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