Question 1

What type of heating distributes hot water through a series of continual tubes placed in the floor system, turning the whole floor system into a radiator?&#10;A) series-loop&#10;B) one-pipe&#10;C) two-pipe&#10;D) radiant

Accepted Answer

The type of heating described is radiant heating, which uses a series of continual tubes in the floor system to turn the whole floor into a radiator. A, B, and C do not accurately describe this type of heating.

Question 2

Loose-fill insulation is made from plastic foams and formed into sheets.

Accepted Answer

Loose-fill insulation is typically made from materials such as fiberglass, cellulose, or mineral wool, not plastic foams. It is also not formed into sheets, but rather blown or poured into cavities.

Question 3

The ____ of a material provides a uniform method to rate the resistance of heat flow through it.&#10;A) D-value&#10;B) R-value&#10;C) U-value&#10;D) A-value

Accepted Answer

The R-value is a measure of thermal resistance, indicating how well a material resists heat flow. It is used as a uniform method to rate the resistance of heat flow through a material. The higher the R-value, the greater the resistance to heat flow.

Question 4

The series-loop system is a continuous loop of pipes containing hot water.

Accepted Answer

In a series-loop system, hot water flows continuously in a loop of interconnected pipes.

Question 5

On the cooling cycle, a heat-pump acts as a _____.&#10;A) dehumidifier&#10;B) humidifier&#10;C) geothermal reservoir&#10;D) plenum

Accepted Answer

During the cooling cycle, a heat-pump removes heat from the indoor air and transfers it outdoors, which results in lowering the temperature of the indoor air. As a part of this process, the heat-pump also removes the moisture or humidity from the indoor air, which acts as a dehumidifier. Therefore, choice A is the correct answer. Choices B, C, and D are incorrect because the heat-pump does not add humidity, act as a geothermal reservoir or a plenum during the cooling cycle.

Question 6

What type of system provides even heat in a residence by circulating hot water to radiators, finned tubes, or convectors?&#10;A) wall-mounted&#10;B) hydronic&#10;C) baseboard&#10;D) zone-control

Accepted Answer

A hydronic system circulates hot water to radiators, finned tubes, or convectors in order to provide even heat in a residence. Wall-mounted, baseboard, and zone-control are not specific enough to describe the type of heating system.

Question 7

Which of the following expresses the relationship between R-value and U-value?&#10;A) U-value is the same as R-value&#10;B) U-value is the reciprocal of R-value&#10;C) R-value is U-value squared&#10;D) R-value is half U-value

Accepted Answer

The relationship between R-value and U-value is reciprocal. U-value measures the rate of heat transfer through a material, while R-value measures the resistance of a material to heat transfer. The higher the R-value, the lower the U-value, indicating better insulation. The U-value is the reciprocal of the R-value, meaning that U = 1/R.

Question 8

What type of system heats air in a central furnace and then uses a fan to send it through ducts to distribute heated air to diffusers placed throughout the residence?&#10;A) two-pipe&#10;B) series-loop&#10;C) forced-air&#10;D) plenum

Accepted Answer

Forced-air systems use a central furnace to heat the air, which is then distributed through ducts using a fan. This is a common type of heating system in residential buildings. The other options (two-pipe, series-loop, and plenum) do not involve heating air and distributing it through ducts.

Question 9

A _____ is a heat recovery and ventilation device that pulls polluted air from within the building envelope and transfers the heat by pulling fresh air into the house.&#10;A) trombe wall&#10;B) steam-heating unit&#10;C) air-to-air heat exchanger&#10;D) diffuser

Accepted Answer

A trombe wall is a passive solar heating system where sunlight is absorbed by a thermal mass wall and then radiated into the living space. A steam-heating unit is a type of heating system that uses steam to transfer heat from a central boiler to various parts of a building. A diffuser is a device used to distribute air from an HVAC system. The device described in the question is an air-to-air heat exchanger, also known as a heat recovery ventilator (HRV) or energy recovery ventilator (ERV). It is used to improve indoor air quality by ventilating a space while recovering the heat energy from the exhausted air. The fresh air brought in is preheated by the outgoing stale air, reducing energy consumption.

Question 10

Doors and windows lose heat by air ____.&#10;A) insulation&#10;B) convection&#10;C) radiation&#10;D) infiltration

Accepted Answer

Infiltration refers to air escaping through small cracks or gaps in doors and windows, causing heat loss. Insulation reduces heat loss but does not involve the movement of air. Convection and radiation also play a role in heat loss but are not specific to doors and windows.

Question 11

The standard unit of measurement for heat production or loss is the ____&#10;A) watt&#10;B) volt&#10;C) British thermal unit&#10;D) joule

Accepted Answer

The answer of The standard unit of measurement for heat...

Question 12

With ____, heat travels from a heated surface to the molecules of liquids or gases surrounding that surface.&#10;A) rigid insulation&#10;B) batts and blanket insulation&#10;C) loose-fill insulation&#10;D) convection

Accepted Answer

The answer of With ____, heat travels from a heated...

Question 13

Heat travels by radiation, convection, and conduction.

Accepted Answer

The answer of Heat travels by radiation, convection, and conduction....

Question 14

Using the indirect-gain method, the inside of a building is directly heated by the sun's rays as they pass through large areas of south-facing glass.

Accepted Answer

The answer of Using the indirect-gain method, the inside of...

Question 15

Materials that transfer heat easily are known as conductors.

Accepted Answer

The answer of Materials that transfer heat easily are known...

Deck 15: Comfort Control Systems