Design Principles Study Guide

The deflectors in registers are stationary and immovable, maintaining a set direction of airflow. Select one: True False

False

The overall size of a supply outlet determines a fixture's capacity. Select one: True False

False

The space between a false ceiling and a real ceiling may be used as a return air plenum. Select one: True False

True

The standard for measurement accuracy in American construction is 1/16². Select one: True False

True

When installing a damper, it is helpful to draw a line on the end of the shaft that extends out of the duct to show damper position. Select one: True False

True

When moving cooled air as opposed to moving warmed air, a 30% to 50% airflow increase is usually used. Select one: True False

True

When sensible heat is removed from air, there is a decrease in dry-bulb temperature. Select one: True False

True

If there is more return air than supply air in a room, the room will have a ____ pressure. Select one: a. negative b. positive c. vacuum d. None of the above.

a. negative

Diffusers in air distribution systems ____. Select one: a. spread the air leaving the duct more uniformly than registers b. are best used on the return side of the duct system c. deliver a narrow stream of air d. are specifically used in round ducts

a. spread the air leaving the duct more uniformly than registers

Extension lines are placed at the bottom of the symbol sheet. Select one: True False

False

In a VAV system, the opening and closing of dampers is based on a room's air pressure. Select one: True False

False

Increasing the static pressure against which a fan must operate increases the amount of airflow delivered by the fan. Select one: True False

False

Residential duct sizing and damper settings must prevent air from traveling too slowly to prevent noise in the system. Select one: True False

False

A butterfly damper is used primarily in square or rectangular ducts to restrict or completely shut off airflow to a room or zone. Select one: True False

False

A decrease of dry-bulb temperature occurs when sensible heat is added into air. Select one: True False

False

A multiple-blade damper is used primarily in round ducts to control airflow. Select one: True False

False

An intermittent forced air system provides a more constant temperature in rooms than a continuous blower system. Select one: True False

False

As its temperature drops or its pressure rises, air expands to fill a greater space. Select one: True False

False

As relative humidity decreases, each pound of air will occupy a greater space. Select one: True False

False

Cold air holds more moisture than warm air. Select one: True False

False

Ducts should be installed in the end of a plenum for balanced airflow. Select one: True False

False

Symbols are used to represent building materials on a construction drawing. Select one: True False

True

Locating an air handler in a central location minimizes the lengths of the longest supply and return ducts. Select one: True False

True

Proper functioning of a heating or cooling system depends on the duct sizes and damper settings. Select one: True False

True

Radial flow fans may be directly driven by the fan motor or driven by a belt and pulley system. Select one: True False

True

Registers that pass from unconditioned spaces into conditioned spaces can be sealed to the drywall or subfloor to reduce heat leakage. Select one: True False

True

Return duct inlets should be located at the farthest distance from the supply duct outlets. Select one: True False

True

Fresh air intakes are especially important in newer construction or in buildings that have been extensively insulated and weatherproofed. Select one: True False

True

Heat is released when water vapor condenses. Select one: True False

True

Ideally, return air ducts would be located both near the floor and the ceiling. Select one: True False

True

A cubic foot of air warmed by a standard heating system will change room temperature more than a cubic foot of air cooled by a standard cooling system. Select one: True False

True

Air circulation depends on the velocity of the air moving through the supply outlets. Select one: True False

True

Break lines indicate that a portion of the object has been omitted. Select one: True False

True

Fabric joints can be used to absorb noise caused by the expansion and contraction movements of metal ducts. Select one: True False

True

The definition of a line that has an arrow at one end and a text note at the other is a ____. Select one: a. leader b. glossary line c. reference hatch d. footnote line

a. leader

____ lines are used to separate the various portions of the drawing such as the title block, revision block, and notes. Select one: a. Border b. Property c. Center d. Hidden

a. Border

The basic unit of linear measure in the metric system is the ____. Select one: a. meter b. centimeter c. kilometer d. liter

a. meter

Which of the following statements about air distribution systems is false? Select one: a. Negative pressure in a building decreases the infiltration at windows and doors. b. It can ensure that all air entering a building can be filtered before reaching the occupied spaces. c. A dedicated air intake can be used to draw outside air into the ventilation system. d. Air that enters by infiltration is untreated and can be dirty.

a. Negative pressure in a building decreases the infiltration at windows and doors.

