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Offers solutions and expertise in servicing, repairing, and maintaining refrigeration systems to ensure performance and efficiency in various industries.
The instrument used to find refrigerant leaks in a general area is called ___.
The four most important components in a refrigeration system are:
If a high temperature evaporator is forming ice, which of the following is apossible problem?
Latent heat is ___.
What is the definition of sub-cooling?
Which type of compressors use crankshaft seal?
The refrigerant in the evaporator must be colder than the air passing over it for heat to transfer to the evaporator.
A normally operating water-cooled condenser is operating with a 10°differential between water in and water out. If the amount of 85°F water going through thecondenser is reduced, which of the following is a possible temperature of the water leaving thecondenser?
An evaporator made up of two or more pieces of sheet metal dimpled to create tubes is called a ____type.
The instrument used to measure current is called ___.
What is the most common metering device used in domestic refrigerators?
What is the definition of a BTU?
An evaporative condenser uses ____ and ____ as the transfer medium for system heat.
___ is a unit of electric current.
Moisture in the system will result in
Which color cylinder designates R-22?
The state of the refrigerant entering the compressor is ___.
What is the definition of super heat?
Loose or dirty connection on a fan motor can cause ___.
Compressor, fan and pump motors should be regularly cleaned to___.
The capacity of an evaporator is affected by ____.
The instrument used to measure ohms is called ___.
In a refrigerator that has capillary tube, what controls the box temperature?
Refrigerant entering the evaporator is approximately ____% liquid.
At what temperature does sil-flux melt?
Why is it that workers must wear goggles when operating a power grinder?
When the quantity of refrigerant flow to an evaporator is reduced, the amount of superheat in the vapor leaving the coil will ____.
Which of the following can be used to maintain the head pressure of a systemwith an air-cooled condenser?
In a water-cooled condenser, the leaving water temperature is normally ____°F lower than the condensing temperature of the refrigerant.
A refrigeration system designed for the storage of flowers or candy isconsidered a ____ type.
Which of the following is NOT part of the low side of the system?
What force causes a thermal-electric expansion valve to open?
What instrument is used to measure voltage?
Automatic expansion valve usually adjusts the ___.
A hermetic system is a ___
Refrigerant fluids are ___.
In a water-cooled condenser with dirty condenser tubes, the temperaturedifference between the refrigerant and the leaving water will be ____ when the tubes areclean.
If an R-12 refrigeration system is operating with a 25.4 psig suction pressure,what is the evaporator superheat if the evaporator outlet temperature is 34°F?
A compressor motor may be operated by ___.
A direct expansion-type evaporator is also called a ____.
What control determines the refrigerator cabinet temperature?
Why is it necessary to be cautious when handling contaminated refrigerant oil?
Front seating the suction service valve will close the ___.
Heat may be transferred from one body to another by ___.
Where are piercing valves installed?
Excess evaporator superheat ____.
How many different refrigerants may be recovered into the same cylinder?
What instrument is used to measure the temperature?
A typical superheat for an evaporator operating under normal conditions would be____.
The device that changes low pressure vapor to high pressure is called?
Hard starting may also occur in a low ambient conditions causing low head pressures.
When the velocity of the air moving over an evaporator is slow, the "air film" acts as an insulator and slow the rate of heat exchange.
When should you install a new liquid line filter drier?
What leaves the refrigerant system when you purge the lines?
Sensible heat is ___.
Which of the following is an HFC refrigerant?
Refrigerants can be mixed in the recovery cylinder.
When evacuating a refrigeration system, the vacuum pump should be able to pull
Normal mid-temp refrigeration temperature is approximately __ degrees.
Which color cyliner designates R-134a?
The device that changes liquid to vapor is called?
___ is a unit of capacitance.
As the evaporator load increases, an automatic expansion valve will ____ to reduce the evaporator pressure while a thermostatic expansion valve will ____ to reduce the evaporator superheat.
The device used to feed refrigerant to multiple circuits in an evaporator is called a flow circuit.
In order for a flooded condenser type head pressure control system to operate, a device called a ____ has to be added to the system because of the extra refrigerant.
SEER is calculated based on the total amount of ____ the system will provide over the entire season, divided by the total number ____it will consume.
A typical evaporator operating temperature in an air-conditioning system is____.
Mineral deposits in the water portion of a water-cooled condenser act as____.
After installing a new compressor, the unit should first be
A large capacity evaporator would probably have ____.
The start capacitor is connected in ___ with the start winding.
At what temperature does 95/5 soft solder melt?
In a water-cooled condenser, a regulating valve is used to control the____.
Heat flows in what direction?
In most cases, the refrigerant leaving the evaporator must be ____ percent vapor.
Evaporating pressure must be ___ so the liquid boils at the correct temperature.
Why do most domestic refrigerators have a defrost system?
If a spring pressure of a water regulating valve is increased, the system head pressure will also increase.
When brazing a discharge filter-drier, you should always
Non-condensibles in a refrigeration system will result in
If the waterflow is reduced, the temperature difference across a condenser will____.
___ is a unit of electrical power.
The condenser in a refrigeration system ____.
If an evaporator has a pressure drop of 10 psig and the low side pressure is 15psig, what is the pressure at the inlet of the evaporator?
