air conditioning certification exam (exam code a-02) EXAM BUNDLE (COMPLETE PACKAGE DEAL)QUESTIONS AND ANSWERS 100% CORRECT

Who Must Be Certified? Any person that services Motor Vehicle Air Conditioning (MVAC) must be certified. Servicing of motor vehicle air conditioning includes repairs, leak testing, and "topping off" of air conditioning systems low on refrigerant, as well as any Who Must Be Certified? Any person th...

after a vacuum pump has been used, a continuous pressure rise in the system most likely indicates? - ANSWERexistence of a leak after a vacuum has been pulled to 500 microns, a pressure rise in a system, followed by a leveling-off at 1500 microns, most likely indicates? - ANSWERpresence of moistur...

R-22 - ANSWERWhich refrigerant can be used for leak detection as a trace gas and pressurized with nitrogen Type 2 certs applies to - ANSWERHigh and very high pressure refrigerants R-134a - ANSWERWhich refrigerant is a drop in replacement for R-12 False - ANSWERIf nitrogen is not available f...

What is the purpose of the EPA type II certification? - ANSWERTechnicians maintaining, servicing, repairing or disposing of medium, high, and very high-pressure appliances must be certified as a type II technician. Air-conditioning appliances used to supply cooling in order to control heat and or...

Azeotrope - ANSWERa blend of 2 or more components whose equilibrium vapor phase and liquid phase compositions are the same given pressure. Halocarbon - ANSWERa holgenated hydrocarbon containing one or more of the 3 halogens: fluorine, chlorine, and bromine. CFCs consist of __, __, and __. - AN...

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 - ANSWERa. Compression cycle and absorption The five requirements for comfort are proper temperature, humidity, filtration, ...

One watt (1 W) of electrical energy is equivalent to ________ Btu's of heat energy. - ANSWER3.413 Btus Latent heat is also know as. A. Heat quantity B. Heat Intensity C. Hidden Heat D. Specific Heat - ANSWERC. Hidden Heat What is superheat? A. A vapor with a temperature above its satur...

Azeotrope - ANSWERa blend of 2 or more components whose equilibrium vapor phase and liquid phase compositions are the same given pressure. Halocarbon - ANSWERa holgenated hydrocarbon containing one or more of the 3 halogens: fluorine, chlorine, and bromine. CFCs consist of __, __, and __. - AN...

Which of the following statements is true? - ANSWERWhen liquid boils, heat is absorbed. Which of the following best describes the principle of latent heat of vaporization? - ANSWERThe heat energy required to change a liquid to a vapor without raising its temperature. Which of the following ter...

How much heat is required to melt a 10 pound block of ice that is sitting at 32 degrees F into warm water given that the heating temperature is at 80 degrees F? - ANSWER1,920 Btu/h In many condensing unit applications, it is necessary to heat the compressor to evaporate liquid refrigerant trapped...

How much heat is required to melt a 10 pound block of ice that is sitting at 32 degrees F into warm water given that the heating temperature is at 80 degrees F? -ANSWER 1,920 Btu/h In many condensing unit applications, it is necessary to heat the compressor to evaporate liquid refrigerant trapped...

Which Refrigerants contain the most chlorine? - ANSWERCFC's As of what date did it become unlawful to intentionally release Class 1 and Class 2 refrigerants to the atmosphere? - ANSWERJuly 1, 1992 Which Refrigerants have the lowest zone depletion potential? - ANSWERHFC's The molecule foun...

1. Technician A says that evacuating an A/C system will remove air and moisture from the system. Technician B says that evacuating an A/C system will remove dirt particles from the system. Who is right? A. Technician A only B. Technician B only C. Both Tech A and B D. Neither Tech A or B - ANSWER1. ...

Heat which causes a change in temperature of a substance is called; - ANSWERsensible heat. Heat which causes a change in state of a material without a change in temperature is called; - ANSWERlatent heat. Heat which is added to a vapor after the change of state occurs is called; - ANSWERsuperh...

The U.S. Department of Energy also says that a home's heating and cooling costs can be reduced by as much as 30% by - ANSWER(d) using proper insulation and air-sealing techniques. Screening (visual inspections), diagnostic testing, and numerical analysis are three broad categories of: - ANSWER(A...

10 -ANSWER 5lb of water heated to raise the temperature 2*F requires how many BTU's? can be measured by a thermometer -ANSWER Sensible heat is heat that __________. after all of a solid changes to a liquid -ANSWER Super heat can be gained _______. subcooled -ANSWER When the temperature of ...

