Hvac Heating Ventilation Air Conditioning

Front 1

High-efficiency condensing HVAC systems produce excessive

Back 1

Condensate

Front 2

__________ is an effective means of inspecting for water leaks and moisture problems

Back 2

Thermography

(thermal imaging are examples of infrared imaging in science)

Thermography is a test that uses an infrared camera to detect heat patterns and blood flow in the body tissue. Test for breast cancer

Front 3

A home that has a fuel fire heating system requires____________

Back 3

Venting of its combustion gases and buy products to the outside

Front 4

Heat moves from the _____ body, and the ______ body absorbs it.

Back 4

Warmer, colder

Front 5

He can move from one body to another by

Back 5

Radiation

Front 6

Ventilation became important during ______________ to protect workers safety and increase their productivity

Back 6

Industrial revolution

Front 7

Radiation is the transfer of heat energy by

Back 7

Electromagnetic wave motion

Front 8

Heat transferred through electromagnetic wave happens via

Back 8

Radiation

Front 9

Heat is transferred

Back 9

In direct rays

Front 10

Heat transferred within a gas or liquid happen via

Back 10

Convection

Convection is the process of heat transfer from one location to the next by the movement of fluid. The moving fluid carries energy with it

Front 11

Heat transferred through a solid happens via

Back 11

Conduction

Is the process by which heat energy is transferred through a collision between neighboring Atoms or molecules

Front 12

The use of air conditioning or simple cooling of the air became widespread after

Back 12

1945

Front 13

Air-conditioning systems do not simply cool the air, but they actually condition it by controlling the airs

Back 13

Moisture content,

temperature,

movement

Front 14

Heat moves from one body to another by the 3 following ways

Back 14

Radiation, conduction and convection

Front 15

Servants and slaves fanning royalty using large palm fronds and feathers is an early example of

Back 15

Ventilation

Front 16

People have been attempting to control heat and ventilation since

Back 16

Prehistoric times

Front 17

Steam is considered a heat conveying medium

T/F

Back 17

True

Front 18

Natural Gass has no color or odor, and _________ toxic

Back 18

Is not

Front 19

Natural gas is __________ air

Back 19

Lighter than

Front 20

There are ___________ types of burners relative to the draft

Back 20

Three

Front 21

The lack of delusion air may cause a condition of ___________ at the furnace

Back 21

Backdraft

Back drive occurs when the combustion gases are not drafting or rising up to the chimney but are, instead, coming backward into the living area of the building. This is a hazardous situation, since carbon monoxide could be entering the dwelling.

Front 22

What is a heat-conveying medium

Back 22

The heat conveying medium is what carries the heat from the source to the enclosure being heated

Front 23

What is dilution air

Back 23

Draft air for a furnace

Front 24

Burning Natural Gass with oxygen yields carbon dioxide, water vapor, and ________

Back 24

Heat

Front 25

There are ____________ types of burners relative to the draft

Back 25

Three

Front 26

____________ Refers to the flow of gases through the heat generating equipment

Back 26

Draft

Front 27

What is an air handler?

Back 27

An air handler contains the components that move the air through your home, called the blower. Usually works with both the heating and cooling component of your HVAC system.

Front 28

Most heating systems can be categorized in _______ ways

Back 28

Four

Front 29

Return air must not be taken from a closet, bathroom, toilet room, kitchen, garage, mechanical room, boiler room, furnace room, or unconditioned attic.

T/F

Back 29

True

Front 30

What is a damper?

Back 30

A damper is advised to use to alter the volume of air passing through a confined cross-section by changing the size of the cross-sectional area

Front 31

Round or square supply ducts that are connected to and branch off the extended duct are called

Back 31

Side takeoff

Front 32

The warm air in a gravity warm air heating system rises up through warm air ducks or pipes that are also known as

Back 32

Stacks

Front 33

The efficiency of the air circulation in a house with a gravity warm air heating system depends on the temperature difference between the warm air _________ and the cool air _____________.

Back 33

Rising ....... falling

Front 34

In a forced warm-air heating system the cool air_______.

Back 34

Returns through the docks and back to the furnace, where it is reheated.

Front 35

What is a thermocouple?

Back 35

A device that senses heat. It’s used in gas furnace is having a standing pilot light. It determines whether the pilot flame is lit before the main gas valve is open to supply gas to the burners.

Front 36

What is a fan and limit control?

Back 36

A safety device. It controls the operation of the furnace within the temperature range, usually between 80° and 150°.

It will shut the gas off, if it gets too hot.

