Heating

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Question 1

Heat is transferred via each of the following except _____.

A	condensation
B	radiation
C	convection
D	conduction

Question 2

One of the products of incomplete combustion is _____.

A	carbon monoxide
B	formaldehyde
C	carbon dioxide
D	sulfuric acid

Question 3

In a forced-air furnace, the air filter is normally located ____________.

A	at the return air inlet
B	in the ductwork
C	at the supply air outlet
D	between the burners and the heat exchangers

Question 4

The body loses heat less rapidly when the relative humidity is _____.

A	50 percent
B	constant
C	low
D	high

Question 5

In order for combustion to occur, there must be _____.

A	fuel, ignition, and aldehyde
B	fuel, ignition, oxygen, and heat exchangers
C	fuel, ignition, and oxygen
D	fuel, ignition, and carbon dioxide

Question 6

The fuel oil most likely to be used in a residential oil furnace is _____.

A	Grade 3
B	Grade 2
C	Grade 4
D	Grade 6

Question 7

It is acceptable to vent a gas appliance through a masonry chimney as long as _____.

A	a double-wall vent connector is used
B	a tile or metal liner of the correct size is used
C	the furnace is common-vented with another gas appliance
D	the chimney has a tile liner

Question 8

In a standing pilot, the thermocouple _____.

A	converts the heat from the pilot into an electrical current
B	turns the pilot off when the thermostat opens
C	turns off the pilot if the gas supply fails
D	ignites the fuel

Question 9

If too little primary air is supplied to a gas burner the flame will _____.

A	turn blue
B	turn green
C	turn yellow
D	lift away from the burner surface

Question 10

An automatic vent damper _____.

A	keeps heat from escaping through the flue
B	closes when the thermostat calls for heat
C	adds moisture to the flue gases
D	humidifies the conditioned space

Question 11

A device commonly used to check gas manifold pressure is a(n) _____.

A	altimeter
B	pressure regulator
C	manometer
D	thermometer

Question 12

In a pressure-type oil burner system, the fuel _____.

A	is squirted into the combustion chamber
B	forms a pool at the bottom of the combustion chamber, where it is ignited
C	is converted into a mist before it enters the combustion chamber
D	is distributed to the combustion chamber by a spinning cup

Question 13

The best spray angle for round or square combustion chambers is _____.

A	70 to 90 degrees
B	30 to 60 degrees
C	50 to 70 degrees
D	exactly 45 degrees

Question 14

A two-stage oil pump is used _____.

A	for installations where the oil tank is above the level of the burner
B	on high efficiency oil furnaces
C	when a two-pipe oil supply system is used
D	for installations where the oil tank is below the level of the burner

Question 15

In a gun-type oil burner, ignition is caused by _____.

A	a pilot flame
B	a thermocouple
C	an electric spark
D	intense heat on the surface of the electrodes

Question 16

Which of the following is true of a direct-drive fan?

A	The fan speed is altered only by changing the motor speed.
B	The speed of the fan is in direct proportion to the ratio of the pulley diameters.
C	The length of the motorshaft determines the speed of the fan.
D	There is a fixed pulley on the fan shaft and an adjustable pulley on the motor shaft.

Question 17

The hydronic heating system component that monitors water temperature in the boiler and controls the circulation of water is the _____.

A	zone control valve
B	aquastat
C	water level control
D	makeup water valve

Question 18

Which condition will cause the flame to lift off a gas burner surface?

A	Too much primary air
B	Too much secondary air
C	Too little secondary air
D	Too little primary air

Question 19

Which grade of fuel oil is used in vaporizing-type oil burners?

A	Grade 1
B	Grade 4
C	Grade 3
D	Grade 2

Question 20

pressure-type oil burner should burn with a _____ flame.

A	orange
B	blue
C	yellow
D	blue tipped with yellow

Question 21

Dilution air is

A	Air that mixes with the fuel for combustion
B	Air that is brought into a return air duct system
C	Air that mixes with combustion gases in a natural draft furnace
D	Air that mixes with combustion gases in an induced draft non condensing furnace

Question 22

Infiltration is

A	Air that is never allowed to mix with the combustion air
B	Air that is exhausted out of a gas fired appliance area
C	Air that is brought into tight constructed homes through a combustion air system
D	Air that is brought into loose constructed homes around windows and doors

Question 23

How is infiltration measured?

A	By cubic foot per minute
B	By foot per minute
C	By air changes per hour
D	By calculating the square footage of the home by a factor of .5

Question 24

How much combustion air is required for every one cubic foot of natural gas used on a gas fired appliance?

A	5 cu’
B	10 cu’
C	15 cu’
D	20 cu’

Question 25

How much dilution air is required for every one cubic foot of gas used on a natural draft appliance?

A	6 cu’
B	8 cu’
C	10 cu’
D	14 cu’

Question 26

Which statement is true?

A	A fan assisted draft furnace only requires 5 cu’ of combustion air for every 1 cu’ of natural gas
B	A fan assisted draft furnace does not use dilution air
C	A fan assisted draft furnace does not require combustion air
D	A fan assisted draft furnace only requires 5 cu” of combustion air for every 2 cu’ of natural gas

Question 27

What is a common cause of heat exchanger and vent system corrosion on an induced draft non condensing furnace?