November 14, 1994 - ANSWERAll persons who maintain, service or dispose appliances with refrigerant need a section 608 license as of Type 1 - ANSWERPerson who maintain, service or repair small appliances must be certified as what type November 14, 1994 - ANSWERAll persons who maintain, service ...

R-134a vapor enters the condenser at 124 psig. 100F. It leaves as a liquid from the condenser sub-cooled 20F. and the pressure will be approximately - 124 psi A scroll compressor moves refrigerant by means of - involute spirals A TXV sensing bulb that is loose from the suction line will cause ...

Two technicians are discussing AC service. Technician A says each person who performs repairs for consideration involving A/C refrigerant must be trained and certified. Technician B says each piece of equipment that is used to service motor vehicle air conditioners must be approved and certified? Wh...

Who Must Be Certified? Any person that services Motor Vehicle Air Conditioning (MVAC) must be certified. Servicing of motor vehicle air conditioning includes repairs, leak testing, and "topping off" of air conditioning systems low on refrigerant, as well as any other repair to the vehicle that req...

A technician who is servicing a residential split system providing comfort air conditioning would expect to find _____ refrigerant. - ANSWERR-22 When under a deep vacuum, a hermetically sealed refrigeration compressor's _____. - ANSWERmotor windings could be damaged if energized After install...

after a vacuum pump has been used, a continuous pressure rise in the system most likely indicates? - ANSWERexistence of a leak after a vacuum has been pulled to 500 microns, a pressure rise in a system, followed by a leveling-off at 1500 microns, most likely indicates? - ANSWERpresence of moistur...

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 - ANSWERa. Compression cycle and absorption The five requirements for comfort are proper temperature, humidity, filtration, ...

R-22 - ANSWERWhich refrigerant can be used for leak detection as a trace gas and pressurized with nitrogen Type 2 certs applies to - ANSWERHigh and very high pressure refrigerants R-134a - ANSWERWhich refrigerant is a drop in replacement for R-12 False - ANSWERIf nitrogen is not available f...

What is the purpose of the EPA type II certification? - ANSWERTechnicians maintaining, servicing, repairing or disposing of medium, high, and very high-pressure appliances must be certified as a type II technician. Air-conditioning appliances used to supply cooling in order to control heat and or...

Azeotrope - ANSWERa blend of 2 or more components whose equilibrium vapor phase and liquid phase compositions are the same given pressure. Halocarbon - ANSWERa holgenated hydrocarbon containing one or more of the 3 halogens: fluorine, chlorine, and bromine. CFCs consist of __, __, and __. - AN...

rooftop single-zone - ANSWERa typical _____ unit consists of a supply fan, one or more stages of cooling, one or more stages of heating, controls, ductwork, and power connections 1 - ANSWERa rooftop VAV unit uses static pressure sensor to control the discharge air pressure at ___" WC in the duct...

Which of the following statements is true? - ANSWERWhen liquid boils, heat is absorbed. Which of the following best describes the principle of latent heat of vaporization? - ANSWERThe heat energy required to change a liquid to a vapor without raising its temperature. Which of the following ter...

Which unit contains a desiccant to remove moisture from the system? -ANSWER Receiver dryer and Accumulator In a piston type compressor, the pistons are driven by what? -ANSWER Swash plate, Crankshaft or Wobble plate (All of the Above) The basic design of compressors include what? -ANSWER Pisto...

November 14, 1994 - ANSWERAll persons who maintain, service or dispose appliances with refrigerant need a section 608 license as of Type 1 - ANSWERPerson who maintain, service or repair small appliances must be certified as what type Metering device - ANSWERCauses a reduction in pressure, and ...

Before charging a new system with refrigerant, what should be done? - ANSWERPressurize with nitrogen (classified as an inert gas) and leak Which refrigerant can be used for leak detection as a trace gas and pressurized with nitrogen? - ANSWERR-22 What tools can you use to find general area of...

R-134a vapor enters the condenser at 124 psig. 100F. It leaves as a liquid from the condenser sub-cooled 20F. and the pressure will be approximately - ANSWER124 psi A scroll compressor moves refrigerant by means of - ANSWERinvolute spirals A TXV sensing bulb that is loose from the suction line...

After a system has been opened and the compressor changed you should - ANSWERreplace the line drier, leak check, evacuate and recharge When testing an air cooled condenser, the SAT of the condenser should be - ANSWER30F higher than the entering air Solid contaminants such as sludge and carbon ...

After a system has been opened and the compressor changed you should - ANSWERreplace the line drier, leak check, evacuate and recharge When testing an air cooled condenser, the SAT of the condenser should be - ANSWER30F higher than the entering air Solid contaminants such as sludge and carbon ...