The one view not necessary in an orthographic projection is the ____ view. Select one: a. bottom b. side c. top d. front

a. bottom

Masonry walls are dimensioned to their ____ surfaces. Select one: a. exterior b. flat c. interior d. rough

a. exterior

Heat recovery ventilators (HRVs) ____. Select one: a. use a fan to bring in fresh air from the outside b. remove moisture from incoming air in the winter c. block all incoming air during summertime d. All of the above.

a. use a fan to bring in fresh air from the outside

A "30 scale" on a three-sided engineer's scale translates to ____. Select one: a. 30 feet wide by 30 feet long b. 30 feet are equal to 1 inch c. 30 feet maximum length d. 100 feet divided by 30

b. 30 feet are equal to 1 inch

Each centimeter is divided into ____. Select one: a. 10 km b. 10 mm c. 2 L d. 1 m

b. 10 mm

Each inch on an engineer's scale is divided into 10 increments that represent 1¢, which means 1² = 10¢. A line measured with an engineer's scale that is 3 inches plus 3 increments would be ____. Select one: a. 3¢-3² b. 33¢ c. 30¢-3² d. None of the above.

b. 33¢

The human comfort level for summer is about ____ and 50% rh. Select one: a. 55°F (13°C) db b. 75°F (24°C) db c. 85°F (29°C) db d. 93°F (34°C) db

b. 75°F (24°C) db

The legend is used to ______________. Select one: a. tell the history of the building b. explain the symbols used on the drawing c. define the terms used on the drawings d. quickly reference all of the different drawing sheets

b. explain the symbols used on the drawing

On a fractional rule, there are 16 tick marks in each ____. Select one: a. meter b. inch c. foot d. centimeter

b. inch

Straight lines that are neither horizontal nor vertical are called ____. Select one: a. declined lines b. inclined lines c. perpendicular lines d. sloped lines

b. inclined lines

A list of symbols and their corresponding meanings can be found in the ____. Select one: a. directory of shapes b. legend c. line manual d. sym-code book

b. legend

Air delivered to a room from a supply duct is called ____. Select one: a. secondary air b. primary air c. throw d. return air

b. primary air

A ____ line is an extra-heavy line that is made up of long dashes alternating with two short dashes. Select one: a. border b. property c. center d. hidden

b. property

Automatic fire dampers should be installed in all ____ ducts in commercial and industrial buildings. Select one: a. horizontal b. vertical c. supply d. return

b. vertical

If the scale of a drawing is identified as 1/8² = 1¢ and an interior wall of the drawing measures 3², then the actual length of the wall is ____. Select one: a. 3¢ b. 8¢ c. 24¢ d. None of the above.

c. 24¢

Convert 19 inches to millimeters. Select one: a. 748 mm b. 48.26 mm c. 482.6 mm d. 0.748 mm

c. 482.6 mm

Which of the following statements about air ducts is true? Select one: a. Square ducts are more efficient and reduce resistance to airflow. b. Round ducts conform better to building construction than square or rectangular ducts. c. Air ducts may be made of galvanized sheet metal. d. Air ducts must be made of materials with a great deal of pliability.

c. Air ducts may be made of galvanized sheet metal.

Which of the following statements about airflow in duct systems is false? Select one: a. The more abruptly the airflow changes direction, the more turbulent it becomes. b. Turbulence can be minimized in changes of direction by installing long-radius elbows. c. Airflow compression will be reduced through the use of additional 90° elbows. d. Built-in directional vanes can be used to minimize turbulence.

c. Airflow compression will be reduced through the use of additional 90° elbows.

Which of the following statements about damper controls is false? Select one: a. They may be powered by electric motors or pneumatics. b. Multiple dampers may be interlocked by controls to maintain correct total airflow. c. All automatic dampers open and close based on the pressure of the conditioned air. d. All of the above.

c. All automatic dampers open and close based on the pressure of the conditioned air.

Which of the following statements about duct systems is false? Select one: a. Ducts should be insulated if the duct system is installed in an unvented attic. b. In basements, ducts can be run across and just under the first floor's floor joists. c. Ducts in concrete are made by drilling airways with large drill bits and hole saws. d. Ducts may be installed in basements, crawl spaces, and concrete floors.

c. Ducts in concrete are made by drilling airways with large drill bits and hole saws.

