The three common states of matter are
What is the purpose of air conditioning?
Two materials that are considered good thermal conductors are
What material is used for refrigerant piping heating, air...
The chemical components of CFC refrigerants are
The preferred method of cutting copper tubing for a refrigeration...
What gases are safe to use for refrigerant system pressure testing?
The chemical components of HCFC refrigerants are
In the United States, the cooling capacity of air conditioning...
Which of the following metering devices can respond to changes in...
When should you reqd a product's safety Data Sheet (SDS)?
What is the purpose of adding fins on the tubing used for heat...
Contaminants that can be found in recovered refrigerant include
Why do some commercial buildings need air conditioning in the winter?
The three basic types of condensers used with HVAC/R systems are
What material is used for air conditioning drain lines?
Matter is defined as
The preferred tool for cutting PVC pipe is
The three basic methods of heat transfer are
Refrigerant piping must be able to adequately carry both refrigerant...
The four major components of the compression refrigeration cycle in...
Two types of fixed metering devices are
Who developed the first modern air conditioning system?
What temperature scale uses 0o as the freezing point of water and...
The purpose of the condenser in a refrigeration system is to
A mechanical refrigeration system cools a room by
A metal rod is heated on one end and heat travels from that end to the...
Campers being heated by a fire outside is an example of
The fins on finned tube coils increase heat transfer by
What are the chemical components of HFC refrigerant?
The first law of thermodynamics states that
New residential air conditioning systems now primarily use
What units are used to measure pressure in HVAC/R systems in the...
Why are copper fittings cleaned before soldering or brazing?
Besides improving efficiency, insulating the suction line:
A device used to evenly distribute mixtures of liquid and vapor...
Explain how a non-toxic, nonflammable refrigerant can be dangerous.
What is the main purpose of the fins on finned tube evaporators?
What is the purpose of flux?
What physical change of state is the opposite of evaporation?
A general definition of refrigerant is
Why is a large refrigerant leak potentially dangerous?
Which statement accurately describes heat flow between two objects?
The purpose of subcooling the liquid refrigerant is to
The difference between a liquid receiver and a suction accumulator is...
Which type of ladders are safest to use in any working conditions?
The refrigeration system component that absorbs heat out of the...
When gas exerts pressure on its container, the pressure is
Water vapor in the air condenses on the evaporator coil
What is an absolute temperature scale?
Why is it illegal to operate a torch with an acetylene pressure...
The heat rejected by the condenser
Small appliances such as household refrigerators and freezers now...
A compressor that squeezes gas in between the piston and a valve plate...
How many watts equal one horsepower of work?
Atmospheric pressure is created by
A compressor that uses a high speed impeller to throw the refrigerant...
Tube in tube, shell and coil, and shell and tube are all different...
All refrigeration compressors are designed to pump
What is the purpose of SDS sheets?
The chemical in CFCs that contributes to ozone depletion is
The pointer on a dial type thermometer is moved by a
Why are acetylene cylinders only used in the upright position?
An advantage of open drive compressors is that
The law of conservation of matter states that
Which type of condenser requires the most maintenance?
What units are used to measure vacuum?
Soft copper tubing can be joined by
Which one do you like?
Hydraulic pressures will develop and break compressor parts if
A compressor that squeezes gas between two rotating screws shaped like...
Why is it dangerous to use gauges only designed for R22 on a R410A...
Copper tubing that comes in rigid, straight lengths is called
The match of the motor and compressor inside a hermetic compressor
The purpose of the trap in a condensate drain is to
What equipment should always be used when using nitrogen?
What type of compressors contain the compressor and motor together...
How does pressure affect the boiling temperature of a liquid
Optional components found on the low side of a refrigeration system...
The second law of thermodynamics states that
Refrigerants absorb heat
What units are most commonly used to measure heat quantity in the...
Most materials that are good electrical conductors
Refrigerants release heat
What is the relationship between atoms and molecules?
The difference between brazing and soldering is that
What happens to the temperature of boiling water once it starts to...
Optional components on the high side of a refrigeration system include
Refrigerant leaves the metering device
The rate of heat transfer is faster if
Air conditioning window units for homes were first available in
If a gas with a specific gravity of 1.3 is released in a room, will it...
The presence of non-condensables in a refrigerant recovery cylinder...
The curved oval metal tube inside a gauge is called
If the refrigerant is recovered improperly from a water cooled...
Pressure is defined as
What is the ICE exam?
The air circulating inside a refrigerator is an example of
The temperature of the water formed by melting ice is
Ozone is an oxygen molecule formed with
Refrigerants with the highest ozone depletion potential are
Capillary tube metering devices are commonly used today in
Above what temperature do most refrigerant oils begin to fail?
