Question 1

We sense odours by?&#10;A)A measuring instrument&#10;B)Identifying smells&#10;C)Breathing onto others&#10;D)Olfactory response&#10;E)Tasting them in our mouth

Accepted Answer

We sense odours through our olfactory response, which involves the detection of chemicals in the air by specialized receptors in the nose. A measuring instrument (A) can be used to quantify the concentration of an odorant, but it cannot sense the odor itself. While identifying smells (B) is part of the process of olfactory perception, it does not accurately capture the full experience of sensing an odor. Breathing onto others (C) is not a valid method of detecting or experiencing odours. Finally, tasting odours (E) is not a reliable or safe means of sensing odours, as it can lead to ingestion of harmful substances.

Question 2

Which is correct about air humidity?&#10;A)Moisture within building air will always condense into liquid at the lowest surface temperature location&#10;B)Moisture in room air finds it own way out of the building&#10;C)Moisture gained by room air will always condense somewhere and drain away&#10;D)Natural ventilation does not remove moist air from a building&#10;E)Only mechanical exhaust systems remove moist air from a building

Accepted Answer

Moisture within building air will always condense into liquid at the lowest surface temperature location, which can lead to condensation on walls, windows, and other cold surfaces. This can cause damage to building materials and promote the growth of mold and mildew. Proper ventilation and insulation can help prevent this.

Question 3

Which is correct about ventilation?&#10;A)Exfiltration of air is a bad thing for buildings&#10;B)All air leaving a building is replaced by the same quantity of incoming air from outside&#10;C)Natural ventilation only provides for air to leave the building&#10;D)All toilet rooms must have natural ventilation openings to outside air&#10;E)All house bathrooms and toilet rooms must have openable windows to outside

Accepted Answer

This statement is correct as part of the basic principles of ventilation. The amount of air leaving a building should be replaced by the same amount of incoming air from outside to maintain proper ventilation. A is incorrect, as some amount of exfiltration may be necessary for proper ventilation. C is incorrect, as natural ventilation can also provide for incoming air. D and E are incorrect as there are other ways to provide ventilation in toilet rooms and bathrooms.

Question 4

Dry bulb air temperature is measured by?&#10;A)Thermistor&#10;B)Thermocouple&#10;C)Mercury in glass thermometer&#10;D)Black bulb thermometer&#10;E)Thermistor anemometer

Accepted Answer

Dry bulb air temperature is usually measured using a mercury in glass thermometer. This is a common and traditional method of measuring temperature in HVAC systems.

Question 5

Which is not one atmospheric pressure?&#10;A)300 inches of mercury&#10;B)1.0 bar&#10;C)14.7 pounds per square inch, psi&#10;D)1,013.25 millibars&#10;E)101325 Pa

Accepted Answer

300 inches of mercury is not a unit of atmospheric pressure, but rather a unit of measuring barometric pressure. Atmospheric pressure is typically measured in units such as bar, psi, millibars, or Pascals.

Question 6

What does Fanger's thermal equation for sedentary comfort do?&#10;A)Shows that it is impossible to satisfy everyone in the room&#10;B)Finds a balance between variables affecting comfort&#10;C)Shows that people prefer slightly cool conditions&#10;D)Shows that people prefer slightly warm conditions&#10;E)Shows when room conditions create thermal neutrality, i.e. neither too hot nor too cool

Accepted Answer

Fanger's thermal equation for sedentary comfort calculates the conditions needed to achieve thermal neutrality, where people feel neither too hot nor too cold.

Question 7

Anemometer is?&#10;A)For measuring fan vane angles&#10;B)A calibrated device to measure air speed in a room, outdoors or an air duct.&#10;C)For assessing animosity towards the room conditions&#10;D)A rotating vane with thermistor or heated wire sensor&#10;E)A mechanical chart recorder for temperature

Accepted Answer

An anemometer is a calibrated device used to measure air speed in a room, outdoors or an air duct.

Question 8

Which is the basic need of human comfort?&#10;A)Constant core body temperature&#10;B)Quiet indoor environment&#10;C)Being comfortably warm&#10;D)Avoidance of draughts&#10;E)Avoiding suffering heat stroke by use of cooling systems

Accepted Answer

The answer of Which is the basic need of human...

Question 9

Which is correct about heat transfer? A)Only steam boilers evaporate water B)Still water surfaces do not evaporate C)Water must be heated to at least 60^oC to cause evaporation D)Evaporation heat transfer is proportional to the partial pressure of the surrounding air E)Vaporise and evaporate have different meanings

Accepted Answer

Evaporation heat transfer is proportional to the partial pressure of the surrounding air. This is known as Dalton's law of partial pressures. The other statements are incorrect - steam boilers are not the only things that evaporate water, still water surfaces do evaporate, water can evaporate at temperatures below 60°C, and vaporize and evaporate have similar meanings.

Question 10

Which is the appropriate moving air speed for comfort criteria? A)20^oC d.b. air should be moving at around 0.1 m/s at neck level B)30^oC d.b. air can be moving at 1.25 m/s at head level for sedentary workers. C)Should be above 2.0 m/s to create stimulating environment D)Almost stagnant air around sedentary workers is preferable to avoid hot or cold draughts E)Constant air velocity, temperature and direction is preferred so it is predictable for sedentary workers

Accepted Answer

Air moving at around 0.1 m/s at neck level is considered comfortable for sedentary workers, as it is gentle enough to not cause discomfort yet provides some air movement for freshness.

Deck 3: Built Environment