Which of the following statements about an evaporative cooling system is false? Select one: a. It will decrease both sensible and latent heat. b. It gives a cooling effect by adding moisture into the air. c. It decreases the rh level of the air while raising its db temperature. d. All of the above.

c. It decreases the rh level of the air while raising its db temperature.

If you wanted to determine where the public utilities enter into a building which set of drawings would you reference? Select one: a. Mechanical drawings b. Architectural drawings c. Site drawings d. Electrical drawings

c. Site drawings

Which of the following statements about fire dampers is false? Select one: a. The two general types of fire dampers are static and dynamic. b. Fire dampers are designed to close automatically on detection of heat. c. Static systems require fire dampers at locations in which fan pressure will be on during a fire. d. Ducts passing through a firewall must have fire dampers.

c. Static systems require fire dampers at locations in which fan pressure will be on during a fire.

A ____ line is used to indicate the centers of objects such as columns and fixtures. Select one: a. border b. property c. center d. hidden

c. center

A marking device such as an arrow, dot, or tick mark is placed at each end of a ____. Select one: a. compass b. hidden line c. dimension line d. crosshatch

c. dimension line

The heat released when moisture condenses out of the air is ____ heat. Select one: a. liquid b. humidified c. latent d. sensible

c. latent

Horizontal lines are sketched by positioning your forearm ____ to the line being sketched. Select one: a. at a 30° angle b. parallel c. perpendicular d. at a 45° angle

c. perpendicular

Elevation drawings are _________________________________________. Select one: a. views taken from above the building b. three dimensional views of a building c. side views of a building d. the lines shown on a site plan.

c. side views of a building

The method most used to sketch an arc is the ____ method. Select one: a. inclined line b. rectangular c. triangle-square d. half-circle

c. triangle-square

Dimensions provided on elevation drawings are those related to the ____. Select one: a. x-axis b. slope intercept c. vertical plane d. horizontal plane

c. vertical plane

If ¼" = 1'.0", then 4 ¼" equals ______________ feet. Select one: a. 13 b. 5 c. 16.5 d. 17

d. 17

A reading of 5.8 meters equals ____. Select one: a. 580 mm b. 58 cm c. 5800 cm d. 5800 mm

d. 5800 mm

If the rooms in a building are tightly sealed, the ____. Select one: a. HVAC system should be designed to admit fresh air into the building b. amounts of carbon dioxide, water vapor, and various impurities will increase c. level of oxygen will decrease and eventually be exhausted d. All of the above.

d. All of the above.

Which of the following principles applies when designing a duct system for a building? Select one: a. Locate the air handler in a central location. b. Keep duct runs as short as practical. c. Install ducts off the sides of a plenum, not off the end. d. All of the above.

d. All of the above.

What types of lines are used to show footages on a floor plan? Select one: a. Match lines b. Hidden lines c. Break lines d. Dimension lines

d. Dimension lines

Which of the following statements about duct systems installed in concrete is false? Select one: a. Ducts installed in a concrete slab are usually made of metal, plastic, or ceramic. b. The ductwork can be laid out and the slab poured over it. c. The branch ducts usually connect to a perimeter duct that has diffusers installed at intervals along the floor. d. Upflow furnaces are used with this type of installation.

d. Upflow furnaces are used with this type of installation.

Fans used in air distribution systems ____. Select one: a. generate positive pressure at the air inlet b. generate negative pressure on the exhaust side of the fan c. are usually located in the outlet of the condensing unit d. are usually axial flow or radial flow

d. are usually axial flow or radial flow

Edges and surfaces that are not visible in a particular area are drawn with ____ lines. Select one: a. border b. property c. center d. hidden

d. hidden

Grid lines are used to ______________. Select one: a. indicate a cross section of a material b. indicate that an object has been broken off at that point to save space c. indicate land boundaries on a site plan d. refer to specific locations on the drawings

d. refer to specific locations on the drawings

A section cutting line marks the part of the drawing being cut to create a(n) ____. Select one: a. elevation rendering b. topographic view c. mess d. sectional view

d. sectional view