Plc 1 Test 4

Front 1

What is radiation?

Back 1

A way thermal energy can be transferred through a vacuum.

Front 2

What is a way thermal energy can be transferred through a vacuum?

Back 2

Radiation.

Front 3

What is a process where heat is transferred through a solid?

Back 3

Conduction.

Front 4

Are seebeck voltages big or small?

Back 4

Real small.

Front 5

What is the seebeck effect?

Back 5

Front 6

What's a sheath?

Back 6

Material that surrounds the sensing element.

Front 7

What's a calorie?

Back 7

Metric unit of work for heat energy.

Front 8

What's a thermowell good for?

Back 8

Replacing a probe without shutting down a system, and protects the probe.

Front 9

What does a thermowell contain?

Back 9

The probe.

Front 10

What's a thermopile?

Back 10

A group of thermocouples connected together in series.

Front 11

What's a thermopile sensitive to?

Back 11

Small temperature changes.

Front 12

What is BTU?

Back 12

British thermal unit.

Front 13

What is the transfer of heat through fluids?

Back 13

Convection.

Front 14

What is BTU? Not acronym.

Back 14

Standard unit of work for heat energy.

Front 15

What is forced convection?

Back 15

Forcing temperatures through fluid from one area to another. With like a fan.

Front 16

What's thermodynamics?

Back 16

Thermal movement from hot to cold.

Front 17

What's a pyrometer?

Back 17

Detects temperature based in electromagnetic radiation. Non contact.

Front 18

What is absolute zero?

Back 18

The absence of heat. Zero Kelvin.

Front 19

What are the units for measuring temperature?

Back 19

Fahrenheit, Celsius, and Kelvin.

Front 20

What are the units for measuring heat energy?

Back 20

BTU and the Calorie

Front 21

What's the symbol for a normally closed temperature switch?

Back 21

Front 22

What are the four types of media a thermocouple can be used with?

Back 22

Solid, liquid, and gas, and vacuum.

Front 23

What size is a thermocouple?

Back 23

Very small.

Front 24

As the diameter of a thermocouple gets smaller, what happens to its temperature rating?

Back 24

Goes down.

Front 25

What's used to designate the different types of thermocouples?

Back 25

Letters.

Front 26

How to extend the lead wires on a thermocouple?

Back 26

Use extension grade wires.

Front 27

When extending the lead wires in thermocouples, why should you use extension grade wires?

Back 27

So you're connecting to metal of the same type.

Front 28

On an ANSI J type thermocouple, what color is the negative wire?

Back 28

Red.

Front 29

What's an exposed thermocouple junction have? (good and bad)

Back 29

Fast response time, most easily damaged.

Front 30

What's an ungrounded thermocouple junction have? (good, good, and bad)

Back 30

Protected, electrically isolated, slow response time.

Front 31

What's a grounded thermocouple junction have? (good, good, and bad)

Back 31

Medium response time, protected, and susceptible to electrical noise.

Front 32

What does RTD stand for?

Back 32

Resistance temperature detectors.

Front 33

What is the actual RTD temperature sensing unit called?

Back 33

The element.

Front 34

Which RTD probe lead wire configuration provides the most precise temperature measurement?

Back 34

Style three. Four wire. Black Black Red red.

Front 35

What is the most common type of RTD lead wire configuration?

Back 35

Style two. Three wire. Black black red.

Front 36

What is a common RTD resistance?

Back 36

100 ohms. Pt100.

Front 37

What's a thermocouple? (good, bad)

Back 37

Least sensitive, widest range.

Front 38

What are characteristics of the RTD? (good, good, bad)

Back 38

Interchangeable, moderately sensitive, but glass type can't handle vibrations.

Front 39

What are characteristics of the thermistor? (good, bad)

Back 39

Very sensitive, narrow temperature range.

Front 40

Does a thermistor have a positive or a negative temperature coefficient?

Back 40

Negative.

Front 41

When selecting a thermocouple, what are you looking for?

Back 41

Temperature, media compatibility, pressure, response time, and junction type.

Front 42

Bigger diameter of probe means what? Except for?

Back 42

Longer response time. Exposed.

Front 43

Title these.

Back 43

Exposed, grounded, exposed, ungrounded.

Front 44

What are the three types of probes?

Back 44

Exposed, grounded, ungrounded.

Front 45

What's the name of the electronic circuit that RTDs and thermistors are put in?

Back 45

Wheatstone bridge.

Front 46

What's the color of the IEC thermocouple negative wire lead color?

Back 46

White.

Front 47

What are types of visual temperature indicators?

Back 47

Thermometer, gas or liquid inside. Bimetallic strip. Crayons.

Front 48

How do you convert fahrenheit to Celsius?

Back 48

(F-32)x(5/9)

Front 49

Convert Celsius to fahrenheit?

Back 49

F = (Cx(9/5)) + 32

Front 50

What temperature is the RTD resistance value based on?

Back 50

Ice point. 0 degrees Celsius.

Front 51

What is RTD used as in a single phase AC motor?

Back 51

A centrifugal switch. Heats up when motor runs, because of this resistance goes up, which eliminates current going to start motor.

Front 52

Does an RTD have a positive or negative temp coefficient?

Back 52

Positive.

Front 53

How do you connect a two wire RTD to a three wire temperature controller input connection?

Back 53

Like this. Jumper wire.

Front 54

What is a pyrometer?

Back 54

Temp gun! Silly

Front 55

What's a pyrometer used for?

Back 55

Non contact troubleshooting of electrical and mechanical things.

Front 56

Smaller diameter of probe means what for response them?

Back 56

Shorter response time.

Front 57

Probe response time vs shield diameter?

Back 57

Smaller sheath diameter, faster response time. Vice versa.

Front 58

Thermocouple probe temperature limit vs sheath diameter?

Back 58

Smaller sheath diameter = smaller temperature limit. Vice versa.

Front 59

Thermocouple voltage vs temperature response curve for different types of thermocouples?

Back 59

Different types of thermocouples produce different curves with different proportions of temperature and range.

Front 60

What's the electromechanical symbol for a thermocouple?

Back 60

Front 61

What's thermal shunting?

Back 61

Altering the measurement temperature by inserting a measuring device.

Front 62

Look over that thermocouple graph.

Back 62

Good girl.

Front 63

What does a hygrometer measure?

Back 63

Relative humidity.

Front 64

What does a psychrometer measure?

Back 64

A combination of humidity and temperature, called dewpoint.

Front 65

Small RTD means what for response time?

Back 65

Fast response time.

Front 66

What does a large RTD mean?

Back 66

Slow response time.