Air Conditioning - ANSWERA system or process for sinultaneously controlling temperature, humidity, purity, distribution and motion of air in an interior space. Air Conditioner - ANSWERAny device or apparatus for controlling, especially lowering, the temperature and humidity of a space Packaged...

Air-conditioner compressors should not be operated below ___ - ANSWER60 degrees F The compressor pumps refrigerant only in the ___ state. - ANSWERVapor The condenser coil fins on air conditioners provide for heat transfer from high temperatures to low temperatures. - ANSWERTrue While conden...

Technician A says that heat is measured in degrees. Technician B says that temperature is measured in degrees. Which technician is correct? - ANSWERTechnician B The heater uses ________ to heat the air inside the vehicle on most vehicles. - ANSWERHot coolant from the engine run through a heater c...

How much heat is required to melt a 10 pound block of ice that is sitting at 32 degrees F into warm water given that the heating temperature is at 80 degrees F? - ANSWER1,920 Btu/h In many condensing unit applications, it is necessary to heat the compressor to evaporate liquid refrigerant trapped...

IFor mechanical draft system, exit terminal located adjacent to public walkways shall be no less than ____________ feet above finish ground level. - ANSWER7 A 2000 sq. ft. "Type II" dry-cleaning systems shall be provided with an exhaust no less than __________ CFM's. - ANSWER2000 A bathroom...

What is the significance of the Montreal Protocol? - ANSWERThe Montreal Protocol IS AN International agreement that established target dates for the phase out of ozone depleting substances. What is the possible fine for violating the Clean Air Act? - ANSWER$97,229 per incident per day List the...

What is the significance of the Montreal Protocol? - ANSWERThe Montreal Protocol IS AN International agreement that established target dates for the phase out of ozone depleting substances. What is the possible fine for violating the Clean Air Act? - ANSWER$97,229 per incident per day List the...

What is the first step in starting an air conditioning system? - ANSWERSet the thermostat to cool and lower the temperature. What are the thermostat connections for the cooling operation? - ANSWERR-G and R-Y What is a good way to trace a diagram without defacing or permanently marking the diag...

Which of the following refers to the amount of refrigerant in the system compared to how much should be in the system? Undercharged State of charge Overcharged Charge - ANSWERState of charge In an orifice tube system, an undercharge of refrigerant will cause _________ of the air-condition...

Which of the following statements is true? A. Heat travels from a cooler area to a warmer area B. When liquids evaporate, heat is released C. When a gas condenses to a liquid, heat is absorbed D. When a liquid boils, heat is absorbed - ANSWERD. When a liquid boils, heat is absorbed Which of ...

What date was the sale of CFC's & HCFC's restricted to technicians certified in refrigerant recovery? - ANSWERNovember 14, 1994 Section 608 of the Federal Clean Air Act requires technicians to what? - ANSWERRecover all refrigerants. The objective of the Clean Air Act is to protect what? - AN...

Split ac system is considered split - ANSWERBecause it splits its system components into seperaye locations Compressor found in - ANSWERCondensing unit Evaporator found in - ANSWERCentral air handler central air conditioning system - ANSWERA centrally locates system that is capable of provi...

Water cooling evaporator constructions include - ANSWERTube in tube, Shell and coil, and Shell and tube Select the temperature scales that can be used to work gas law problems. - ANSWERKelvin and Rankine A heat process that causes a substance to change state is called - ANSWERlatent heat HV...

sensible heat - ANSWERHeat that causes change in temperature of a substance latent heat - ANSWERHeat that is added with out a rise in temperature super heat - ANSWERHeat added to refrigerant in vapor state after evaporation process is involute spirals - ANSWERScroll compressor moves refrige...

As the pressure of a cylinder containing liquid refrigerant increases, the saturation temperature - ANSWER What is a "ton" of refrigerant - ANSWER12,000 BTU's per hour The purpose of a P/T (Pressure/Temperature) Chart is to - ANSWERdetermine saturated temperature at given pressure A stan...

The insulating value of clothing is measured in clo units, which is equivalent to: - ANSWERa typical American man's business suit in 1941 As air temperatures approach those of our own body, the following mechanism for heat flow becomes essential: - ANSWERevaporation List the three categories ...

10 - ANSWER5lb of water heated to raise the temperature 2*F requires how many BTU's? can be measured by a thermometer - ANSWERSensible heat is heat that __________. after all of a solid changes to a liquid - ANSWERSuper heat can be gained _______. subcooled - ANSWERWhen the temperature of ...

