BOMI: Air Handling, Water Treatment & Plumbing Systems Exam Questions With Verified Answers

BOMI: Air Handling, Water Treatment & Plumbing Systems Exam Questions With Verified Answers BOMI - answerAir Handling, Water Treatment & Plumbing System Chapter 1 - answerHuman Comfort Review Quiz 1 - answer 1 - The rate of exchange of fresh air for returned air in an air conditioning-system is based on the period of time covered and the number of building: - answerOccupants 2 - All of the 3 following are methods of heat - answerRadiation Convection Conduction NOT Reduction 3 - Which heat load source is most likely to affect all zones of a building? - answerLighting equipment 4 - To compensate for heat gain from office equipment in modern office building, air- conditioning systems have been designed to offset how many watts per square foot? - answer1 to 3 Watts per square foot. 5 - The leftover heat in a building from the day before is the: - answerPull-down load 6 - What exists when the temperature and relative humidity of a person's environment permit the person to lose metabolic heat at the same rate he or she produces it? - answerThermal comfort 7 - Why is it most important to air-condition with sedentary people? - answerThey think about their comfort more 8 - How is sensible heat measured? - answerDry-bulb thermometer 9 - What type of heat is released or used during a change of state between solid, liquid, and gas? - answerLatent heat 10 - Which of the following affects the amount of water vapor the atmosphere can hold? - answerAir temperature 11 - Which of the following is true about mechanical refrigeration cycle air flows? - answerAir flows from higher pressure to lower pressure 12 - Boyle's law states: - answerAs Pressure goes up, volume goes down. 13 - Maintaining temperature and ___Blank___ have a direct impact on maintaining human comfort. - answerHumidity 14 - How does introducing air-conditioned and filtered air at a positive pressure into a building help building comfort? - answerIt causes the outward escape of air, limiting infiltration. Chapter 1 Key Concept - answer 1 - What is the relationship between thermal comfort and metabolic heat? - answerThermal comfort exists when the temperature and relative humidity of a persons environment permit the person to lose, without conscious effort, metabolic heat at the same rate he or she produces it. 2 - What occupant activity level is chosen when engineers design an air-conditioning system? - answeraverage and peak activity levels 3 - What is the rate of exchange of fresh air for return air based on in an air-conditioning system? - answerThe rate of exchange of fresh air for returned air is based on the quantity of fresh air required for each building occupant over the course of time. 4- Define heat - answerHeat is a form of energy which cannot be destroyed only transformed or moved. Heat is added to conditioned air in the winter and removed in the summer. No shit. 5 - What happens to the rate of heat transfer if the difference in temperature increases? - answerthe rate of heat transfer Increases if the difference in temperature increases 6 - What are three methods in which heat is transferred? - answerConvection Conduction Radiation 7 - Define conduction - answerThe direct transfer of heat from one body to another. Define connvection - answerThe transfer of heat using a substance Define radiation - answerHeat that an object throws off to its surroundings. 8 - Define sensible heat - answerA measure of the internal heat of a substance. No change in state or physical property. 9 - Define latent heat - answerThe energy that is used or released during the change in state. 10 - Define relative humidity - answerThe amount of water vapor held in the air 11 - Does moist air have more or less density than dry air? - answerMoist air has less mass than dry air and is less dense than dry air. 12 - What is the atmospheric pressure of air at sea level? - answer14.7 psi 13 - Explain Charles' law: - answerCharles law explains why gases expand when heated and contract when cooled. 14 - Explain Boyle's law - answerBoyle's law states that a constant temperature, as the volume increases, the pressure decreases. 15 - How does the human body regulate temperature? - answerSweating when overheating too cool down. 16 - What system produces the most heat in a building? - answerZoning HVAC system? Maybe look into this one. 17 - What are the four main categories of internal heat loads? - answerPeople Heat Load Lighting Heat Load Equipment Heat Load System Heat Load 18 - How have office building HVAC systems been designed to compensate for heat gain from office equipment? - answerAir conditioning systems have been designed to offset one to three watts per square foot. 19 - What is pull-down load? - answerHeat left over from the day before must be removed the following morning when the air conditioning system is restarted. 20 - How can the problem of air and water vapor infiltration into a building be solved? - answerTo reduce infiltration problems, ventilation air should be introduced through the air conditioning system in constant quantities to maintain a slight positive pressure within the building. The pressure cases an outward escape of air through cracks, windows, and doors, limiting infiltration. Chapter 2 - answerAir Properties and Heat Doctor Review Quiz 2 - answer 1 - Absolute pressure is equal to standard sea-level plus: - answerGauge pressure 2 - It is unusual for an air-conditioning system to exceed how many p.s.i.g or p.s.i.a? - answer0.5 psig 3 - The pressure of the air being pushed against the inside walls of a closed duct by a fan is called: - answerStatic pressure 4 - The pressure that is created when air moved is called: - answerVelocity pressure 5 - Velocity pressure is found by subtracting: - answerStatic pressure from total pressure 6 - A pressure drop is the difference in air pressure between where air enters a device and: - answerWhere the air leaves the device 7 - When designing a duct system, it is important to remember that directional changes increase friction and __Blank__ efficiency. - answerReduce 8 - The higher the airflow velocity in a duct work system is, the more __Blank__ will be generated, and the power efficiency will increase. - answerNoise 9 - Which material used to construct duct work is prohibited from use in hospitals and kitchens by many local codes, and has been declared a possible carcinogenic to humans by the World health Organization? - answerFibrous glass wool 10 - A draft exists when room air movement aka velocity is at or above how many fpm? - answer50 fpm 11 - Airflow in a duct system is regulated by air volume control devices called: - answerDampers 12 - A silencer is a specially designed duct component that reduces noise made in the duct by: - answerChanging airflow characteristics 13 - Which type of building is the perimeter loop system ideal for? - answerSingle-story buildings with concrete slab floors. 14 - All of the following factors that influence the amount of ventilating air required: - answerThe number of people occupying the space