accurate reading can be taken.

Answer 4

Inclined tube manometer

Question 5

__________ or __________ to be applied to the gauge is connected to the housing that encloses the diaphragm.

Answer 5

Pressure or vacuum

Question 6

As a result, the __________ rises and falls with the liquid level, and this movement can be used to operate a control valve.

Answer 6

Float

Question 7

An __________ __________ is the most common form of restriction used to measure flow.

Answer 7

Orifice plate

Question 8

The term __________ __________ is explained as the point where the area is at a minimum size; therefore, the fluid is at its highest velocity and lowest pressure

Answer 8

Vena contracta

Question 9

__________ __________ sense impact and static pressure at the same instant.

Answer 9

Pitot tubes

Question 10

On small systems, a __________ __________ __________ located in the compressor room supplies reduced pressure to the entire control system.

Answer 10

Pressure reducing station

Question 11

The __________ __________ is to prevent dust or other airborne contaminants from entering the intake valves of the compressor.

Answer 11

Intake filter

Question 12

The compressor oil must be the type recommended by the __________ to maintain the life of the compressor and the warranty.

Answer 12

Manufacturer

Question 13

Limiting __________ in compressed air piping is of the utmost importance.

Answer 13

Condensation

Question 14

Another type of dryer involves the use of __________, or chemicals, to remove moisture from the control air.

Answer 14

Desiccant

Question 15

The __________ __________ is located in the piping between the compressor and the pressure reducing valve.

Answer 15

Moisture condenser

Question 16

The ___________ ___________ has been decreased in the system, thereby reducing the amount of water deposited throughout the system.

Answer 16

Air temperature

Question 17

Pneumatic controls are separated between ___________ and ___________ type control systems

Answer 17

HVAC and process

Question 18

The ___________ ___________ located on the outside wall at the ground floor would make maintenance and future renovations more accessible.

Answer 18

Compressor room

Question 19

For all pneumatic instrumentation systems, the ___________ ___________ ___________ is the major organization that writes and issues standards.

Answer 19

International Society of Automation

Question 20

A ___________ ___________ that has a ___________ float must react at the correct elevation to maintain the function of the process.

Answer 20

Level meter, float

Question 21

Precautions should be made when working moving equipment; ___________ and ___________ procedures should be followed.

Answer 21

Tag and lockout

Question 22

When working on plant sites, follow the ___________ ___________ and ___________ ___________. Generally the industry plants exceed the OH&S rules and they must be followed.

Answer 22

Written regulations and safety rules

Question 23

Consult the ___________ for relevant information on the material in the process lines.

Answer 23

MSDS

Question 24

When troubleshooting the sensing and measuring variables, you should be primarily concerned with the:

Answer 24

Primary element

Question 25

When a pressure gauge is located on the process piping, it is classified as:

Answer 25

Integral mounted

Question 26

A thermometer is really designed to measure:

Answer 26

Molecular movement

Question 27

The sensing element normally used in a pressure gauge is a:

Answer 27

Bourdon tube

Question 28

The thermoelectric pyrometer temperature uses:

Answer 28

DC millivolts

Question 29

Floats can control, indicate, or record events; this liquid level device is based on the laws of:

Answer 29

Buoyancy laws

Question 30

The only type of flow measuring device that accurately measures volume is the:

Answer 30

Positive displacement type

Question 31

When installing an orifice plate between a pair of orifice flanges, the stamped face is normally installed:

Answer 31

Upstream of the flow

Question 32

Which flow sensing device will handle more flow with less pressure drop?

Answer 32

Pitot tubes

Question 33

The type of meter that is mainly used as an indicating device is the:

Answer 33

Rota meter

Question 34

Moisture is introduced into the pneumatic control system from the:

Answer 34

Intake filter

Question 35

The air compressor is controlled by a:

Answer 35

Pressure switch

Question 36

The aftercooler is located:

Answer 36

Before the receiver

Question 37

Lubrication should remain in the:

Answer 37

Compressor

Question 38

The type of air drying technique that uses a cooling tower is a:

Answer 38

Moisture condenser

Question 39

The building type that would require the most rigid HVAC standards is a:

Answer 39

Hospital

Question 40

The primary noises transmitted from the compressor are caused by:

Answer 40

Vibration

Question 41

The type of piping or tubing found on large pneumatic instrumentation systems is:

Answer 41

Galvanized pipe

Question 42

Before filling and testing a system that contains float type meters, you should:

Answer 42

Install plugs

Question 43

Each control valve should have an:

Answer 43

ID tag