A	Not enough dilution air for the vent system
B	Too much outdoor air brought in for combustion
C	Household chemicals
D	Not enough outdoor air brought in for combustion

Question 28

An unconfined space is

A	A space whose volume is greater than 50 cu’/1,000btuh of total input of all gas fired appliances
B	A space whose volume is less than 50 cu’/1,000btuh of total input of all gas fired appliances
C	A space whose volume is greater than 50 cu’/4,000btuh of total input of all gas fired appliances
D	A space whose volume is less than 50 cu’/4,000btuh of total input of all gas fired appliances

Question 29

Combustion air

A	Can be taken from an unconfined space if the construction of the home is tight
B	Can be taken from an unconfined space if the construction of the home is loose
C	Can be taken from an unconfined space only if a mechanical ventilation system is installed
D	Can never be taken from an unconfined space

Question 30

When introducing outdoor combustion air into an unconfined space

A	One 100 sq” opening is generally required
B	Two equal sized openings are required
C	Never place the openings near the ceiling
D	Never place the opening near the floor

Question 31

When introducing outdoor combustion air into an unconfined space

A	Each opening must have a total free area of at least 1 sq” per 1,000 btuh input and not less than 100 sq”
B	Each opening must have a total free area of at least 1 sq” per 2,000 btuh input and not less than 100sq”
C	Each opening must have a total free area of at least 1 sq” per 4,000 btuh input and not less than 100 sq”
D	Each opening must have a total free area of at least 1 sq” per 5,000 btuh input and not less than 100 sq”

Question 32

When horizontal ducts are used to introduce outdoor air into an unconfined space

A	The openings must be 1 sq” for every 1,000 btuh input and not less than 100 sq”
B	The openings must be 1 sq” for every 2,000 btuh input and not less than 100 sq”
C	The openings must be 1 sq” for every 5,000 btuh input and not less than 100 sq”
D	The openings must be 1 sq” for every 5,000 btuh input and not less than 100 sq”

Question 33

What is the total free area of a 10”X 15” combustion air opening used with a grill that has a 70% free area

A	70 sq”
B	105 sq”
C	120 sq”
D	150 sq”

Question 34

A confined space is

A	A space whose volume is greater than 50 cu’/1,000 btuh of total input of all gas fired appliances
B	A space whose volume is less than 50 cu’/1,000 btuh of total input of all gas fired appliances
C	A space whose volume is greater than 50 cu’/4,000 btuh of total input of all gas fired appliances
D	A space whose volume is less than 50 cu’/4,000 btuh of total input of all gas fired appliances

Question 35

When introducing combustion air into a confined space,

A	Two equal openings must be provided, within 12” of the floor
B	Two equal openings must be provided, within 12” of the ceiling
C	At least one opening must be provided near the ceiling or the floor
D	Two equal openings must be provided, one at or within 12” of the ceiling and the other at or within 12” of the floor

Question 36

When introducing indoor combustion air into a confined space,

A	Each opening must have a total free area of at least 1 sq” per 1,000 btuh input and not less than 100 sq”
B	Each opening must have a total free area of at least 1 sq” per 2,000 btuh input and not less than 100 sq”
C	Each opening must have a total free area of at least 1 sq” per 4,000 btuh input and not less than 100 sq”
D	Each opening must have a total free area of at least 1 sq” per 5,000 btuh input and not less than 100 sq”

Question 37

When horizontal ducts are used to introduce outdoor air into confined space.

A	The openings must be 1 sq” for every 1,000 btuh input and not less than 100 sq”
B	The openings must be 1 sq” for every 2,000 btuh input and not less than 100 sq”
C	The openings must be 1 sq” for every 4,000 btuh input and not less than 100 sq”
D	The openings must be 1 sq” for every 5,000 btuh input and not less than 100 sq”

Question 38

The minimum dimension of a horizontal duct that is used to introduce combustion air into a confined space must not be less than

A	1”
B	2”
C	3”
D	5”

Question 39

When a vertical duct used to introduce outdoor combustion air into a confined space, the opening must be

A	1 sq” for every 1,000 btuh total input and not less than 100 sq”
B	1 sq” for every 2,000 btuh total input and not less than 100 sq”
C	1 sq” for every 4,000 btuh total input and not less than 100 sq”
D	1 sq” for every 5,000 btuh total input and not less than 100 sq”

Question 40

When a vertical duct is used to introduce combustion air into a confined space, it must terminate

A	1’ above the floor
B	4’ above the floor
C	2’ below the ceiling
D	1’ below the ceiling

Question 41

What should never be allowed to mix in a confined space when installing a furnace?

A	The dilution with the combustion air
B	The supply with the return
C	The combustion with the supply and return air
D	The dilution and the exhaust air

Question 42

Direct vent high efficiency condensing furnaces

A	Must be vented according to the manufacturer’s recommendation only
B	Must be vented by using AGA vent tables only
C	Must use AGA vent tables and the manufacturer’s recommendation
D	Must never use polyvinyl chloride pipe for combustion air

Question 43

Most direct vent high efficiency condensing furnaces

A	Only allow for vertical venting
B	Only allow for horizontal venting
C	Allow for vertical and horizontal venting
D	Must be vented into a chimney whatever possible

Question 44

When installing combustion air for a direct vent high efficiency condensing furnace, the combustion air and vent pipes must be supported at least every

A	5’
B	10’
C	15’
D	20’

Question 45

The combustion air and vent pipes used on a direct vent high efficiency furnace must be located

A	At two different areas to prevent the system from operating under the same air pressure zones
B	At two different areas to prevent the system from operating under different air pressure zones
C	Near the same area to prevent the system from operating under the same air pressure zones
D	Near the same area to prevent the system from operating under different air pressure zones

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Heating

Heating

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