Temperature and Temperature Measuring Devices

Question 1

What is heat

Answer 1

transfer of kinetic energy from one object or medium to another

Question 2

Temperature

Answer 2

degree of hotness or coldness as measured by a thermometer with a numerical scale

it is a process variable

Question 3

Molecular motion creates what

Answer 3

thermal energy

Question 4

Thermodynamics

Answer 4

molecular movement from hot to cold

Question 5

What is happening at absolute zero

Answer 5

there is no kinetic motion
the molecules have completely stopped moving

Question 6

Celsius temp at which water freezes

Answer 6

Zero

Question 7

Fahrenheit temp at which water freezes

Answer 7

32

Question 8

Celsius temp at which water boils

Answer 8

100

Question 9

Fahrenheit temp at which water boils

Answer 9

212

Question 10

How are thermometers classified

Answer 10

by the way they respond to a measurement

Question 11

Two classifications of thermometers

Answer 11

Mechanical
Electrical

Question 12

How do mechanical temperature devices respond to temperature

Answer 12

by movement

Question 13

List some expansion devices

Answer 13

liquid in glass
filled thermal systems
bimetallic devices

Question 14

Give examples of electrical sensors

Answer 14

thermocouples
temperature resistance devices (RTDs)
thermistors
semiconductors

Question 15

List some non contact devices

Answer 15

pyrometers

Question 16

List advantages of liquid in glass thermometers

Answer 16

stable
accurate read
good calibration standard
read directly

Question 17

Temperature range of liquid in glass thermometers depends on

Answer 17

filling liquid
type of glass
construction

Question 18

Accuracy of liquid thermometers depends on

Answer 18

scale division
range
parallax error

Question 19

What forms the basis of modern thermocouple technology

Answer 19

The Seebeck effect

Question 20

What is the Seebeck Effect

Answer 20

If two wires made of dissimilar metals are joined at both ends and one of the junctions is heated, a current will flow through the wires

Question 21

Cold junction

Answer 21

the unheated end

Question 22

Seebeck voltage

Answer 22

voltage that appears across the open ends of the wires when a circuit is open at the cold junction

Question 23

Hot junction

Answer 23

the heated end

Question 24

Thermopile

Answer 24

electronic device that converts thermal energy into electrical energy

Question 25

Types of alloys found in thermocouples

Answer 25

Constantan
Chromel
Alumel

Question 26

Constantan

Answer 26

Copper-Nickle alloy

Question 27

Chromel

Answer 27

Nickel-Chromium alloy

Question 28

Alumel

Answer 28

Nickel-aluminum
Manganese-sllicon