Boma HVAC Study guides, Class notes & Summaries

The 2 classification of compressors are called? Positive displacement and kinetic displacement The 3 main ways that heat transfer takes place are by _____, _____, and _____? Convection, conduction and radiation 50/50 solder is made up of equal proportions of _____. Tin and lead 50F steam heat is equal to _____. 122F. (1.08 x C + 32 = F) A 230 volt PFC compressor tries to start at 184 volts and trips on overload protection, the starting torque of the motor is _____? Decrease by lower vo...

HVAC Pretest BOMA Questions and Answers 100% Solved Two basic categories of chillers are the ___. a. Compression cycle and absorption b. purge and absorption c. absorption and lithium bromide d. purge and lithium bromide a. Compression cycle and absorption The five requirements for comfort are proper temperature, humidity, filtration, _____, and ventilation. a. circulation b. velocity c. . d. none of the above a. circulatio

Refrigeration Study Guide Questions and Answers 100% Solved Difference between a substance melting point and freezing point Adding or Subtracting latent heat 40 lbs of pressure added to liquid refrigerant would have what effect on its boiling Boil at a higher temperature Amount of heat added to 1 pound of water to raise it one degree is a BTU What causes the fastest rate of temp transfer between two objects A 75 degree differential _______ best describes sensible heat Superheat A l...

Refrigeration Study Guide 2 Questions and Answers 100% Solved ________ heat causes a change in temperature. Sensible ________ heat causes refrigerant to change state. Latent ________ is being removed when a vapor is changing into a liquid Latent heat of condensation ________ is being added when a liquid is changing into a vapor. Latent heat of vaporization The ________ increases the pressure and temperature of the refrigerant. Compressor _________ use an external drive motor. Open Co...

HVAC BOMA 501 STUDY GUIDE QUESTIONS AND ANSWERS 100% SOLVED Dual Duct System A system in which hot air and cold air are supplied by separate ducts and mixed at each controlled space to provide the desired supply air temperature. This method consumes a great deal of energy. Muiltizone 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 Load Calulations take the sensible heat and the latent heat into consider...

BOMA-HVAC TEST WITH COMPLETE SOLUTIONS The man whose work is considered the real beginning of the science of air-conditioning _____. Willis Carrier Psychrometry refers to the relationship between _____ and _____. Humidity; air The amount of moisture in the air compared to how much it can hold is _____. Relative humidity The human bodies well being depends upon the _____. Bodies metabolism The device used to determine the moisture content of air is the _____ psychrometer Of the fuels...

HVAC Electricity Questions and Answers 100% Solved how much resistance must be placed in 120V curcuit in order to limit the current to 2Amps 60 Ohms when current flows in a 2 wire circuit such as 120v, if a clamp on amp meter is clamped around both wires what measurment would you expect. 0 amps - due to cancellation of 2 fields Current flow is? The flow of electrons in the circuit. What is the symbol for impedence in an AC CIrcuit. Z Impedence is? Oppostion to Alternating current flo...

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 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 p...

HVAC TEST QUESTIONS AND ANSWERS 100% SOLVED The coolant bypass solenoid valve provides a second path for coolant to flow between the engine block and the: Thermostat housing The heater core is an air to liquid heat exchanger similar to a radiator. false the 1.6l gtdi engine uses the no-flow coolant strategy in the engine block to: Both a and b on vehicles equipped with the auto start-stop feature, such as the 2014 fusion, the cabin heater coolant pump will only operate when: engine coo...

HVAC EXAM WITH COMPLETE SOLUTIONS Heat Transfer Moves from one substance to another as well as between molecules of a substance, temperature is the driving force Temperature The level of heat or heat intensity, measured with thermometers Heat Is the motion of molecules, and travels from a warm substance to a cold substance Conduction Energy travelling from one molecule to another, involves direct contact Radiation Passes through air and heats the first solid object it comes in contact wit...