Arch-333 Test #1

Humans are sensitive to what range of air temperature? 8 to 10 degrees F 7 to 8 degrees F 4 to 6 degrees F 2 to 3 degrees F

2 to 3 degrees F

A building is said to be suffering from Sick Building Syndrome (SBS) when what percentage of the occupants complain of a general array of symptoms that abate after leaving the building? 5% 15% 10% 20%

20%

so it is advised to keep the air velocities between _________ feet per minute at the person to try to minimize these issues.

20-50

Static electricity starts to manifest itself at what percent of Relative Humidity? 30% 25% 20% 15%

25%

n the construction industry, a 1% decrease in direct cost translates into what increase in new profit? 1% 9% 29% 19%

29%

Designers often design to what range of Relative Humidity for occupied spaces? 20 to 40% RH 30 to 60% RH 2 to 3 % RH 40 to 50% RH

30 to 60% RH

Dust mites die below ___% RH

40%

In proper applications energy savings can range from __________ percent depending on climate and control strategy. 50 to 75 5 to 25 5 to 75 25 to 75

5 to 25

Dust mite (insect) populations decrease below ______% RH

50%

Which ASHRAE standard applies to Human Comfort? 62.1 55 100 90.1

55

Legionella, the biggest problem in the built environment, is dormant below __ºF and begins to die off at __ºF

68ºF, 122ºF

What percentage of the occupied building must be satisfied with the conditioned space in order to comply with the appropriate ASHRAE standard? -100% -90% -70% -80%

80%

Temperature Zones

A space or group of spaces within a building with heating and/or cooling requirements sufficiently similar that comfort conditions can be maintained by a single controlling device [i.e. a thermostat]

Moving air through an Air Handling Unit (AHU) is an example of which of the following systems? Hybrid Active Mixed Passive

Active

Which of the following items is considered a personal parameter with respect to thermal comfort? Dry bulb temperature Humidity Air movement Activity level

Activity level

Legionella is which of the following? Bacteria Fungi Virus Mold

Bacteria

Which of the following is a common surrogate gas used in Demand Controlled Ventilation (DCV)?2 CO CO2 O3 NH4

CO2

Personal Parameters

Clothing (clo) Metabolism (met) Age Size

If the Contract Documents are silent on unforeseen conditions, the risk falls on... Owner Operating Engineer Consulting Architect / Engineer Contractor

Contractor

DOAS stands for ... Dedicated Outside Air Systems Demand On Air Systems Dehumidification Over Air Systems Delivered Outside Air Systems

Dedicated Outside Air Systems

Which of the following is the most important determinate of comfort? Activity level Air movement Humidity Correct Answer Dry bulb temperature

Dry bulb temperature

Ventilation systems that increase the air flow across the human body produce cooling by which of the following processes? Radiation Diffusion Evaporation Conduction

Evaporation

Sick Building Syndrome

Exists when a significant percentage (e.g., more than 20%) of the occupants complain during a two week period of a set of symptoms, including headaches, fatigue, nausea, eye irritation, and throat irritation, that are alleviated by leaving the building, and are not known to be caused by specific contaminants

A single DOAS unit might be used to deliver ventilation air only to one conditioning unit. True False

False

Bacteria can be killed with either heat or cold. True False

False

Dilution removes contaminants from the occupied space. True False

False

In a human being, the metabolic rate or level (Met) is always negative. True False

False

Mold is a type of virus. True False

False

Mold requires a critical mass be attained before it can grow a colony. True False

False

The single largest expense experienced by most of our clients is energy costs. True False

False

Ventilation is not intended to be a part of the building pressurization process. True False

False

Asbestos that is disturbed into a respirable particle is referred to by what name? Allergenic HEPA Friable Respirable gas

Friable

Shutting off the Outside Air (OA) in a dilution system is likely to produce which of the following outcomes? Higher productivity Higher energy costs Higher absenteeism Higher comfort satisfaction

Higher absenteeism

Which of the following is a common disadvantage of using dilution as an IAQ strategy? Higher energy costs High installation costs Precludes the use of filters Requires a separate AHU

Higher energy costs

A system that uses a combination of ceiling fans and operable windows would be referred to as what kind of ventilation system? Variable Active Hybrid Passive

Hybrid

Uncontrolled air entering the building through cracks and other openings is referred to by what name? Exfiltration Infiltration Outdoor Air Ventilation

Infiltration

Sitting next to a cold window on a winter's day is likely to chill the occupant due to which of the following phenomena? Mean Radiant Temperature Wet bulb temperature Dry bulb temperature Effective temperature

Mean Radiant Temperature

The air "seen" by the Air Handling Unit (AHU) in a dilution-ventilation scheme is called by what name? Mixed Air (MA) Return Air (RA) Supply Air (SA) Relief Air (ReA)

Mixed Air (MA)

Which one of the following could be a potential hazard you need to look for during a site visit? -Mold -Light -Air -Moisture

Mold

Which of the following is an organic material that is commonly used in construction? Steel studs Brick Glass Paper-backed drywall

Paper-backed drywall

The condition where an air-conditioning unit runs a very short period of time before reaching the thermostat setting, thus allowing Relative Humidity to rise, is called by what name? Staging Short cycling Temperature mixing Dumping

Short cycling

Which of the following is likely to be the most effective and least costly IAQ strategy? Dilution Filtration Contaminant capture Source elimination

Source elimination

The ASHRAE Standard that applies to ventilation is which of the following? Standard 55 Standard 62.1 Standard 90.1 Standard 100

Standard 62.1

Which of the following is not affected by the indoor environment? Employee turnover Temperment Productivity Absenteeism

Temperment

Comfort

The condition of mind that expresses satisfaction with the thermal environment. A building is considered comfortable when 80% or more of the occupants will find the environment thermally acceptable

A 'chimney effect' is also referred to as the 'stack effect'. True False

True

Absolute Humidity refers to the mass of water vapor in the air. True False

True

Capture velocity increases by the square of the distance from the contaminant source. True False

True

Dilution is a common IAQ strategy and is often used in conjunction with another IAQ strategy. True False

True

If using a Dedicated Outside Air System (DOAS) an economizer is no longer needed at the Air Handling Unit (AHU)? True False

True

Some molds produce a respirable spore that is pathogenic. True False

True

The Outdoor Air (OA) intake is generally up higher off the ground. True False

True

The following are components of Good Documentation Practices: 1. Written in Ink 2. Dated Accurately 3. List of Attendees 4. Signed by Author True or False

True

The stack effect causes tall buildings to draw cold air low into the building during winter and warm air into the building during summer. True False

True

The widespread use of air-conditioning has led to architecture with lower ceilings and large, deep floor plates, and non-operable windows. True False

True

When the same percentage of outside air is supplied to each space, the amount of outside air depends on the load in the space, rather than occupancy levels. True False

True

Below are all common arguments against operable windows, except for the argument that operable windows ... interfere with building temperature controls. work against the control of buidling airflow and pressure relationships. connect the user with the outdoors when this is a desired feature. allow dust and allergens unfiltered into occupied space.

connect the user with the outdoors when this is a desired feature.

Conditions Needed for Mold Growth

•One viable spore •An acceptable temperature range •A usable, organic food source •Adequate moisture •Might be in the food source

IAQ Strategies

•Source Elimination •Capture •Filtration •Dilution •UV/Chemical