[ILM] 102A

Question 1

absolute presssure

Answer 1

A system of pressure measurement with a starting point in a perfect vacuum

0 psig = 14.7 psia

Question 2

absolute temperature

Answer 2

0R == -460F

Question 3

adiabatic compression

Answer 3

The compression of refrigerant gas without removing or adding heat content

Question 4

ambient temperature

Answer 4

The average temp of the media that surrounds a point

Question 5

BTU (British Thermal Unit)

Answer 5

the amount of heat required to raise the temp of 1lb of water by 1F

Question 6

enthalpy

Answer 6

The heat in 1 lb or kg of a substance from a zero-base point and at -40F

Question 7

entropy

Answer 7

A measurement of energy transfer where the energy is moved but not used to do work

Question 8

head, static pressure

Answer 8

Fluid pressure based on the height of a column of fluid

Question 9

IDLH

Answer 9

Immediately Dangerous to Life or Health

Question 10

laminar flow

Answer 10

The smooth undisturbed flow of a fluid within a duct or pipe

Question 11

turbulent flow

Answer 11

The chaotic flow of a fluid within a duct or pipe

Question 12

latent heat

Answer 12

Heat gained or lost with no temperature change

Question 13

sublimation

Answer 13

a change of state from a solid directly to a vapour without having a liquid state (승화)

Question 14

superheating

Answer 14

adding sensible heat to a vapour at its evaporation pressure

Question 15

subcooling

Answer 15

removing heat from a liquid at its condensation pressure

Question 16

desuperheating

Answer 16

sensible heat is removed from a vapour or gas while it remains at its saturation or boiling pressure

Question 17

Threshold limit value (TLV)

Answer 17

The refrigerant concentration in air for a normal 8 hr workday and a 40 hr workweek to which nearly all workers may be repeatedly exposed, day-after-day, without adverse effect

Question 18

1 ton of refrigeration ==

Answer 18

288,000 Btu/24hrs
12,000 Btu/hr
200 Btu/min

Question 19

Sensible heat

Answer 19

heat we can sense by touch

Question 20

Specific heat

Answer 20

the amount of heat required to change 1lb of a substance by 1F

Question 21

Heat is

Answer 21

energy in the form of molecular motion

Question 22

subcooling types

Answer 22

1. an increase in the subcooling of liquid refrigerant results in a decrease of sensible heat in the refrigerant
2. a decrease in sensible heat results in a decrease in the amount of heat contained by the refrigerant
3. a decrease in heat results in an increased capacity in the cooling section

Question 23

The greater the temp difference between two objects,

Answer 23

the faster heat transfers

Question 24

Conduction

Answer 24

solid

Question 25

Convection

Answer 25

liquid or gas

Question 26

Radiation

Answer 26

purely gas

Question 27

Thermodynamics

Answer 27

study of changing heat energy into mechanical energy and mechanical energy into heat energy

Question 28

The first law of thermodynamics states

Answer 28

energy cannot be created or destroyed

Question 29

The second law of thermodynamics states

Answer 29

heat energy moves from a zone of high heat to a zone of low heat high heat -> low heat

Question 30

liquid water (specific heat value) ice (specific heat value) steam (specific heat value)

Answer 30

1.00 btu/lb/F 0.5 0.46

Question 31

Sensible heat

Answer 31

a gain or loss of heat that is indicated by a rise or fall in temp

Question 32

Latent heat

Answer 32

a gain or loss of heat that does not register a temp change

Question 33

Total heat

Answer 33

the sum of latent heat and sensible heat

Question 34

Q =

Answer 34

m x c x T Q = Quantity of Heat m = mass c = specific heat T = temperature difference

Question 35

Temperature

Answer 35

the average amount of molecular motion in a substance