BOMA-HVAC EXAM QUESTIONS AND
ANSWERS 100% SOLVED
In an A/C system where air comes from both a hot duct and a cold duct that is supplied from a
mixing terminal is called A dual duct system
An A/C system in which the zone control is obtained by mixing hot and cold air at the unit in
response ...
BOMA -HVAC EXAM QUESTIONS AN D ANSWERS 100% SOLVED In an A/C system where air comes from both a hot duct and a cold duct that is supplied from a mixing terminal is called A dual duct system An A/C system in which the zone control is obtained by mixing hot and cold air at the unit in response to a room thermostat is called a Multizone system Heating and cooling load calculations take the _______________ into consideration. Sensible heat and latent heat Which of the following does not provide sensible heat gain? Heat from cooking or hot baths. (latent heat has to do with moisture) Which of the following is the way that solar radiation disperses in a building? Transmitted directly to the interior of the building, absorbs by glass, reflected into the building Outside air may get into the air conditioning spaces by Infiltration through the walls, infiltration through the swinging of doors, air induced by replaced exhaust. In commercial buildings heat generated by lights does not seriously affect the control of the heating system. False The humans body's feeling of well being depends upon the body's metabolism Which of the following natural laws has the greatest bearing on science of air conditioning? Boyles Law, Charles Law, Daltons Law Why is a pitch pocket commonly used? to protect the piping and seal the roof from refrigeration lines passing through it Which of the following is an evaporative type condensers and what governs its cooling? A cooling tower governed by wet bulb temperature On an evaporative condenser what is the purpose of the eliminator? to separate the moisture carry over The _________ of a substance is the amount of heat necessary to raise the temperature of one pound of substance, one degree F. Specific heat _______________ is the amount of heat necessary to change a liquid to vapor with no change in temperature. Latent heat The difference between a pump, a fan and a compressor is Pumps pump liquid, fans and compressors pump air. Which of the following checks should be made of a blower -drive? Check the blower belts for cracks and wear, check the motor bearings for wear, check the blower bearings for wear. Which of the following is a good rule to follow when check air filters? Air filters should be of the size and type recommended by the equipment manufacture. When one of the three phases of a motor fail, how will a motor react? A winding will run hotter, the motor will generally not start, the two phases will draw 1 1/2 times more current. When megohming a motor winding, what is the rule of thumb to find an acceptable range of resistance to ground? 1000 ohms/volt Which of the following may be the cause of improper air distribution? High pressure drop thru ducts and fittings, dirty filters, incorrect fan speed. Friction losses of pressure in ducted systems occurs In elbows, along duct walls, with increase in air speed. Which of the following may cause faulty fan operation? Loose belt drive, restricted air intake, improper fan bearing lubrication What is the first step taken in all troubleshooting procedures? Analyses the complaint If the complaint is "too little heat" and the burner is short -cycling, the most likely cause is the Thermostat is out of adjustment Excessive combustion noise is most likely caused by Improper burner adjustment When a complaint is "too much heat" and the burner is running continuously, the most likely cause is Faulty wiring In a case of a failure of a burner to start, the most likely cause is a Blown fuse What is the most probable cause of a burner to start? Power failure When the complaint is "too much heat" and the heat element operates continuously, the most likely cause is Faulty control wiring If the complaint is "too much heat" and the electrical wiring is short cycling the most likely cause is Thermostat heat anticipator set too low In case of an electrical heating system not starting, the most likely cause is A blown fuse A psychrometric chart is a graphic repress Stilton of Thermodynamics properties Heat flows in one direction, usually from A position of higher temperature to a position of lower temperature The three main ways heat transfers takes place is Convection, conduction, radiation Which of the following material is the best conductor of heat? Metal Hest will continue to flow between two bodies until they have become the same Temperature Enthalpy refers to Heat content of a refrigerant (both latent and sensible) Psychrometric is the science of dealing with the relationship between humidity and the atmosphere Which of the following is not one of the four environmental qualities provided by complete air conditioning systems? Electrostaic suppression Translated into degrees Fahrenheit, which is the value of absolute zero? Minus 460 degree F. When water vapor is considered in a relationship of air, which of the following statements is most nearly correct? Mixing air on a mechanical basis causes a humid condition
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