The low form of plant life that grows in condenser water is ____.
A water regulating valve helps maintain in a system's head pressure by modulating the flow of refrigerant through the condenser.
What does the sight glass in the liquid line frequently indicate?
Which of the following is an HCFC refrigerant?
Refrigeration contaminants are removed by ___.
Every central split cooling system manufactured in the USA today must have a Seasonal Energy Efficiency Ratio (Seer) of at least 10.
Low suction pressures, iced coils, short-cycling, and inefficient cooling can also result from low head pressures.
In an AEV or AXV system, when does the needle valve open?
If an R-12 refrigeration system has its air-cooled condensing unit on a100°F roof and the condenser outlet temperature (refrigerant) is 115°F, with how muchsubcooling is the condenser operating?
The water circuit in shell and coil and coil-type tube-in-a-tube condensers mustbe cleaned ____.
Blended refrigerant leak from a system ___.
How many electrical terminals does a hermetic compressor motor have?
Which of the following refrigerants are not CFCs?
What is the purpose of an oil separator?
What can be used to maintain the head pressure of a system with a water-cooledcondenser?
In a hot gas defrost system, which part of the system is heated?
A forced draft medium temperature evaporator would ____.
Identify the starting relay or relays used on hermetic compressors
What trouble may be an indication from a warm suction line?
The shell and tube condenser is cleaned ____.
Ice formation on an evaporator is controlled by ___.
Bimetal switches will open if ___.
At what temperature does silver solder melt?
The two pressures that push to close a thermostatic expansion valve are the ____ pressure and the ____ pressure.
Why are expansion valves adjustable?
Which of the following is a refrigerant blend?
The automatic expansion valve maintains a constant ____.
If an air-cooled condenser's fan motor stops running, the heat pressure will ____ and the amount of subcooling will ____.
It is said that most accidents are being caused by
Control of the head pressure in an air-cooled condenser is done by ____.
If the suction line is frosted, the trouble could be ___.
Which of the following would allow a system to operate more efficiently?
Which of the following illustrates the principle of convection?
___ is a unit of electromotive force.
A forced draft high temperature evaporator would ____.
What is the common color used for ground wire?
During the defrost cycle of a forced draft low temperature evaporator, the evaporator fan would ____.
Fewer fins per inch on an evaporator allow more ice to build between defrost cycle.
Which of the following condensers is the most efficient?
As a rule of thumb, the temperature of the evaporator should be about ____ °F colder than the box temperature.
Refrigeration service valve wrench is used to __.
If a low temperature evaporator is forming excess ice, which of the followingcould be a possible problem?
Why should refrigerant cylniders be filled to only 80% or capacity?
When a system with a water-cooled condenser cycles off, the water regulatingvalve should ____.
A stamped plate evaporator usually does not use a fan to move air across it.
Back seating the suction service valve will close the ___.
What refrigerant have the greatest negative effect on the ozone?
What kind of compressor motor control is used on household freezers?
Thermistors are used in refrigeration work ___.
The desired water flow through a condenser connecting to a recirculating water system is 3 gallons per minute.
High head pressures from low ambients can cause insufficient refrigerant flow rates through metering devices, which in turn starve evaporators.
Refrigerant in a system should be disposed of by ___.
What type of valve is used to reverse the flow of refrigerant in a heat pump?
A gauge manifold includes a ___.
If the application requires a coil design to operate below 32°F, there mustbe provision for ____.
One large problem designer's face when designing air-cooled refrigeration and air conditioning equipment is a changing ambient from the changing seasons.
When should you push and pull on a wrench?
If a low temperature evaporator is forming ice, which of the following is apossible problem?
The TX valve maintains a constant ____.
Evaporative condensers operate more efficiently in climates where the wet bulb temperature is a great deal lower than the dry bulb temperature.
The component that changes the low-pressure vapor to a high-pressure vapor is ___.
In the TEV or TXV system, when does the needle valve open?
The correct term for a coil using a low side float is ____.
Condensing temperatures in an air-cooled condensing unit can be reduced by____.
What is the purpose of a sight glass on a compressor?
The two primary functions of an evaporator are to remove ____ and ____ from the refrigerated space.
When brazing a suction line using sil-flux, you should
What indicates that correct brazing temperature has been reached?
To test for shorts or grounds on the motor windings, use an ___.
What could cause a compressor motor to burnout?
What force causes the solenoid valve to open?
A defrost system that pipes the compressor discharge vapor directly to the evaporator is called a ____ type.
Heat is absorbed by evaporating a liquid refrigerant in the ___.
The heat required for off-cycle defrost is obtained from ____.
What is the advantage of a water-cooled condenser?
What is the purpose of a ladder diagram?
An air-cooled condenser that is operating in a climate that has four distinctseasons must ____.
What indicates an electrical failure in a door mullion heater?
A normally operating water-cooled condenser is operating with a 10°differential between water in and water out. If scale forms on the water tubes and the entering wateris 85°F, which of the following is possible?
Why do some technicians use the reamer to clean the end of the copper tubing?
When using nitrogen, the nitrogen tank must be equipped with ___.
In a compression refrigerator, oil buildup can cause a problem in the ___
The refrigerant in a condenser in a refrigeration system ____.
What do we use to pinpoint a refrigerant leak in the system?
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