Front 37

If the heating system is a high-efficiency, gas fired furnace, then the heating conveying medium is

Back 37

Air

Front 38

The __________ of the heating system can be cited to distinguish one heating system from another

Back 38

Efficiency and capacity

Front 39

There are basically ________ types of heating systems

Back 39

Four

Front 40

What are the basic four types of heating systems

Back 40

Furnace 15-30 yrs

heat pump 15 yrs

ductless mini split heat pump 20 yrs

boilers 15-30 yrs

Front 41

Gas furnace components

Back 41

Thermostat

furnace control

heat exchanger

gas burners

ignition system

blower fan

and air filter

Front 42

A _____________ is the temperature below which the water vapor contained in the flu gas will turn into condensation

Back 42

Dewpoint temperature

Front 43

If combustion air is in adequately supply to the gas furnace, ________________ will be produced

Back 43

Carbon monoxide

Front 44

In conventional gas furnaces with a natural draft, the _____________[ air is mixed with the gas initially for combustion at the burners

Back 44

Primary

Front 45

High-efficiency furnaces should not be vented into a chimney because?

Back 45

The exhaust gases from a high-efficiency heating system are too cool to create enough chimney draft. Call gas as well condense inside the chimney and cause damage

Front 46

PVC pipe venting needs a slop of what?

Back 46

1/4 inch for linear foot is recommended. The pipe should be slow down and toward the furnace or stopped up away from the furnace.

Front 47

The gas furnace heating system should be inspected by a qualified service technician every ___________

Back 47

Year

Front 48

The appropriate BTU for a furnace is determined by _____________________

Back 48

The amount of heat the unit needs to produce in order to replace heat loss.

Front 49

US government has established a minimum rating for furnaces of

Back 49

78%

Front 50

Steady state efficiency measures how efficiently a furnace

Back 50

Converts fuel to heat

Front 51

The energy efficiency of a natural gas furnace is measured by its _________ rating

Back 51

AFUE

Front 52

A thermocouple is used in gas furnaces that have a(n)

Back 52

Standing-pilot light

Front 53

A mid efficiency gas furnace pilot light

Back 53

Is shut off when the furnace is not in operation

Front 54

Cold air is never created in a gas compression air conditioning system, but instead, _____________ is transferred from one place to another

Back 54

Heat

Front 55

There may be at least ___________ heat exchangers inside a high-efficiency furnace

Back 55

Two

Front 56

The older gas furnaces have a ____________ pilot light that is always burning

Back 56

Standing

Front 57

Steady-state efficiency measures how efficiently a furnace ________

Back 57

Converts fuel to heat

Front 58

Pressure relief valves on steam boiler systems should release at what psi

Back 58

15 PSI

Front 59

One cubic foot of water at 68° weighs about _______ pounds

Back 59

62 lbs

Front 60

A conventional oil furnace with a cast iron burner likely has a AFUE rating of

Back 60

60%

Front 61

At the burner nozzle of The gun assembly for an oil furnace

Back 61

Fuel is combined with air

Front 62

A stack relay senses _______ instead of ______

Back 62

Heat......light

Front 63

Burning Natural Gass creates

Back 63

Water (vapor) and carbon dioxide

Front 64

A hot water system that supplies hot water at a temperature higher than ________ is referred to as a high temperature system

Back 64

250°F

Front 65

A hot water system that supplies hot water at a temperature higher than ________ is referred to as a high temperature system

Back 65

250°F

Front 66

There are basically two types of steam heating systems

Back 66

Low pressure and high pressure

Front 67

As hot gas is cool, they release a lot of heat energy as they change their state from __________

Back 67

Gas to a liquid

Front 68

What is a heat pump?

Back 68

A heat pump is an electrically powered system that has a reversible cycle refrigeration system that is capable of both heating and cooling the interior area of a building

Front 69

What psi do most steam boilers run at?

Back 69

2PSI

Front 70

What psi do most steam boilers run at?

Back 70

2PSI

Front 71

What psi do most hot water boilers operate at?

Back 71

12 to 15 PSI

Front 72

What does a Hartford Loop do on a steam heating system.

Back 72

It prevents total loss of water from the boiler if there is a water leak in

Front 73

What is SEER

Back 73

Seasonal energy efficiency ratio.

Front 74

In a typical residential air-conditioning system the _____________ absorbs the heat energy from the air passing Through it, and transfers the heat energy from the passing air to the refrigerant moving inside it

Back 74

Evaporator

Front 75

Gas compression cooling involves the compression and ___________ a refrigerant gas and the transfer of heat

Back 75

Expansion

Front 76

According to the modern standards, air conditioning condensing units and heat pump units should have a readily accessible electrical disconnect within _________ of the unit

Back 76

Sight

Front 77

The ______________ is located inside the outdoor condenser unit and receive the low-pressure refrigerant vapor through the suction line, and compresses or squeezes it into a small volume at a high pressure

Back 77

Compressor

Front 78

How much clearance do you need in front of a electric furnace

Back 78

24x30 inches

Front 79

A hot water PTR is suppose to release at 150 PSI and 210 degrees

Back 79

150 PSI

210 degrees