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HVAC Yr 2 Exam 1. According to the National Electrical Code, UF cable is permitted to be used in which of the following locations?: in wet, dry or underground locations NEC Article 340.10 & 340.12 2. The rating of a disconnect switch on fixed HVAC equipme

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HVAC Yr 2 Exam 1. According to the National Electrical Code, UF cable is permitted to be used in which of the following locations?: in wet, dry or underground locations NEC Article 340.10 & 340.12 2. The rating of a disconnect switch on fixed HVAC equipment must be at least _________ percent of the nameplate rated-load current or branch circuit selection current — whichever is greater.: 115

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Final Exam 1 1. Cooling: What type of application is a close-on-rise thermostat usually used for? 2. A systems switch and a fan: What two manual switches are found on most low voltage thermostats? 3. The operating mode: Off, cooling, heating. The fan swit

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Final Exam 1 1. Cooling: What type of application is a close-on-rise thermostat usually used for? 2. A systems switch and a fan: What two manual switches are found on most low voltage thermostats? 3. The operating mode: Off, cooling, heating. The fan switch for on or auto.: - What systems functions does a low voltage thermostat normally control? 4. Before replacing the part: When should you approach the customer about the potential cost of a required part? 5. Is never a good idea: Explai...

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HVAC-R Final Exam 1. volt amps: Transformers are normally rated in? 2. true: An insulated jumper may be used to temporarily jump a component in an electrical circuit(true or false)? 3. divided by 10: When using a 10 wrap multiplier the reading on the mete

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HVAC-R Final Exam 1. volt amps: Transformers are normally rated in? 2. true: An insulated jumper may be used to temporarily jump a component in an electrical circuit(true or false)? 3. divided by 10: When using a 10 wrap multiplier the reading on the meter must be? 4. ladder diagram: An electrical line wiring diagram is often called?

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Chapter 12 - Refrigeration Principles 1. Refrigeration: is the process of moving heat from an area where it is undesirable to an area where the heat is not objectionable 2. Refrigeration System: is a closed system that controls the pressure and temperatur

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Chapter 12 - Refrigeration Principles 1. Refrigeration: is the process of moving heat from an area where it is undesirable to an area where the heat is not objectionable 2. Refrigeration System: is a closed system that controls the pressure and temperature of a refrigerant to regulate the absorption and rejection of heat by the refrigerant. 3. Mechani

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HVAC Exam 1 1. Matter exists in what three forms?: solid, liquid, gas 2. What is temperature measured by? Quantity or intensity: Intensity 3. Define British thermal unit (Btu): Measure of heat energy - amount of energy needed to raise 1 lb of water 1 degr

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HVAC Exam 1 1. Matter exists in what three forms?: solid, liquid, gas 2. What is temperature measured by? Quantity or intensity: Intensity 3. Define British thermal unit (Btu): Measure of heat energy - amount of energy needed to raise 1 lb of water 1 degree F 4. How much heat is required to raise the temp of 100 lb or water from 70F to 120F: Q=1000lb*(1btu / change of temp) so 1000*(1/ 50) = 50,000

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HVAC Certification Practice Tests 1. Propane and Butane are _______ than air:: Heavier 2. What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A: 6 ohms 3. Temperature at which oil starts to p

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HVAC Certification Practice Tests 1. Propane and Butane are _______ than air:: Heavier 2. What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A: 6 ohms 3. Temperature at which oil starts to produce a waxy substance that may interfere with the refrigeration system: Floc poin

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HVAC CONTRACTOR EXAM 1. An instrument that measures potential differences between 2 points in an electrical circuit is called? A. potentiometer B. thermistor C. ohmeter D. voltmeter: voltmeter 2. This device uses a thermal sensing bulb at the outlet of th

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HVAC CONTRACTOR EXAM 1. An instrument that measures potential differences between 2 points in an electrical circuit is called? A. potentiometer B. thermistor C. ohmeter D. voltmeter: voltmeter 2. This device uses a thermal sensing bulb at the outlet of the evaporator to sense temperature and control superheat

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HVAC-E Quiz 1. An overcharge of refrigerant will cause: Increased head pressure 2. High pressure gauge reads 146 psig and the liquid line temperature at the condensing unit is 95°F. What is the operating systems sub-cooling?: 35°F subcooling 3. A partiall

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HVAC-E Quiz 1. An overcharge of refrigerant will cause: Increased head pressure 2. High pressure gauge reads 146 psig and the liquid line temperature at the condensing unit is 95°F. What is the operating systems sub-cooling?: 35°F subcooling 3. A partially clogged capillary tube can cause.: A starved evaporator 4. An increase in head pressure causes __________ refrigerant to flow through

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HVAC EXAM 3 1. What is the purpose of an expansion tank? Remove air from the water Filter the water Allow for the introduction of make-up water Provide high and low limits on pressure Allow the water to cool: Provide high and low limits on pressure

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HVAC EXAM 3 1. What is the purpose of an expansion tank? Remove air from the water Filter the water Allow for the introduction of make-up water Provide high and low limits on pressure Allow the water to cool: Provide high and low limits on pressure

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HVAC EXAM 2 1. Which of the following is used to determin the size of a room: Window frames 2. To find volume of a cylinder it is necessary to: Find the volume of the circle forming base 3. for which of the folling is area used: surfaces 4. In order to de

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HVAC EXAM 2 1. Which of the following is used to determin the size of a room: Window frames 2. To find volume of a cylinder it is necessary to: Find the volume of the circle forming base 3. for which of the folling is area used: surfaces 4. In order to determine hear flow one must know the amount of time and: BTU 5. Units that connot be measured in base units and require more than one measurement are called: Derived units

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