Finals

Question 1

which direction does heat always travel

Answer 1

warm to cold

Question 2

how is a principal ventilation fan sized

Answer 2

number of bedrooms

Question 3

define dew point

Answer 3

temperature at which moisture in the air begins to condense

Question 4

what happens when air is heated

Answer 4

relative humidity decreases

Question 5

what is not a type of hrv heat exchanger core

Answer 5

Pannel

Question 6

why do we set a lower relative humidity in our home when the temperature drops

Answer 6

to prevent condensation

Question 7

how do we measure intensity of heat

Answer 7

degrees measured by a thermometer

Question 8

absolute zero is -273c, what else is it?

Answer 8

0 degrees kelvin

Question 9

what method of heat transfer uses natural motion of a fluid medium

Answer 9

convection

Question 10

one British thermal unit will raise?

Answer 10

55 cubic feet of air one degree farenheight

Question 11

when does heat stop flowing between objects

Answer 11

when they reach the same temperature

Question 12

what method of heat transfer requires physical contact between two bodies to occur

Answer 12

conduction

Question 13

what is not a function of a make up air system

Answer 13

Control temperature of a home

Question 14

a grain is a measure of

Answer 14

weight

Question 15

what effects does low humidity have on people

Answer 15

sore throats and dry skin

Question 16

sensible heat is

Answer 16

The amount of heat required to produce a change in temperature of a substance, but not a change of state.

Question 17

Heat transfer by Radiation can be described as

Answer 17

The transfer of heat by energy waves similar to light waves.

Question 18

hrvs can recover what percent of heat loss

Answer 18

85

Question 19

what was the source of ventilation in the 70s

Answer 19

leakage

Question 20

how many cfms for a master bedroom

Answer 20

20

Question 21

what is heat

Answer 21

energy

Question 22

how do we measure the volume of heat

Answer 22

btus

Question 23

what is not a type of furnace

Answer 23

side boy

Question 24

what are the 2 most common heating fuels in Alberta

Answer 24

natural gas and propane

Question 25

what separates the air that circulates in a house from the products of combustion

Answer 25

heat exchanger

Question 26

what is the efficiency of a furnace that has 15% of the heat it produces going up the chimney

Answer 26

85 perecent

Question 27

what is the purpose of an inducer motor

Answer 27

to regulate combustion air

Question 28

a furnace that condenses water vapour in its flue gases is known as what type of furnace

Answer 28

high efficiency

Question 29

why do we filter the air upstream of the furnace

Answer 29

to protect the equiptmentb

Question 30

what is the recommended humidity in the home

Answer 30

30-55 percent

Question 31

a humidistat is activated by what

Answer 31

moisture

Question 32

what does cfm measure

Answer 32

amount of air a fan will exhaust or supply in one minute

Question 33

why do we reduce our duct in an extended plenum system

Answer 33

to keep pressure levels at what is required

Question 34

what was the method of supplying combustion air for appliances prior to 1976

Answer 34

leakage

Question 35

Special fresh air ventilation fittings must be used to connect the fresh air duct to the return trunk duct.

Answer 35

no

Question 36

the combustion air termination is used to...

Answer 36

keep cold air from dropping into the furnace room

Question 37

Both factory built chimneys and vents have a system of parts that are _____ by a recognized testing agency.

Answer 37

certified

Question 38

Installations requiring you to run forced air heating under the concrete slab are known as:

Answer 38

under slab heating

Question 39

roofjacks used on dryer vents are available without bird screens

Answer 39

true

Question 40

the fitting used to connect the return air branch to the main duct is

Answer 40

nothing

Question 41

The material used for venting of the fan to the outside must be metal duct with insulation and a vapour barrier, such as foilback insulation.

Answer 41

false

Question 42

Furnaces require air to fuel the fire inside of them. This is called _____ air.

Answer 42

combustion

Question 43

The entire underslab ducting system must slope (back to/level/away from) the furnace.

Answer 43

back to

Question 44

When a return air branch run is finished on the bottom with a drywall ceiling, the bottom of the branch run is finished with:

Answer 44

drywall

Question 45

_____ is the uncontrolled leakage of air from a building.

Answer 45

exfiltration

Question 46

Type L-vent construction consists of:

Answer 46

an outer casing of Galvalume® / airspace / inner liner of stainless steel.

Question 47

The ductwork coming off the plenum for underground heating installations will be round for strength and to make it easier to seal against moisture in the ground.

Answer 47

true

Question 48

a 14x8 return air grill covers a 14x8 hole

Answer 48

true

Question 49

what's the heart of the hvac system

Answer 49

air recirculation fan

Question 50

The air is ______ from the central heating or cooling unit by the supply air system.

Answer 50

distributed

Question 51

he return air part of an HVAC system consists of the parts to bring air back from the _____ to the furnace.

Answer 51

occupied space

Question 52

Rectangular duct takeoffs include all of the following except:

Answer 52

saddle takeoffs

Question 53

duct ratio should not exceed

Answer 53

4 to 1