Heat flow, Heat absorption, Pressure and Boiling Points - ANSWEROn which of the following laws of nature is the air-conditioning system based? D. None of these answers are correct - ANSWERWhich of the following statements is not correct? A. Refrigerant leaves the compressor as a high-pressure, h...

bioenergetics - ANSWERThe flow of energy in a biological system; the conversion of macronutrients into biologically usable forms of energy. What are the 5 points of body contact? - ANSWER1. Head in neutral position on bench or back pad 2. Shoulders and upper back set evenly on bench or back pad ...

If 30 oz. of refrigerant are to be added to a refrigeration system and the supply cylinder weighs 26 lb. 4 oz. before any is added, what will the supply cylinder weigh after the system has been charged? - ANSWER24 lb. 6 oz. Fractionation occurs when? - ANSWERSome of a blended refrigerant evaporat...

The acronym HVAC is used for the heating, ___________, and air conditioning system. (p) 720 - ANSWERVentilation The component that allows pressure to increase in the cooling system is the: (p) 722 - ANSWERRadiator cap A stuck open_________ can cause poor heater performance. (p) 726 - ANSWE...

List at least five factors that must be controlled if a comfortable indoor environment is to be maintained. -ANSWERThe factors that must be controlled include temperature, humidity, air motion, dust, bacteria, odors, toxic gases, and ionization. ((Ref: 1/1)) Describe in simple terms the basic ...

Two technicians are discussing heat movement. Technician A says that heat is a form of energy. Technician B says that heat travels from hot to cold. Which technician is correct? - ANSWERBoth techs In addition to cooling the passenger compartment, an air conditioning system ________. heats passen...

What are the different sources of air for air conditioning and pressurization? A) Engine bleed air and recirculated air (only on ground) B) Engine bleed air and recirculated air. C) Engine bleed air and recirculated air, or if selected, APU bleed air and recirculated air. D) Engine bleed air ...

When topping off an operating system containing a blended refrigerant - ANSWERintroduce the refrigerant as a liquid into the low side using a throttling valve A partially clogged capillary tube can cause - ANSWERa starved evaporator The R134a high pressure gauge reads 146 PSIG and the liquid l...

What us the 2nd law of thermodynamics? - ANSWERHeat travels from hot to cold (high to low) temp What's the first law of thermodynamics? - ANSWEREnergy cant be created or destroyed Hermetic compressor are cooled by? - ANSWERSuperheated refrigerant vapor (cool gas) Radiant heat travels - ANS...

T or F? The electrical cords for domestic refrigerators are insulated to withstand twice their normal voltage. - ANSWERTrue Most compressors used in domestic refrigerators use _____________ motors. - ANSWERSplit-Phase T or F? During startup, a motor may draw an overload of current that may amo...

If a heat pump works normally in the heating mode but will not provide cooling or defrost mode, which component is most likely defective? - ANSWERReversing valve Air-to-air heat pumps produce heat by - ANSWERextracting heat from the outdoor air and transferring it to the indoor air In addition...

Which of the following statements about unitary air-conditioning systems is true? - ANSWERThey may be split systems with an indoor unit and a matching outdoor unit Which of the following statements about field-erected air-conditioning systems is false? - ANSWERThe fan and compressor are inside th...

What are two types of air conditioning systems that may be installed on an aircraft? - ANSWERAir-cycle systems and vapor-cycle systems How is the heat removed from an aircraft cabin with a vapor-cycle air conditioning system? - ANSWERThe cabin heat is absorbed by the refrigerant in the evaporator...

Technician A says that an overcharged AC system can cause excessive compressor noise. Technician B says that an undercharged AC system can cause excessive A/C clutch engagement/disengagement. Who is right? A. A only B. B only C. Both A and B D. Neither A nor B - ANSWERCorrect Answer: C Te...

A customer complains that the heater works sometimes, but sometimes only cold air comes out while driving. Technician A says that the water pump is defective. Technician B says that the cooling system could be low on coolant. Who is right? A) Technician A only B) Technician B only C) Both tec...

1. Which of the following occupations is part of the Design/Preconstruction career pathway? - ANSWERHVACR (mechanical) drafter 2. Installing refrigeration units on the roof of a new grocery store would be completed by someone in an occupation found in the _ pathway. - ANSWERconstruction 3. W...

Two technicians are discussing air plenums. Technician A says air passes through the evaporator first then to the heater core. Technician B says vacuum, cable, and electric motors are all ways to control air plenum door operation. Who is correct? - ANSWERBoth Technician A and B Two technicians ar...

Using steel piping in a refrigeration systems that use ammonia will prevent? - ANSWERCorrosion What characteristics must a refrigerant have if it as used as a drop in replacement for another refrigerant ? - ANSWERSimilar operating pressures and temperatures. What is commonly done when a drop i...