The refrigerant in a mechanical compression refrigeration system...
A heat process that causes a substance to change state is called
As refrigerant passes through the metering device it
Calculate the amount of heat required to change 5 lbs of 32o ice...
Which type of condenser generally operates with a lower discharge...
The primary cause of high condensing temperatures in water cooled...
When a liquid boils
The two general categories of metering devices are
The standard industry number designation for each refrigerant is...
How many BTUs will a 10-kilowatt heater produce if operated for an...
When can a saturation pressure-temperature chart be used to accurately...
What classification would a 100,000 Btuh furnace most likely be?
In the compression refrigeration cycle the refrigerant is superheated
How can a thermocouple tip be used to get an accurate line temperature...
A compressor that uses a roller that rotates in an orbital motion to...
A compressor crankcase heater is used to
The absolute temperature scale for Celsius is
The major types of compressors listed by mechanical design are
Define a vacuum.
The temperature difference between the bubble point and the dew point...
Why is it recommended that an acetylene cylinder valve never be opened...
What is the primary difference between air cooled condensers on...
What measurements are necessary for a test instrument to measure...
Why does the compression refrigeration cycle have a high pressure side...
How does a fluorescent dye leak detector work?
What components in a compression refrigeration system maintains the...
What opens and closes the valves in a reciprocating compressors?
Heat flows from the product into the evaporator because
Which of the following modifications would need to be made in a...
The major safety concern with R-410A is that
Convert 55 psig to absolute pressure.
What are the two most common sizes of acetylene cylinders used in the...
The separation of the refrigerant components in a zeotropic...
In the compression refrigeration cycle the refrigerant is subcooled
In the compression refrigeration cycle the refrigerant is saturated
At what point in the refrigeration cycle does the refrigerant lose the...
A compressor which compresses gas between a fixed spiral and an...
Calculate the amount of heat required to change 5 pounds of...
The heat balance in a compression cycle refrigeration system can be...
Why are vertical suction risers often smaller than the horizontal runs...
What is the purpose of annealing copper tubing?
One operating advantage of fixed restriction metering devices over...
What is absolute 0?
A heat process that causes a change in a substance's temperature...
What is the maximum reading on a typical R410A high pressure gauge?
Sensible cooling
Oil accumulation in the evaporator:
The definition of a fluid is
The refrigerant inside most refrigerant cylinders is a
A low pressure refrigerant has a pressure at the reference saturation...
The halogen family of chemicals includes
Three forms of energy used in heating and air conditioning include
How does an ultrasonic type leak detector work?
The function of the compressor in the refrigeration cycle is
At what point in the refrigeration cycle does the refrigerant absorb...
What kinds of pressures are expressed in inches of water column?
To increase latent cooling capacity
How many BTUs are required to raise the temperature of 15 pounds of...
Examples of halogenated refrigerants include
Why are wastewater systems no longer allowed in some areas of the...
The temperature of a boiling liquid
Which of the following refrigerant safety designations indicate the...
A hydroscopic lubricant
What is the purpose of low ambient controls for air cooled condensers?
What is the maximum reading on a typical R22 high pressure gauge?
Oversized suction lines:
The substance being cooled by a refrigeration system is called
What is the purpose of the Refrigeration Service Engineer's...
Hard copper tubing can be joined by
An air conditioner with refrigerant R-22 has a low side pressure of 70...
The shaft seal on a open compressor is more complicated than the...
Fan cycling, fan speed control, damper control, and condenser flooding...
Types of copper tubing in order of wall thickness from light to heavy...
Zeotropes are mixtures of two or more refrigerants
What advantages do orifice type metering devices have over capillary...
An evaporator in which refrigerant enters as a saturated liquid vapor...
What is the AHRI "A" performance testing condition for air...
The operation of a thermostatic expansion valve can best be described...
What units are most commonly used to measure heat intensity in the...
Liquid lines need to be insulated:
Assuming they both have the same condenser temperature, which...
Rotary compressors are commonly used in
A high pressure refrigerant has a pressure at the reference saturation...
Compressor cylinder unloading reduces the capacity of a reciprocating...
Which of the following refrigerant safety designations indicate the...
Azeotropes are mixtures of two refrigerants
An air conditioner with refrigerant R-410a has a high side pressure of...
Latent cooling
What procedure is used when heating a brazed copper joint?
Which saturation temperature is used to determine refrigerant...
Flash gas in the liquid line can be identified by:
A compressor with a suction pressure of 120 psig and a discharge...
What is the maximum reading (including retard) on a typical R22...
What is the maximum reading (including retard) on a typical R410A...
When the hand wheels on the gauge manifold are turned counter...
The absolute temperature scale for Fahrenheit is
Refrigeration oils must be miscible with the system refrigerant...